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Machine reference
Needles, bobbins, feet and other details for this model. Check the requirements before choosing parts.
Before choosing a part
Start with these documented details. Read the requirements with each answer before choosing a needle, bobbin or foot.
Not yet confirmed here: Manufacturer accessory group, Presser-foot shank type, Foot attachment, Foot holder / mount, Foot interface / generation, Bobbin type / class, Bobbin material, Bobbin diameter, Bobbin height, Hook type, Maximum stitch / zigzag width, Feed system, Bobbin loading direction. What is still to confirm →
Other names, regional versions and related models have not been confirmed here. A shared manual, product line or accessory group does not identify the machine's family.
System 130/705H is the only needle system the manual names, so no other system is confirmed here. Check the needles before each project: they must not be bent, damaged or blunt, or have hooked points (PDF page 23, printed page 21).
Documents and page references →Switch the machine off first and use “Changing the presser foot” on PDF page 19 (printed page 17). Use only attachments the manual recommends: it states no shank class and names no third-party feet, so other feet are not confirmed.
Documents and page references →Always make a trial run on the fabric being sewn. Each stitch’s basic length and differential settings are in the stitch overview on PDF pages 36–37 (printed pages 34–35).
Documents and page references →Switch the machine off (“0”) and disconnect it from the electricity supply first, and never touch the upper knife shaft while the machine runs. The width depends on which needle is used; no single maximum is stated for every stitch.
Documents and page references →Basic settings for each stitch are on PDF pages 36–37 (printed pages 34–35) and may vary slightly with the material and thread. Only the overlock stitches the manual lists are answered; no other stitch type is claimed.
Documents and page references →Switch the machine off (“0”) first, and unplug it when covers are opened to thread the loopers. Thread in the manual’s colour-coded order from PDF page 44 (printed page 42); if the lower looper needs re-threading, follow the note on PDF page 45 (printed page 43).
Documents and page references →Switch the machine off (“0”) and disconnect it from the electricity supply first. Use “Inserting the needles” on PDF page 22 (printed page 20), then check that each needle is fully inserted with its flat side to the back. Do not use bent needles.
Documents and page references →M is the factory medium setting. After using the elasticator, which sets the knob to H, reset the pressure. The troubleshooting table on PDF page 62 (printed page 60) links pressure that is too low or too tight to feeding and seam problems.
Documents and page references →Figures are from the technical data on PDF page 62 (printed page 60). BERNINA reserves the right to make changes in the interest of technical progress.
Documents and page references →For the trial run, set all tensions to 4 and sew on a double layer of fabric, then turn a dial by only half or one number at a time. The symptoms and corrections are on PDF page 52 (printed page 50); the stitch overview settings are basic adjustments only.
Documents and page references →Set the main switch to “0” and unplug the machine before cleaning or lubricating. Lubricate only the points shown on PDF page 61 (printed page 59), and only now and then. The manual names no oil type.
Documents and page references →Set the main switch to “0” and unplug the machine first; the manual also says to unplug when covers are opened to raise the knife. The lower-knife steps are on PDF page 60 (printed page 58); a damaged upper knife is replaced by a BERNINA dealer.
Documents and page references →Unplug the machine and let the bulb cool before changing it, using the steps on PDF page 61 (printed page 59). Choose the foot control by region and voltage as printed: YC-482 for the USA and Canada only, YC-483N for 220–240V.
Documents and page references →No part numbers are printed for any of these items. The manual says to use only attachments the manufacturer recommends in it; no other accessory fit is stated, and no retailer fit is claimed here.
Documents and page references →Close both covers fully, because a safety switch keeps the motor from running while either is open. The full troubleshooting table, with page references, is on PDF page 62 (printed page 60).
Documents and page references →Manuals, parts books & more
Publisher links below distinguish a matched file from a listing.
Choose the document for your task: an instruction manual, service manual, parts list and accessory guide answer different questions.
About this document & page references →
Instruction manualEdition: No. A915012M00A GB/E/D/F, 2006.3, © Copyright 2006 by Fritz Gegauf AG, 5020107024 (printed back cover, physical 67); PDF metadata title BERNINA1200MDA.indd, created 2006-03-06
Models referenced here: BERNINA 1200MDA
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We checked that this file matched the source used here on 2026-11-05. The publisher may later replace its file.
