BERNINA L 850

The ultimate Overlocker

One-step BERNINA Air Threader
Extremely fast, precise and quiet
Convenient freearm
Total Stitch Control for perfect seams
Grand sewing space

Overview
Image Gallery
Features & Functions
Accessories
Tutorials
Support

BERNINA L 850 – A true masterpiece among sergers

Our Swiss engineers have created a masterpiece, which allows you to thread the machine even faster and more conveniently. Simply press the foot control and you're off!

"The ultimate overlocker" Andrea Müller about the BERNINA L 850

"The ultimate overlocker."Andrea Müller, Textile Designer „Jolijou"

As the designer of the brand “Jolijou”, Andrea Müller creates colorful jersey fabrics and loves bringing them to life in new projects using the BERNINA L 850 overlocker. In particular, the One-step BERNINA Air Threader and the fast sewing speed with perfect stitch quality win this mother of three’s admiration when projects have to be done on a limited schedule.

Watch Video

The One-step BERNINA Air Threader

Simple threading with air
Now, you're ready to sew
Imaging threading that is actually fun

The looper threads are magically moved through the machine by air with one simple step on the foot control. Now both hands are free to guide the threads. The L 850 automatically sets the loopers in the correct position of the air threader – no turning the handwheel or searching for the right position.

Sew in comfort

Raise and lower presser foot easily
Both hands free to guide the fabric
Easy access to the needles thanks to presser foot that swings out

With the BERNINA Free Hand System (FHS) you can raise and lower the presser foot with your knee. In addition, the presser foot easily swings out for convenient access to the needles.

Total Stitch Control for perfect seams

Individually adjustable settings for Total Stitch Control
Perfect for working with various fabrics and threads in any combination
Fully adjustable differential feed

The L 850 offers several settings for Total Stitch Control - all individually adjustable. The best part? You can change all of these settings while sewing - including the thread tension, cutting width, stitch length and Micro Thread Control (mtc).

Extremely fast, precise & quiet

Sew up to 1,500 stitches per minute
Strong, consistent and precise at any speed
Extremely quiet

Not only can you sew quickly, but you can also sew stitch-by-stitch, making the flawless production of precise lines and curves a simple process. Plus, you will enjoy how extremely quiet the BERNINA L 850 sews.

Quick threading

One-path, color-coded threading
Automatic Needle stop up function
Integrated Needle Threader

The integrated Needle Threader and automatic needle stop up function make threading the needles simple. You can easily change from an overlock seam to a rolled hem or flatlock seam in no time because the thread remains in the same threading path.

Grand sewing space

5 5/8" right to the needle
Easy on/off extension table included
Convenient freearm

The space offered on the L 850 is generous by any definition. It has more room to the right of the needle and more work space height than any other BERNINA serger. Sew closed items with ease by simply sliding sleeves or cuffs over the convenient freearm.

Get a feel for this fantastic machine

Get a better feel for this incredible machine. Simply click the button below and you will see every stunning angle of the BERNINA L 850.

Take a spin

Try the BERNINA L 850 yourself

Sign up now for a test drive and convince yourself of what makes the BERNINA L 850 so special. Your local dealer will be happy to assist you and to answer all your questions.

Explore the BERNINA L 850

Features & Functions

Overview
Stitch Variations
Technical Specifications
Comfort Features

Note:
Not all models and accessories are available in all countries. We reserve the right to make changes in both features and design.

Stitches	18
Stitches A variety of wide and narrow, long and short stitches for all your sewing projects.
Overlock Stitch Width
Overlock Stitch Width The Overlock Stitch Width is adjustable to suit any fabric type and sewing technique. Wide stitches are suitable to sew and neaten medium to heavy weight fabrics, narrower stitches for medium to light weight and fine fabrics.
Micro Thread Control (mtc)
Micro Thread Control (mtc) With Micro Thread Control, the over-edge thread length can be set directly resulting in the perfect seam with one quick adjustment.
One-Step BERNINA Air Threader (for looper threads)
One-Step BERNINA Air Threader (for looper threads) Automatically threads the loopers. The One-step BERNINA Air Threader is activated with the BERNINA Foot Control, so both hands remain free to hold the thread over the Air Threader Nozzles.
Built-in Needle Threader
Built-in Needle Threader The Built-in Needle Threader located at the needle bar area easily switches to thread the needles.
Swing-out Presser Foot with Auto Swing Back
Swing-out Presser Foot with Auto Swing Back The Presser Foot swings to the left, providing ample space for easy threading, comfortable needle changing and to easily lay the threads under the Presser Foot. When lowering the presser foot with the hand lifter it swings automatically back.
Freearm
Freearm Freearm for easy sewing of tubular projects such as cuffs, legs and necklines.
BERNINA Free Hand System (FHS) with Knee Lifter
BERNINA Free Hand System (FHS) with Knee Lifter Use the knee-operated lever to lower or temporarily raise the Presser Foot allowing your hands to manage your project at all times.
Automatic Needle Stop Up
Automatic Needle Stop Up The needle always stops in the highest position at the end of each stitch. Ideal to thread the needles, position or remove the sewing project.
Easy to Engage and Disengage Knife from Outside
Easy to Engage and Disengage Knife from Outside The Knife On/Off Lever is positioned on the outside of the machine. The upper knife is quickly disengaged with one finger when opting not to trim. It is also easily accessible while sewing.
Sewing speed, stitches per minute	1500

