Bernina L 850 review
VerdictSpecs checked against Bernina data · Checked Sep 2026
8.5/108.5
out of 10
The L 850 is a dealer-only 2/3/4 thread air-threading serger with a knee lift, 1,500 spm and 18 stitches, whose $3,999 MSRP buys mechanical refinement rather than the touchscreen or coverstitch of its L 860 and L 890 siblings.
Who it's for
A garment sewer who serges often, wants one-step air threading, a knee lifter and Bernina dealer support, and is buying on a dealer promotion rather than at MSRP.
Skip it if
You want a coverstitch in the same machine (L 890), continuous auto tension (Baby Lock), or you are not prepared to pay several times the price of a Juki MO-1000 for similar thread counts.
Price band$3,000 and up
$$$$$ 3k+Serger
Find a Bernina dealerBernina publishes dealer pricing only. Ask a dealer for today's price.
Real cost to get sewing
Machine $$$$$ 3k+Accessory box extension: Optional on the L 850, standard on L 860 and L 890; dealer price not published on pages foundSpecialty feet: Bernina L series feet such as the gathering foot are dealer items; price not capturedELx705 needles: Serger-specific needle system, sizes 70 to 90; not the household 130/705HDealer new owner class: Usually included with a Bernina dealer purchase; confirm
Specs
Research pass 2026-09-29 · manufacturer page check pendingSource: qualitysewing.com · bernina.com · meissnersewing.com · shopify.35thavesewandvac.com. Bracketed cells are values the manufacturer does not publish; we never fill a spec we can't source.
Where sources disagree
- Price: $3,999 MSRP (qualitysewing.com, berninaomaha.com) vs $2,499 paid during a promotion (PatternReview owner). Catalog will show $3,999 [verify] and note that dealer promotions run well below MSRP.
- Weight and dimensions: 27.1 lb and 18 x 13 x 16 in from a dealer listing; Bernina's own page value not captured. Catalog will show them flagged [verify].
- Differential feed and presser foot lift height: described as adjustable and 2-step but no numeric range or mm figure in any snippet. Values stay descriptive.
- Warranty: Bernina's general 20/5/2 warranty vs a dealer listing saying all machines include a 1 year service warranty. These are different things (parts vs dealer labor). Catalog will cite Bernina.
- Stitch width: 3 to 9 mm appears on a dealer page (rockymountainsewing.com); the flyer figure was not captured.
Manufacturer claims we quote but do not assert (4)
- "The ultimate overlocker" (manufacturer flyer, bernina.com)
- "For professional overlock seams" (manufacturer tagline, bernina.com)
- "Threads like magic" style wording about the air threader (dealer copy, sewingmachinesales.co.uk)
- "Low price guarantee" (dealer claim, meissnersewing.com); MSRP is set by Bernina and dealer prices vary
Strengths
One-step air threading of both loopers plus a built-in needle threader.
Free Hand System knee lifter and Micro Thread Control adjustable while sewing, rare on sergers.
27.1 lb build that owners describe as steady at full speed, with a 20 yr mechanical warranty.
Weaknesses
$3,999 MSRP; the same thread counts and air threading cost far less from Juki, and dealer promotions make the real price hard to pin down.
No coverstitch or chainstitch; those live in the L 890.
Differential feed range, foot lift height and Bernina's own weight figure are not published on pages found.
Check before you buy
3 checks01
Ask for the promotion price, not MSRPOne owner paid $2,499 during a dealer promotion against a $3,999 list. Bernina sets MSRP and dealers discount; get a written quote.
02
Test the 4-thread stitch before leaving the dealerOne owner's unit shipped with a misaligned needle so the 4-thread overlock would not form. Have the dealer sew a chain on all four threads.
03
Decide on the L 860 screen firstThe L 860 adds a color touchscreen with guided setup for about $1,500 more per an owner; stitch capability is the same class.
What owners say
Paraphrased, attributed. We did not operate this machine.positive
An owner who replaced a 20-year-old Bernina 800DL calls the L 850 substantial and steady at top speed, bought it at $2,499 on promotion, and could not justify the $1,500 step to the L 860.sewing.patternreview.com
mixed
One unit arrived with a misaligned needle so the 4-thread stitch would not form until adjusted; the same owner notes a chirp alert when the knee lift and pedal are used together, and traced a tension problem to lifting the foot mid-seam.sewing.patternreview.com
mixed
Buyers cross-shopping the L 850 against the Baby Lock Acclaim weigh Bernina's set-once tension against Baby Lock's continuous automatic tension.sewing.patternreview.com
Questions people ask
How much does the Bernina L 850 cost?
Dealer listings quote a $3,999 MSRP. One owner paid $2,499 during a promotion. Bernina is dealer only, so the price is set at the counter.
What is the difference between the L 850 and L 860?
The L 860 adds a color touchscreen with guided and expert modes that preset tension, stitch length and differential feed. An owner put the gap at about $1,500.
Bernina L 850 or Baby Lock Acclaim?
Both air-thread. Forum members note the Bernina sets an initial tension per stitch while Baby Lock adjusts tension continuously as you sew. Neither has a public price.
Does the L 850 have air threading?
Yes. Bernina's One-Step Air Threader threads both loopers via the foot control, and there is a built-in needle threader.
Does the Bernina L 850 do coverstitch?
No. Coverstitch and chainstitch are on the L 890.
What needles does the Bernina L 850 use?
ELx705 serger needles in sizes 70 to 90, per dealer listings.
How heavy is the L 850?
27.1 lb, about 12.3 kg, per a dealer listing; Bernina's own figure was not captured.
What is the throat space on the L 850?
5 5/8 in to the right of the needle and 3 3/8 in high, per a dealer listing.
Does the L 850 have a free arm?
Yes, owners single out the free arm as a feature few serger brands offer.
What is the Bernina warranty on the L 850?
Bernina's US warranty is 20 years on mechanical parts, 5 on circuit boards and 2 on electrical parts; labor is not covered.