Read the model-specific requirements with each answer before choosing parts.
Use needles of the system 130/705H (household needles). For standard applications the manual says to use universal needles in sizes No. 70 to 90 (equivalent to 10 to 14 in the US). Its thread - needle selection table pairs all purpose overlock thread 120/2 (polyester) with needles 70-90 and spun polyester with needles 80-90, each for needle and looper threads; polyester continuous filaments, woolly nylon and embroidery/darning and decorative threads are listed for the loopers only. A 130/705H needle set is among the supplied accessories.
Switch the machine off (power switch to "0") and disconnect it from the electricity supply first. Then follow the "Inserting the needles" steps on PDF page 22 (printed page 20), which use the supplied brush/needle inserter; each needle goes in with its flat side towards the back. Afterwards the needles must be fully inserted into the needle clamp with the flat side to the back: the troubleshooting table lists incorrectly inserted needles as a cause of thread breaks and broken needles. Do not use bent needles.
The 1200MDA is an overlocker: the technical data describe stitches formed by one or two needles and one or two loopers, and the manual names no bobbin, bobbin case or hook. Recorded as not stated, not as incompatible.
A catch releases the presser foot from its clamp. A foot attaches under the shaft, with the groove in the shaft lined up exactly with the presser foot pin; when the shank is lowered the foot engages automatically. Switch the machine off first and follow the "Changing the presser foot" steps on PDF page 19 (printed page 17). The supplied accessories include a blind stitch foot and an elasticator.
Presser foot pressure is set with the presser foot pressure regulating knob and is factory adjusted to a medium setting: M is the normal position. Turn it to H (high) for thick or stiff fabrics such as denim, tweed or firm linen, and to L (low) for light-weight or sheer fabrics and knits. The elasticator foot instructions set the knob to H; after finishing with the elasticator, reset the presser foot pressure.
Specifications apply to the named model and document edition. Read any setup, fabric or safety requirements with the answer.
The manual lists 17 supplied accessories: 1 needle set 130/705H; 2 small screwdriver; 3 tweezers; 4 upper looper converter; 5 brush/needle inserter; 6 electronic foot control; 7 oiler; 8 nets; 9 lower knife; 10 spool caps; 11 accessory bag; 12 dust cover; 13 large screwdriver; 14 bulb holder; 15 waste collector; 16 blind stitch foot; 17 elasticator. Its optional accessories page lists four more: a multi-purpose foot for piping, beads and pearls; a gathering attachment; a cording foot; and a seam guide. The front of the machine has an attachment screw for optional accessories. No part numbers are printed for any of these items.
The 1200MDA is a 2/3/4-thread overlocker, and its stitch overview lists 15 stitches. 4/3-thread (stitches 1 to 8): 1 4-thread overlock with integrated safety seam; 2 3-thread super stretch; 3 3-thread overlock (left needle); 4 3-thread overlock (right needle); 5 3-thread flatlock (left needle); 6 3-thread flatlock (right needle); 7 3-thread narrow seam; 8 3-thread roll hem. 2-thread (stitches 9 to 15): 9 2-thread wrapped overlock (left needle); 10 2-thread wrapped overlock (right needle); 11 2-thread flatlock (left needle); 12 2-thread flatlock (right needle); 13 2-thread roll hem; 14 2-thread overlock (left needle); 15 2-thread overlock (right needle). The 2-thread stitches use the supplied upper looper converter in place of an upper looper thread. Stitches 7, 8 and 13 are sewn with the roll hem selection lever pulled to the front marking on the stitch plate; for overlocking it is pushed to the rear marking.
The technical data give a sewing speed of up to 1500 s.p.m., a weight of 8.4 kg and dimensions of 300 (W) x 260 (D) x 290 (H) mm. The handwheel rotates forwards: anti-clockwise, in the direction of the arrow above it.
Set the main switch to "0" and disconnect the machine from the electricity supply first. Dust and fluff collect in and on the machine during sewing and should be removed regularly. The machine requires very little lubrication: now and then, lubricate only the points illustrated on PDF page 61 (printed page 59). An oiler is among the supplied accessories.