Product brochure – All information at a glance

Download now

Note:
Not all models and accessories are available in all countries. We reserve the right to make changes in both features and design.

Stitches	18
Stitches A variety of wide and narrow, long and short stitches for all your sewing projects.
4-Thread Overlock with Integrated Safety Seam	1
4-Thread Overlock with Integrated Safety Seam The 4-Thread Overlock is a sturdy and strong stitch, most often used for durable and elastic seams in knits and stretchy fabrics. It is suitable for apparel, especially for sportswear, and home textiles.
3-Thread Super Stretch Stitch	1
3-Thread Super Stretch Stitch The 3-Thread Super Stretch Stitch creates overlock seams for super stretchy and two-way-stretch fabrics used for gymnastic or swimwear. An especially soft stitch, ideal for lingerie and gymnastic wear, is achieved by using a texturized nylon thread in the looper (and needles). Decorative threads are used to neaten and create reversible edges.
3-Thread Overlock Wide (LN)	2
3-Thread Overlock Wide (LN) The 3-Thread Overlock is a balanced seam and also ideal for neatening edges, hems and facings, quicksewn edge finishing and effect seams. Wide 3-Thread Overlock is suitable for strong woven fabrics, pile, furry materials or sturdy knits, for garments and decorative projects.
3-Thread Overlock Narrow (RN)	2
3-Thread Overlock Narrow (RN) The 3-Thread Overlock is a balanced seam and also ideal for neatening edges, hems and facings, quicksewn edge finishing and effect seams. Narrow 3-Thread Overlock is suitable for fine to medium weight fabric neatening, t-shirts, children's garments, lingerie and fine home textiles.
3-Thread Flatlock Wide (LN)	2
3-Thread Flatlock Wide (LN) The 3-Thread Flatlock is a flat, slightly stretchy seam that is sewn on the right side of the fabric and is especially ideal for creative overlock projects in combination with decorative threads. The wrong side of the stitch is known as "ladder stitch" and also used for decorations or base to weave tape or cord into the stitch. A wide 3-Thread Flatlock is used in medium to heavy weight fabrics. Suitable for patchwork, apparel and sportswear and home textiles
3-Thread Flatlock Narrow (RN)	2
3-Thread Flatlock Narrow (RN) The 3-Thread Flatlock is a flat, slightly stretchy seam that is sewn on the right side of the fabric and is especially ideal for creative overlock projects in combination with decorative threads. The wrong side of the stitch is known as "ladder stitch" and also used for decorations or as a base to weave tape or cord into the stitch. A narrow 3-Thread Flatlock is used in medium to light weight fabrics. Suitable for patchwork, apparel, sportswear, lingerie and home textiles.
3-Thread Narrow Seam	1
3-Thread Narrow Seam The 3-Thread Narrow Seam is used for fine fabrics or see-through materials like silk, cotton or synthetic fabrics. It can be used for pintucks in heirloom projects and as a decorative fine edge finish, e.g. with two different shades of embroidery thread in the loopers. Suitable for inserting lace, light weight apparel, blouses, children's garments, accessories.
3-Thread Rolled Hem	1
3-Thread Rolled Hem A rolled hem is an attractive and quickly sewn decorative edge finish, for example with embroidery thread in the loopers. The rolled hem can also be used for pintucks in heirloom projects. Suitable for accessories, ruffles, light weight outerwear, home textiles.
3-Thread Picotstitch	1
3-Thread Picotstitch The 3-Thread Picotstitch is an attractive and quickly sewn edge for light weight woven and knitted fabrics. Suitable for scarfs, bridal wear and ruffles, home textiles and decorative craft projects.

