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White S34 / S34D Parts & Accessories

Replacement parts and accessories confirmed for the White S34 / S34D serger. We hold 3 items whose specification names the S34 / S34D: knives & loopers. Third-party parts made to fit this model are labeled compatible, never as the brand's own. Nothing on this page is assumed from a sibling model — if a part is here, the S34 / S34D is named on it.

Other parts

3 parts

Most-replaced parts on the White S34 / S34D

KNIFE White 299D 7340 8234 S34 S34D Upper carbide (12155, $13.90): the upper knife does the cutting and dulls first — a ragged or chewed edge, fabric pushing instead of slicing, or threads fraying before the loopers catch them means it is due.

LOOPER White 299 299D 7340 8234 S34 S34D Upper (12159, $29): a bent tip or a needle-strike burr on a looper frays thread and throws loops on one side of the stitch; loopers are handed, so the upper and lower are different parts.

Finding your model number

The model number is on the machine itself, not on the carry case or the manual — look for a plate or sticker on the front of the base, the right-hand side, the back near the power socket, or underneath. On a White it is printed as S34 and the letters and suffix are part of it; a sibling model with a different suffix can take different parts.

Common problems and the part that fixes them

SymptomLikely part on this pageHelp page
Edge is ragged or fabric chews instead of cutting (sergers)KNIFE White 299D 7340 8234 S34 S34D Upper carbide (12155)/help/serger-not-cutting-cleanly/
Thread loops or nests on the undersideLOOPER White 299 299D 7340 8234 S34 S34D Upper (12159), LOOPER White 299 7340 8234 S34 S34D Lower (12162)/help/thread-bunching-underneath/
Skipped stitchesLOOPER White 299 299D 7340 8234 S34 S34D Upper (12159), LOOPER White 299 7340 8234 S34 S34D Lower (12162)/help/skipped-stitches/
  • White 299D — shares 2 parts with this model → (no hub — fewer than 3 parts; link the part pages instead)

Frequently asked questions

Which parts do you stock for the White S34 / S34D?

3 items whose specification names the S34 / S34D: 3 knives & loopers. Each one is listed above with its price and whether it is the manufacturer's part, a compatible part, or an accessory cut for this model.

Are the compatible parts for the S34 / S34D as good as the original?

A compatible part is made by a third-party manufacturer to the dimensions of the White part and costs less. For bobbin cases, plates, knives and feet that is usually a sensible buy; for a hook or anything with moving parts on a newer machine the manufacturer's part is the safer choice where we have it. We never describe a compatible part as the brand's own.

Do these parts also fit the White 299D?

2 of the 3 items on this page name the 299D as well, because the two models share those parts. The rest do not — check the fits-these-machines list on each part, and see the related machines below.

Upper or lower knife for the S34 / S34D?

Replace the upper knife first — it is the moving blade and wears several times faster than the lower. Replace the lower only if it is chipped. Both are listed above, each naming the position.

My S34 / S34D needs a part that is not listed. Can you get it?

Email the part name and your model number to support@ultimatesewingandvac.com. If the distributor's catalog carries it we will quote it; if the fitment is uncertain we will say so rather than guess.

Do you ship the same day?

No. Orders are released to the warehouse the next business day and tracking is emailed when the parcel ships. We do not hold stock ourselves, so if an item is unavailable after you order we email you first.