The upper (moving) knife is made from special hardened material; if it gets damaged, it can be replaced by your local BERNINA dealer. A replacement lower knife is supplied in the accessory bag. To change the lower knife, set the main switch to "0" and disconnect the machine from the electricity supply, then follow the "Changing the lower knife" steps on PDF page 60 (printed page 58). The replacement knife sits in the groove with its sharp edge in line with the stitch plate, and the setscrew is re-tightened.
Switch the machine off (power switch to "0") and disconnect it from the electricity supply, then turn the cutting width adjusting dial inside the looper cover. Settings 1 to 5 give seam widths of 5, 6, 7, 8 and 9 mm (1/5", 1/4", 9/32", 5/16" and 11/32"), measured from the left needle; working with the right needle reduces each width by 2 mm (3/32"). The upper and lower knives move together. Use wide seams on loosely woven fabric and smaller seams on dense fabric. The technical data print the seam width as 3-7 mm (right needle 3/2 thread overlock), 5-9 mm (left needle 3/2 thread overlock) and 5-9 mm (4 thread overlock / 3/2 thread overlock / 3 thread super stretch).
Stitch length is infinitely variable from 1 to 4 mm and can be adjusted while sewing; most overlock work is done with a basic setting of 2.5 mm. The differential feed has a front and a rear feed dog and is also adjusted on its dial while sewing. The technical data give 0.7 to N for no puckering and N to 2 for no waving or fluting in knits. The manual's table: 2 for wave-free seams in thick wool knits, hand knitted articles and very stretchy fabrics; 1.5 for wave-free seams in cotton, silk, synthetic jersey, sweatshirt fabrics and fine knits; N (normal feed) for woven fabrics; 0.7 for no puckering in "fine nylon jersey, closely woven fabrics, lining fabric satin, poplin".
Sewing light: replace the bulb with the same type, rated max. 12V / 5W for model 1200MDA; replacement bulbs are available from your BERNINA dealer. Set the main switch to "0", disconnect the machine and let the bulb cool down before changing it; the steps, using the supplied bulb holder, are on PDF page 61 (printed page 59). Foot control: for the 1200MDA use only foot control model YC-482 (USA, Canada) or YC-483N (220-240V).
Switch the machine off (power switch to "0") and follow the threading preparation on PDF page 34 (printed page 32); thread carefully and in the correct sequence. For the 4/3-thread stitches (1 to 8) the order, with colour-coded guides, is: 1 upper looper (blue), PDF page 44 (printed 42); 2 lower looper (red), PDF page 45 (printed 43); 3 right-hand needle (green), PDF page 46 (printed 44); 4 left-hand needle (yellow), PDF page 47 (printed 45). When threading is complete, lower the upper knife and close the looper cover. If the lower looper has to be re-threaded, follow the note on PDF page 45 (printed page 43): the lower looper is threaded before the needles. For the 2-thread stitches (9 to 15), thread the same way without the upper looper thread and fit the upper looper converter (PDF page 48, printed page 46). The automatic needle threader steps are on PDF page 35 (printed page 33).
Each needle and looper thread has its own tension dial, adjustable from 1 to 9: turn it down for less tension and up for more. The ideal setting for most fabrics and threads is between 3 and 5, but it can vary considerably with special threads such as filament, woolly nylon, buttonhole twist (cordonnet), pearl yarn or decorative threads; use decorative threads only in the loopers. For the trial run, set all tensions to 4 and sew on a double layer of fabric. Stitch formation is right when both looper threads meet at the fabric edge and the needle threads form straight stitches. To correct it, turn a dial by only half or one number, then test sew again; the manual's list of symptoms and corrections is on PDF page 52 (printed page 50).
Check three things: the looper cover and the cloth plate cover must be completely closed, because a safety switch keeps the motor from running while either is open; the main switch must be on ("I"); and the machine must be plugged in. The needle drive is also locked while the swing-out presser foot is not in its working position.
Use the full source procedure and its safety precautions. A short referenced answer is not a substitute for service documentation or qualified electrical/mechanical repair.
Service-manual availability and service-only procedures remain unestablished unless separately cataloged and reviewed.
Answers use this model’s own instruction manual with its stated safety conditions. Where the manual contradicts itself or gives no value, no answer is given. No hands-on testing or replacement-part fit is claimed.
An unanswered question does not mean a part is incompatible. We have not confirmed enough information to recommend it.