Product brochure – All information at a glance

Download now

2-Thread Wrapped Overlock Wide (LN)	2
2-Thread Wrapped Overlock Wide (LN) The 2-Thread Wrapped Overlock is a reversible stitch, ideal for neatening single layers of fabric, seams, hems and facings or as a decorative element with woven or fleecy fabrics or firm knits. The wide stitch is suitable for medium weight to heavy weight fabrics and threads.
2-Thread Wrapped Overlock Narrow (RN)	2
2-Thread Wrapped Overlock Narrow (RN) The 2-Thread Wrapped Overlock is a reversible stitch, ideal for neatening single layers of fabric, seams, hems and facings or as a decorative element with woven or fleecy fabrics or firm knits. The narrow stitch is suitable for medium weight to light weight fabrics and medium weight to finer threads.
2-Thread Flatlock Wide (LN)	2
2-Thread Flatlock Wide (LN) The 2-Thread Flatlock is a highly stretchy and flat stitch, often used with decorative threads or texturized nylon thread for lingerie, swimwear and gymnastic wear. The wide stitch is suitable for medium to heavy weight woven and knitted fabrics, patchwork, apparel and craft projects.
2-Thread Flatlock Narrow (RN)	2
2-Thread Flatlock Narrow (RN) The 2-Thread Flatlock is a highly stretchy and flat stitch, often used with decorative threads or texturized nylon thread for lingerie, swimwear and gymnastic wear. The narrow stitch is suitable for medium to light weight woven and knitted fabrics, patchwork, apparel and craft projects.
2-Thread Rolled Hem	1
2-Thread Rolled Hem With rolled hems, achieve fine edge finishing on hems, ruffles and flounces, ideal for bridal wear, or lingerie. With Differential Feed, stretching, it is often used as lettuce edge finish in knits.
2-Thread Overlock Wide (LN)	2
2-Thread Overlock Wide (LN) The 2-Thread Overlock is ideal for neatening fine single layers of fabric and ensures no seam puckering. The wide stitch is suitable also for heavier weight but loosely woven fabric neatening with texturized nylon or universal thread, use for apparel or home textiles.
2-Thread Overlock Narrow (RN)	2
2-Thread Overlock Narrow (RN) The 2-Thread Overlock is ideal for neatening fine single layers of fabric and ensures no seam puckering. The narrow stitch is ideal for finest silk and batiste or knitted fabrics to be neatened with fine texturized nylon or fine threads, for apparel or home textiles.
2-Thread Blanketstitch Wide (LN)	2
2-Thread Blanketstitch Wide (LN) The 2-Thread Blanketstitch is used on ready-made blankets or on heavier fabrics with longer stitch and maybe more cutting width and with decorative threads in needle and looper. Suitable for medium to heavy weight fabrics and knits, pile and furry material, decorative finishing on apparel, coats, jackets and home textiles.
2-Thread Blanketstitch Narrow (RN)	2
2-Thread Blanketstitch Narrow (RN) The 2-Thread Blanketstitch is used on ready-made blankets or on heavier fabrics with longer stitch and maybe more cutting width and with decorative threads in needle and looper. Suitable for medium weight and soft fabrics and knits, pile and furry material, decorative finishing on apparel, coats, jackets and home textiles.
Overlock Stitch Width
Overlock Stitch Width The Overlock Stitch Width is adjustable to suit any fabric type and sewing technique. Wide stitches are suitable to sew and neaten medium to heavy weight fabrics, narrower stitches for medium to light weight and fine fabrics.

Motor	DC
Motor The DC Motor with BERNINA Foot Control enables slow and steady sewing, even Stitch-by-Stitch sewing or half stitch sewing (needle up/down). The AC motor is the industry standard and allows continously variable sewing speed with the Foot Control.
Sewing speed, stitches per minute	1500

Product brochure – All information at a glance

Download now

6-step presser foot pressure
6-step presser foot pressure Presser foot pressure is adjustable to accommodate sheer to thick fabrics.
Weight of machine	27.1 lb

Stitch Selection with Stitch Chart
Stitch Selection with Stitch Chart Select a stitch from the stitch chart, set the machine accordingly before threading accordingly.
Total Stitch Control
Total Stitch Control Individually adjustable settings such as Thread Tension for each Needle and Looper, Stitch Length, Differential Feed, Cutting Width, Micro Thread Control, Presser Foot Pressure, and Rolled Hem settings allow for perfecting stitches when using a wide variety of fabrics and thread combinations.
Thread Tension Adjustment
Thread Tension Adjustment Infinitely variable and easily adjustable, the Thread Tension Dials ensure quick and accurate set-up for all projects.
Stitch Length Adjustment	0.8–4.5 mm
Stitch Length Adjustment With a variable, easily accessible, numbered dial on the exterior of the machine, stitch length can be adjusted, even while sewing.
Stitch Length Fine Adjustment for Rolled Hem
Stitch Length Fine Adjustment for Rolled Hem The Stitch Length Adjustment between 0.8 and 1.5 is very fine, so that rolled hems can be fine-tuned in delicate fabrics for the perfect match of fabric and thread.
Differential Feed Adjustment
Differential Feed Adjustment Differential Feed ensures wave-free seams in knits and prevents puckering in fine fabrics, while allowing deliberate gathering as an option. With an easily accessible dial outside right, adjustments to the fabric feed can be made even while sewing
Cutting Width
Cutting Width The Cutting Width Dial on the front of the machine can be adjusted to accurately set up seam width, and is adjustable even while sewing
Micro Thread Control (mtc)
Micro Thread Control (mtc) With Micro Thread Control, the over-edge thread length can be set directly resulting in the perfect seam with one quick adjustment.
Rolled Hem Selection Lever
Rolled Hem Selection Lever The Rolled Hem Selection Lever is built in next to the Stitch Plate and eases switching to a Rolled Hem stitch and back to overlock by simply moving the Rolled Hem Selection Lever.
Stitch Finger Adjustable
Stitch Finger Adjustable The Stitch Finger supports the looper threads to build the stitch. It moves with the cutting width adjustment to hold more or less thread and can be fine-tuned using Micro Thread Control.
One-Step BERNINA Air Threader (for looper threads)
One-Step BERNINA Air Threader (for looper threads) Automatically threads the loopers. The One-step BERNINA Air Threader is activated with the BERNINA Foot Control, so both hands remain free to hold the thread over the Air Threader Nozzles.
Pulse Drive (L 850/L 860)
Pulse Drive When stepping on the BERNINA Foot Control with the Threader Cover and/or Looper Cover open, the machine will sew slowly for a maximum of one stitch, until the machine is in threading position.
Thread Feed Into Air Threader Nozzle
Thread Feed Into Air Threader Nozzle With closed BERNINA Air Threader pipes, the thread is pulled into the Air Threader as soon as the foot control is pressed. The thread tail needs only to hover above the nozzle to be pulled into the Air Threading System and into loopers. No need to place thread tail into nozzle for threading to occur properly.
Color-coded One-path Threading
Color-coded One-path Threading The thread follows one defined path for each stitch. The threading paths are always the same, and color coded.
Can be used with any sequence of threads
Can be used with any sequence of threads Thread in any order because the Looper Threads are in closed pipes that avoid unintentional tangling of needle and Looper Threads.
Threading Chart
Threading Chart A Color-coded Threading Chart is located inside the looper or threader cover. The threading path of each thread can be verified.
Stitch Diagram
Stitch Diagram The Stitch Diagram is ideally printed next to the Thread Tension Dial and eases verifying thread tension and threading path.
Built-in Needle Threader
Built-in Needle Threader The Built-in Needle Threader located at the needle bar area easily switches to thread the needles.
Needle Checking Window
Needle Checking Window This window on the Needle Bar provides for clear viewing of proper installation of needles.
Needle Screws Securing Plate
Needle Screws Securing Plate The Securing Plate ensures that unused screws will not get lost.
Thread Tension Release
Thread Tension Release As soon as the Presser Foot is lifted, the thread tension discs release automatically and allow easy, tension-free threading.
Swing-out Presser Foot with Auto Swing Back
Swing-out Presser Foot with Auto Swing Back The Presser Foot swings to the left, providing ample space for easy threading, comfortable needle changing and to easily lay the threads under the Presser Foot. When lowering the presser foot with the hand lifter it swings automatically back.