Bobbin — Bobbin use: The 1200MDA is an overlocker: the technical data describe stitches formed by one or two needles and one or two loopers, and the manual names no bobbin, bobbin case or hook. Recorded as not stated, not as incompatible. Full recorded limit & conditions →
Other names, regional versions, production history, further specifications and documents are not fully covered here. Their absence is not a “none exist” finding.
Each answer links to its exact evidence passage below. Open a reference to see the document and page. These links identify the source; they do not include the full manual or its diagrams. Document access is consolidated in the OEM library above.
Published by BERNINA · No. A915012M00A GB/E/D/F, 2006.3, © Copyright 2006 by Fritz Gegauf AG, 5020107024 (printed back cover, physical 67); PDF metadata title BERNINA1200MDA.indd, created 2006-03-06 · English, Spanish, German and French (GB/E/D/F)
Checked against the document text.
Document and available links →About this document →PDF page 1 · printed page cover
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Exact native cover of the 1200MDA instruction manual, physical 1 (unnumbered). The native text is the four-language title and the model 1200MDA; the BERNINA mark and the "Overlocker / Serger" script are artwork without native text (visually checked). Binds this manual to the exact 1200MDA only.
PDF page 7 · printed page 5
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Exact native English welcome text, physical 7 / printed 5: the manual names the BERNINA 1200MDA a 2/3/4-thread serger / overlocker. Scope page. Binds the body of the manual to the exact 1200MDA only.
PDF page 3 · printed page 1
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Important safety instructions (English), physical 3 / printed 1: names model 1200MDA and the bulb rating.
PDF page 3 · printed page 1
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Important safety instructions 7, 9 and 10, physical 3 / printed 1. Only the switch-off, unplug and bent-needle instructions are used.
PDF page 3 · printed page 1
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Important safety instruction DANGER 2, physical 3 / printed 1.
PDF page 3 · printed page 1
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Important safety instruction WARNING 2, physical 3 / printed 1. Quoted; it names no other attachment.
PDF page 12 · printed page 10
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Only the stated document, exact 1200MDA model and cited English passage; no other BERNINA or bernette overlocker, edition, standardized-fit or retail-fit inference. Front View legend, physical 12 / printed 10 (28 numbered items; only these are used, spelling "Attachement" as printed).
PDF page 13 · printed page 11
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Only the stated document, exact 1200MDA model and cited English passage; no other BERNINA or bernette overlocker, edition, standardized-fit or retail-fit inference. Inside Looper Cover legend, physical 13 / printed 11 (11 items; only these are used).
PDF page 13 · printed page 11
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Only the stated document, exact 1200MDA model and cited English passage; no other BERNINA or bernette overlocker, edition, standardized-fit or retail-fit inference. English Accessories list, physical 13 / printed 11: all 17 numbered items exactly as printed, counted on the rendered page. No part numbers are printed.
PDF page 14 · printed page 12
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Foot Controller note, physical 14 / printed 12: names model 1200MDA and the two foot control models with their printed regional and voltage qualifiers.
PDF page 14 · printed page 12
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Only the stated document, exact 1200MDA model and cited English passage; no other BERNINA or bernette overlocker, edition, standardized-fit or retail-fit inference. Safety Switch note, physical 14 / printed 12.
PDF page 17 · printed page 15
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Only the stated document, exact 1200MDA model and cited English passage; no other BERNINA or bernette overlocker, edition, standardized-fit or retail-fit inference. Swing-out presser foot note, physical 17 / printed 15. Only the drive-lock note is used.
PDF page 19 · printed page 17
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Only the stated document, exact 1200MDA model and cited English passage; no other BERNINA or bernette overlocker, edition, standardized-fit or retail-fit inference. Changing the presser foot, physical 19 / printed 17. Used for the switch-off prerequisite, the attachment mechanism and the two illustrated feet; the steps are pointed to, not paraphrased. No shank class or third-party fit.
PDF page 21 · printed page 19
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Only the stated document, exact 1200MDA model and cited English passage; no other BERNINA or bernette overlocker, edition, standardized-fit or retail-fit inference. Handwheel, physical 21 / printed 19.
PDF page 22 · printed page 20
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Only the stated document, exact 1200MDA model and cited English passage; no other BERNINA or bernette overlocker, edition, standardized-fit or retail-fit inference. Inserting the needles, physical 22 / printed 20 ("ß at" is the extracted fl ligature, "flat"). Used for the prerequisite and the flat-side orientation; the steps are pointed to, not paraphrased.