Product brochure – All information at a glance

Download now

Air Threader Circumvention
Air Threader Circumvention The advantage of bypassing part of the air pipes is to reduce friction, thus tension and a good sewing result can be achieved for longer and wider stitches.
Freearm
Freearm Freearm for easy sewing of tubular projects such as cuffs, legs and necklines.
BERNINA Free Hand System (FHS) with Knee Lifter
BERNINA Free Hand System (FHS) with Knee Lifter Use the knee-operated lever to lower or temporarily raise the Presser Foot allowing your hands to manage your project at all times.
Grand Sewing Space
Grand Sewing Space More space to the right of the needles offers comfort and more flexibility when stitching large and small projects. Ideal for handling from the right when the left hand is holding fabric and notions in place.
Space to the Right of the Needle	5 5/8"
Space to the Right of the Needle More space to the right of the needles offers comfort and more flexibility when stitching large and small projects. Ideal for handling from the right when the left hand is holding fabric and notions in place.
LED Sewing Light
LED Sewing Light LED Sewing Light illuminates the sewing and looper area making it easier to thread the needles and loopers. Eye strain is reduced while stitching projects in a brightly lit area.
Stitch-by-Stitch Sewing
Stitch-by-Stitch Sewing The DC Motor provides consistent needle penetration at any speed, from sewing fine single layer to heavy multi-layer fabrics. In particular, it also allows for slow, precise sewing.
Automatic Needle Stop Up
Automatic Needle Stop Up The needle always stops in the highest position at the end of each stitch. Ideal to thread the needles, position or remove the sewing project.
BERNINA Foot Control
BERNINA Foot Control Use the BERNINA Foot Control for accurate stitch-by-stitch precision and the benefit of needle up/down using the Foot Control with Back-kick function.
2-step Presser Foot Lifter
2-step Presser Foot Lifter The 2-Step Presser Foot Lifter provides additional clearance under the foot when placing multiple layers or bulky fabrics.
Thread Cutter
Thread Cutter The Thread Cutter with clamp function is conveniently positioned on the outside of the machine. It cuts thread chains and loose threads neatly. It holds the thread chain out of the way ready to start the next seam.
Integrated Upper Looper Converter
Integrated Upper Looper Converter Easily set up for applications without upper looper thread with the built-in Upper Looper Converter. To engage, flip to the left and insert into the looper eye. To disengage, push out of looper eye and flip to the right until it clicks into lowest position.
Accessories in Threader Cover
Accessories in Threader Cover Most important and frequently used tools are always at hand, ready to be used, no searching or wasting time.
Needle Pad
Needle Pad Needles that are not in use can be stored in the Needle Pad under the Threader Cover, always within easy reach.
Easy to Engage and Disengage Knife from Outside
Easy to Engage and Disengage Knife from Outside The Knife On/Off Lever is positioned on the outside of the machine. The upper knife is quickly disengaged with one finger when opting not to trim. It is also easily accessible while sewing.
Speed Selection Switch
Speed Selection Switch Sewing top speed can be reduced via the Speed Selection Switch to accommodate sewing projects that require slower but even sewing speed.
Safety Switch for Needle Threader
Safety Switch for Needle Threader Safety Switch to cut electrical supply to motor when Needle Threader is active.
Presser Foot Safety Switch
Presser Foot Safety Switch Safety Switch to cut electrical supply to motor when Presser Foot is lifted so the machine will not sew. Also when temporarily raising the Presser Foot with the Knee Lifter, the machine will not sew.
Safety Switch for Open Cover, Pulse Drive
Safety Switch for Open Cover, Pulse Drive Safety Switch to reduce sewing speed and activate Pulse Drive when Threader or Looper Cover is open. The machine sews slowly until it reaches the correct position for threading.
Carry Handle and Recessed Grip
Carry Handle and Recessed Grip Fold-down Carry Handle on top to the left of the threading path with additional Recessed Grip at lower right for stable carrying of the machine, even while threaded.
Knife Cover Insert
Knife Cover Insert The Knife Cover Insert is used with all overlock stitches with upper and lower looper, allowing to cut, sew and neaten. It guides the fabric trimmings smoothly into the Cut-offs Bin, while protecting your fingers in the knife area.
Workspace height	3 3/8"
Workspace height More overlocking space to the right of the needles offers comfort and more flexibility when stitching large and small projects. Allows for easy access to presser foot lifter and needles with the right hand. Ideal for handling from the right when the left hand is holding fabric and notions in place over the Freearm.

Accessories

Unleash your creativity with the included accessories and be prepared for any creative challenge with a huge variety of optional accessories.

Included
Compatible

Standard accessories BERNINA L 850

Here you will find an overview of the standard accessories for the BERNINA L 850.

LEARN MORE

Slide-on Table (L 8 Series)

The Slide-on Table is used to enlarge the sewing area to the left of the sewing area. It enables easier guidance of large fabrics and a better view of the sewing project.

LEARN MORE

BERNINA Tweezers

BERNINA Tweezers allow you to thread your overlocker with ease and remove any remaining pieces of thread from the machine.

LEARN MORE

Brush (L 8 Series)

This tool helps to remove dust and lint from the looper and stitch-plate area.

LEARN MORE

Screwdriver

Dieser Schraubendreher hat einen Durchmesser von 1,5 mm und verfügt über einen Sechskantkopf.

LEARN MORE

Spool Stabilizer for (L 8 Series)

The Spool Stabilizer prevents spools and cones of various sizes from vibrating at any sewing speed.

LEARN MORE

Overlocker Oil

Regular care ensures the flawless operation of the overlocker. Lubricating with this convenient Overlocker Oil is an important part of it.

LEARN MORE

Accessories Box (L 8 Series)

The large accessory box and the corresponding extension box provide storage space for L 8 Series presser feet and accessories.

LEARN MORE

Knee lifter/Free Hand System (FHS)

The Knee lifter/Free Hand System (FHS) lets you raise the presser foot with your knee. Especially recommended for delicate fabrics.

LEARN MORE

Cut-offs Bin (L 8 Series)

The Cut-offs Bin keeps the sewing table tidy. Simply click it on to the looper cover and dispose of fabric cut-offs immediately after cutting.

LEARN MORE

Right seam guide (L 8 Series)

The right seam guide helps to guide the fabric and ensures that it is cut evenly.

LEARN MORE

Needle Threader/inserter (L 8 Series)

The Needle Threader/inserter makes it easy to hold, insert or remove as well as thread overlocker needles.

LEARN MORE

Show all Hide all

Accessories for Overlocker

BERNINA Special accessories for overlocker let you equip your serger to your own individual requirements and apply creative techniques with flair and precision.

See all

Note:
Not all models and accessories are available in all countries. We reserve the right to make changes in both features and design.

Tutorials

Starting to sew
Threading
Seam variations
Stitch optimization
Machine Maintenance

BERNINA L 850 Overlocker/Serger: Getting Started

How to get started. How to attach or detach kneelifter, slide-on table, cut-offs bin or presser foot. What are the functions of foot control and knee lifter. How can the presser foot swing out or be detached and attached.
BERNINA L 850 Overlocker/Serger: Stitch Selection, Symbols, Operating Elements

How to read the stitch selection chart and what are the symbols. Where are the operating elements on the machine. Which settings are possible.
BERNINA L 850 Overlocker/Serger: Upper Looper Converter

How to activate the upper looper converter. How to de-activate the upper looper converter. How to sew without upper looper thread.

BERNINA L 850 Overlocker/Serger: Getting Started
BERNINA L 850 Overlocker/Serger: Stitch Selection, Symbols, Operating Elements
BERNINA L 850 Overlocker/Serger: Upper Looper Converter

BERNINA L 850 Overlocker/Serger: Looper Threading, Air Threader

How to thread the loopers. How to use the air threader. How to swing the foot out. How to activate the air threader.
BERNINA L 850 Overlocker/Serger: Needle Threading

How to thread the needles and use the built-in needle threader. How to use the manual needle threader.
BERNINA L 850 Overlocker/Serger: Changing Needles

Which needles are recommended? How to remove or insert the needles. How high are the needles. How to use the manual needle threader. Why tighten the needle set screws.
BERNINA L 850 Overlocker/Serger: Looper Thread Change and Alternative Threading Methods

Looper thread change and alternative threading methods when the yarn can not directly be threaded by air threader. How to use the threading wire when the air threader is blocked. Threads and yarn shall be moving in the air threader pipes freely. Coated yarn/hand-sewing thread is not suitable for air-threader pipes!

BERNINA L 850 Overlocker/Serger: Looper Threading, Air Threader
BERNINA L 850 Overlocker/Serger: Needle Threading
BERNINA L 850 Overlocker/Serger: Changing Needles
BERNINA L 850 Overlocker/Serger: Looper Thread Change and Alternative Threading Methods

BERNINA L 850 Overlocker/Serger: Cutting Width, (Stitch Width) mtc, Rolled Hem

How to adjust the cutting width for various stitches, decorative yarn or wide seams. How to de-activate and activate the knife. Use mtc micro thread control to fine-tune the looper threads to prevent loose loops or fabric tunneling. How to prevent the fabric from rolling unintentionally. How to set for rolled hem to roll the edge intentionally.
BERNINA L 850 Overlocker/Serger: Stretchy Seams and Neatening Edges with 4- and 3-Thread Overlock

How to sew seams with 4- and 3-thread overlock stitches. Neatening fabric edges with 3-thread overlock. How to sew wave free seams in knitwear. How to increase elasticity of stitches.
BERNINA L 850 Overlocker/Serger: Stitch Length, Differential Feed, Gathering

How to adjust the stitch length for various stitches, heavy yarn or fine rolled hems. How to adjust differential feed to prevent soft knits from waving out. How to use differential feed to keep fine woven fabric from puckering. How to adjust differential feed and stitch length for gathering or ruffles in fine fabrics. How to gather both sides regularly.
BERNINA L 850 Overlocker/Serger: 3-Thread Superstretch, 2-Thread Wrapped Overlock

How to sew a 3-thread superstretch stitch. How to sew a 2-thread wrapped overlock.
BERNINA L 850 Overlocker/Serger: Rolled Hem with 3 and 2 Threads, Lettuce Edging, Picot Stitch