PDF page 23 · printed page 21
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Only the stated document, exact 1200MDA model and cited English passage; no other BERNINA or bernette overlocker, edition, standardized-fit or retail-fit inference. Needles, Needle condition and Needle and thread matching (English), physical 23 / printed 21.
PDF page 25 · printed page 23
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Only the stated document, exact 1200MDA model and cited English passage; no other BERNINA or bernette overlocker, edition, standardized-fit or retail-fit inference. English thread - needle selection table, physical 25 / printed 23: five thread rows, counted and row-mapped on the rendered page (row 1 70-90 needles and looper threads; rows 2 and 3 loopers only with no needle size; row 4 80-90 needles and looper threads; row 5 70-90 loopers only). The table's "cover stitch" application wording is not a machine capability (see holds).
PDF page 26 · printed page 24
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Only the stated document, exact 1200MDA model and cited English passage; no other BERNINA or bernette overlocker, edition, standardized-fit or retail-fit inference. Stitch length, physical 26 / printed 24.
PDF page 26 · printed page 24
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Only the stated document, exact 1200MDA model and cited English passage; no other BERNINA or bernette overlocker, edition, standardized-fit or retail-fit inference. Cutting width, physical 26 / printed 24: the five-setting table is quoted exactly.
PDF page 28 · printed page 26
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Only the stated document, exact 1200MDA model and cited English passage; no other BERNINA or bernette overlocker, edition, standardized-fit or retail-fit inference. Differential Feed Setting, physical 28 / printed 26.
PDF page 29 · printed page 27
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Only the stated document, exact 1200MDA model and cited English passage; no other BERNINA or bernette overlocker, edition, standardized-fit or retail-fit inference. English Differential Feed Adjustment table, physical 29 / printed 27: four rows (2, 1.5, N, 0.7), counted and row-mapped on the rendered page; fabric wording literal.
PDF page 29 · printed page 27
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Only the stated document, exact 1200MDA model and cited English passage; no other BERNINA or bernette overlocker, edition, standardized-fit or retail-fit inference. Presser foot pressure (English), physical 29 / printed 27.
PDF page 34 · printed page 32
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Only the stated document, exact 1200MDA model and cited English passage; no other BERNINA or bernette overlocker, edition, standardized-fit or retail-fit inference. Threading Preparation, physical 34 / printed 32. Used for the prerequisite and the sequence instruction; the preparation steps are pointed to, not paraphrased.
PDF page 35 · printed page 33
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Only the stated document, exact 1200MDA model and cited English passage; no other BERNINA or bernette overlocker, edition, standardized-fit or retail-fit inference. Heading only, physical 35 / printed 33; the threader steps are pointed to, not paraphrased.
PDF page 36 · printed page 34
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Only the stated document, exact 1200MDA model and cited English passage; no other BERNINA or bernette overlocker, edition, standardized-fit or retail-fit inference. Stitch Formation Overview, physical 36 / printed 34 (settings continue on physical 37 / printed 35): 15 numbered rows, stitches 1-8 under 4/3 Thread OL and 9-15 under 2 Thread OL. The stitch numbers were mapped to the names on the rendered page; the extracted text lists the names in row order. "ß atlock" is the extracted fl ligature, "flatlock".
PDF page 44 · printed page 42
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Only the stated document, exact 1200MDA model and cited English passage; no other BERNINA or bernette overlocker, edition, standardized-fit or retail-fit inference. Physical 44 / printed 42. Heading and note only; the threading steps are pointed to, not paraphrased.
PDF page 45 · printed page 43
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Only the stated document, exact 1200MDA model and cited English passage; no other BERNINA or bernette overlocker, edition, standardized-fit or retail-fit inference. Physical 45 / printed 43. Heading and note only; the threading steps are pointed to, not paraphrased.
PDF page 46 · printed page 44
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Only the stated document, exact 1200MDA model and cited English passage; no other BERNINA or bernette overlocker, edition, standardized-fit or retail-fit inference. Physical 46 / printed 44. Heading only; the threading steps are pointed to, not paraphrased.
PDF page 47 · printed page 45
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Only the stated document, exact 1200MDA model and cited English passage; no other BERNINA or bernette overlocker, edition, standardized-fit or retail-fit inference. Physical 47 / printed 45. Heading and completion instruction only; the threading steps are pointed to, not paraphrased.
PDF page 48 · printed page 46
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Only the stated document, exact 1200MDA model and cited English passage; no other BERNINA or bernette overlocker, edition, standardized-fit or retail-fit inference. Upper Looper Converter, physical 48 / printed 46. The fitting steps are pointed to, not paraphrased.
PDF page 49 · printed page 47
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Only the stated document, exact 1200MDA model and cited English passage; no other BERNINA or bernette overlocker, edition, standardized-fit or retail-fit inference. Roll hemming, physical 49 / printed 47.
PDF page 50 · printed page 48
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Only the stated document, exact 1200MDA model and cited English passage; no other BERNINA or bernette overlocker, edition, standardized-fit or retail-fit inference. Sewing test, physical 50 / printed 48.
PDF page 51 · printed page 49
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Only the stated document, exact 1200MDA model and cited English passage; no other BERNINA or bernette overlocker, edition, standardized-fit or retail-fit inference. Thread tension and Check your trial run, physical 51 / printed 49.
PDF page 52 · printed page 50
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Only the stated document, exact 1200MDA model and cited English passage; no other BERNINA or bernette overlocker, edition, standardized-fit or retail-fit inference. Physical 52 / printed 50. The symptom-and-correction list is pointed to, not paraphrased.
PDF page 58 · printed page 56
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Only the stated document, exact 1200MDA model and cited English passage; no other BERNINA or bernette overlocker, edition, standardized-fit or retail-fit inference. Elasticator foot, physical 58 / printed 56. Only the pressure setting, the reset note and the elastic widths are used.
PDF page 60 · printed page 58
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Only the stated document, exact 1200MDA model and cited English passage; no other BERNINA or bernette overlocker, edition, standardized-fit or retail-fit inference. Physical 60 / printed 58. Used for the dealer statement, the prerequisite and the fitted-position check; the lower-knife steps are pointed to, not paraphrased.
PDF page 61 · printed page 59
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Only the stated document, exact 1200MDA model and cited English passage; no other BERNINA or bernette overlocker, edition, standardized-fit or retail-fit inference. Replacing the bulb, physical 61 / printed 59. The bulb-change steps are pointed to, not paraphrased.
PDF page 61 · printed page 59
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Only the stated document, exact 1200MDA model and cited English passage; no other BERNINA or bernette overlocker, edition, standardized-fit or retail-fit inference. Cleaning and lubricating, physical 61 / printed 59. The lubrication points are only illustrated; no oil type is named.
PDF page 62 · printed page 60
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Only the stated document, exact 1200MDA model and cited English passage; no other BERNINA or bernette overlocker, edition, standardized-fit or retail-fit inference. Technical data, stitch choice row, physical 62 / printed 60.
PDF page 62 · printed page 60
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Only the stated document, exact 1200MDA model and cited English passage; no other BERNINA or bernette overlocker, edition, standardized-fit or retail-fit inference. Technical data table, physical 62 / printed 60: 11 rows (stitch choice, needle system, seam width, stitch length, differential feed, presser foot lifter, handwheel, sewing speed, weight, dimensions, foot control model nr.), counted and row-mapped on the rendered page; the extracted text lists labels and values in separate runs.
PDF page 62 · printed page 60
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Only the stated document, exact 1200MDA model and cited English passage; no other BERNINA or bernette overlocker, edition, standardized-fit or retail-fit inference. English troubleshooting table, physical 62 / printed 60; causes and solutions row-mapped on the rendered page.
PDF page 66 · printed page 64
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Only the stated document, exact 1200MDA model and cited English passage; no other BERNINA or bernette overlocker, edition, standardized-fit or retail-fit inference. Optional Accessories, physical 66 / printed 64: four items, counted on the rendered page; no part numbers are printed.
PDF page 67 · printed page back cover
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Back cover colophon, physical 67 (unnumbered). Edition and document identifiers only; retained for lineage, not used by an owner answer.
Alex Shick · Founder and editor. Corrections managed by Alex Shick.
This BERNINA 1200MDA guide is based on documents, with AI assistance to organize the information. We have not tested or repaired the machine.
Check the document edition with each answer. A source review date is not a machine inspection date or a promise that the manual is the latest edition.
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