How to sew a 3-thread rolled hem. How to sew a 2-thread rolled hem. How to adjust for a picot stitch. How to sew a scalloped edge.
BERNINA L 850 Overlocker/Serger: Flatlock with 3- and 2-Threads

How to sew set and sew flatlock with 3- and 2-threads. What is the advantage of a 2-thread flatlock.
BERNINA L 850 Overlocker/Serger: 2-Thread Blanket Stitch, 2-Thread Overlock

How to set and sew a blanket stitch. How to neaten fabric edges with a decorative 2-thread blanket stitch. How to neaten edges with 2-thread overlock.

BERNINA L 850 Overlocker/Serger: Cutting Width, (Stitch Width) mtc, Rolled Hem
BERNINA L 850 Overlocker/Serger: Stretchy Seams and Neatening Edges with 4- and 3-Thread Overlock
BERNINA L 850 Overlocker/Serger: Stitch Length, Differential Feed, Gathering
BERNINA L 850 Overlocker/Serger: 3-Thread Superstretch, 2-Thread Wrapped Overlock
BERNINA L 850 Overlocker/Serger: Rolled Hem with 3 and 2 Threads, Lettuce Edging, Picot Stitch
BERNINA L 850 Overlocker/Serger: Flatlock with 3- and 2-Threads
BERNINA L 850 Overlocker/Serger: 2-Thread Blanket Stitch, 2-Thread Overlock

BERNINA L 850 Overlocker/Serger: Stitch Optimization 4- and 3-Thread Overlock

The sewing result depends on fabric, threads and needles as well as stitch length and differential feed. To allow the threads to interlock loosely it is recommended to decrease thread tension before increasing other thread tension, to prevent fabric puckering. In this video you will see how to optimize stitches. How to fine tune thread tensions. Why decrease thread tension. How to increase thread tension. How to prevent loose needle thread tension. How to balance looper threads. How to increase the elasticity of the seam
BERNINA L 850 Overlocker/Serger: Stitch Optimization 3-Thread Superstretch, 2-Thread Wrapped Overlock

The sewing result depends on fabric, threads and needles as well as stitch length and differential feed. To allow the threads to interlock loosely it is recommended to decrease thread tension before increasing other thread tension, to prevent fabric puckering. In this video you will see how to optimize stitches. How to fine tune thread tensions. Why decrease thread tension. How to increase thread tension. How to prevent loose needle thread tension. How to balance looper threads. How to increase the elasticity of the seam.
BERNINA L 850 Overlocker/Serger: Stitch Optimization: 3-Thread Rolled Hem, Picot Stitch

The sewing result depends on fabric, threads and needles as well as stitch length and differential feed. To allow the threads to interlock loosely it is recommended to decrease thread tension before increasing other thread tension, to prevent fabric puckering. In this video you will see how to optimize stitches. How to fine tune thread tensions. Why decrease thread tension. How to increase thread tension. How to prevent loose needle thread tension. How to reduce loose loops of the upper looper. How to reduce seam puckering
BERNINA L 850 Overlocker/Serger: Stitch Optimization: 3-Thread Flatlock

The sewing result depends on fabric, threads and needles as well as stitch length and differential feed. To allow the threads to interlock loosely it is recommended to decrease thread tension before increasing other thread tension, to prevent fabric puckering. In this video you will see how to optimize stitches. How to fine tune thread tensions. Why decrease thread tension. How to increase thread tension. How to prevent loose needle thread tension. How to reduce loose loops of the upper looper. How to reduce seam puckering.
BERNINA L 850 Overlocker/Serger: Stitch Optimization: 2-Thread Flatlock, 2-Thread Overlock, 2-Thread Blanket Stitch

The sewing result depends on fabric, threads and needles as well as stitch length and differential feed. To allow the threads to interlock loosely it is recommended to decrease thread tension before increasing other thread tension, to prevent fabric puckering. In this video you will see how to optimize stitches. How to fine tune thread tensions. Why decrease thread tension. How to increase thread tension. How to prevent loose needle thread tension. How to balance looper threads.
BERNINA L 850 Overlocker/Serger: Stitch Optimization: 3-Thread Rolled Hem with Metallic Thread

The sewing result depends on fabric, threads and needles as well as stitch length and differential feed. To allow the threads to interlock loosely it is recommended to decrease thread tension before increasing other thread tension, to prevent fabric puckering. In this video. How to optimize stitches for a 3-thread rolled hem with metallic thread. How to fine tune thread tensions. Why decrease thread tension. How to increase thread tension. How to prevent loose needle thread tension. How to balance looper threads.

BERNINA L 850 Overlocker/Serger: Stitch Optimization 4- and 3-Thread Overlock
BERNINA L 850 Overlocker/Serger: Stitch Optimization 3-Thread Superstretch, 2-Thread Wrapped Overlock
BERNINA L 850 Overlocker/Serger: Stitch Optimization: 3-Thread Rolled Hem, Picot Stitch
BERNINA L 850 Overlocker/Serger: Stitch Optimization: 3-Thread Flatlock
BERNINA L 850 Overlocker/Serger: Stitch Optimization: 2-Thread Flatlock, 2-Thread Overlock, 2-Thread Blanket Stitch
BERNINA L 850 Overlocker/Serger: Stitch Optimization: 3-Thread Rolled Hem with Metallic Thread

BERNINA L 850 Overlocker: Overlocker Maintenance: Cleaning and Oiling

Tips how to clean the sewing area, knives, loopers and feed dog. How to oil the upper looper. Tips how to clean the air-threader pipes. How to clean the thread cutter.

BERNINA L 850 Overlocker: Overlocker Maintenance: Cleaning and Oiling

Support for your BERNINA L 850

To ensure that you enjoy your BERNINA for as long as possible, we recommend that you read the detailed operating instructions. Further support information and firmware updates can be found on the support page.

Download manual Support page BERNINA L 850

Sewing project

Discover the reversible bomberjacket, which makes for a totally cool appearance anywhere. It can be sewn together quickly and is definitely an eye-catcher.

To the sewing project

Try the BERNINA L 850 yourself

Sign up now for a test drive and convince yourself of what makes the BERNINA L 850 so special. Your local dealer will be happy to assist you and to answer all your questions.

We want you to love your BERNINA

We challenged ourselves, pushed boundaries, poured over plans and engineered a machine you will love.

BERNINA L 850

The ultimate Overlocker

BERNINA L 850 – A true masterpiece among sergers

The One-step BERNINA Air Threader

Sew in comfort

Total Stitch Control for perfect seams

Extremely fast, precise & quiet

Quick threading

Grand sewing space

Get a feel for this fantastic machine

Take this machine for a spin with our 360° viewer

Try the BERNINA L 850 yourself

Explore the BERNINA L 850

Features & Functions

Stitches

Overlock Stitch Width

Micro Thread Control (mtc)

One-Step BERNINA Air Threader (for looper threads)

Built-in Needle Threader

Swing-out Presser Foot with Auto Swing Back

Freearm

BERNINA Free Hand System (FHS) with Knee Lifter

Automatic Needle Stop Up

Easy to Engage and Disengage Knife from Outside

Stitches

4-Thread Overlock with Integrated Safety Seam

3-Thread Super Stretch Stitch

3-Thread Overlock Wide (LN)

3-Thread Overlock Narrow (RN)

3-Thread Flatlock Wide (LN)

3-Thread Flatlock Narrow (RN)

3-Thread Narrow Seam

3-Thread Rolled Hem

3-Thread Picotstitch

2-Thread Wrapped Overlock Wide (LN)

2-Thread Wrapped Overlock Narrow (RN)

2-Thread Flatlock Wide (LN)

2-Thread Flatlock Narrow (RN)

2-Thread Rolled Hem

2-Thread Overlock Wide (LN)

2-Thread Overlock Narrow (RN)

2-Thread Blanketstitch Wide (LN)

2-Thread Blanketstitch Narrow (RN)

Overlock Stitch Width

Motor

6-step presser foot pressure

Stitch Selection with Stitch Chart

Total Stitch Control

Thread Tension Adjustment

Stitch Length Adjustment

Stitch Length Fine Adjustment for Rolled Hem

Differential Feed Adjustment

Cutting Width

Micro Thread Control (mtc)

Rolled Hem Selection Lever

Stitch Finger Adjustable

One-Step BERNINA Air Threader (for looper threads)

Pulse Drive

Thread Feed Into Air Threader Nozzle

Color-coded One-path Threading

Can be used with any sequence of threads

Threading Chart

Stitch Diagram

Built-in Needle Threader

Needle Checking Window

Needle Screws Securing Plate

Thread Tension Release

Swing-out Presser Foot with Auto Swing Back

Air Threader Circumvention

Freearm

BERNINA Free Hand System (FHS) with Knee Lifter

Grand Sewing Space

Space to the Right of the Needle

LED Sewing Light

Stitch-by-Stitch Sewing

Automatic Needle Stop Up

BERNINA Foot Control

2-step Presser Foot Lifter

Thread Cutter

Integrated Upper Looper Converter