Which needle do I need? System, size and point, from your own machine

If it is a household sewing machine, the needle system is almost certainly 130/705 H. SCHMETZ, which makes the needles, states that "Needle system 130/705 H is used by 99% of all home sewing machines." The same company states that 130/705 H and 15x1 H "are equivalent, same needle anatomy - a flat shank with a scarf." So a package marked 15x1 H is the same needle. 130/705 refers to the flat shank; on the page where SCHMETZ explains how to read a package, it says "The H refers to a German word, Hohlkehle, that translates to scarf" — the indentation above the eye.

If it is a serger, overlock or coverlock, you cannot answer it by brand. Read the manual. That is not a hedge — it is what the needle maker says, three separate times on one page.

Two rows above name different things and are not interchangeable on the strength of both containing the word lockstitch. 134 is what Groz-Beckert calls the standard for lockstitch as a class; DB×1 is what Juki prints on the spec sheet for one particular machine. We did not find DB×1 mentioned anywhere in the Groz-Beckert apparel brochure, and we found no published source establishing that either system substitutes for the other. Read the system off your own machine's specification or off the packet the needle in it came from.

SCHMETZ says of ELx705 CF, "Use only as recommended by the machine manufacturer," and of ELx705, "Do not use this needle in home sewing machines." Inferred, from SCHMETZ's own statement that the flat shank exists "for perfect positioning in the needle bar in relation to the hook": a needle whose shank is not the flat 130/705 shape cannot be relied on to sit at that position, which is why industrial round-shank systems are not a substitute. We have not tested this.

The first number is metric and means something physical. SCHMETZ: "To determine needle size, SCHMETZ measures the diameter of the blade resulting in numbers like .80, .90, etc. This measurement is multiplied by 100." So Nm 80 is a blade 0.80 mm across. The second number is the older American or Singer number, and the two were standardized against each other — "a metric size 80 always equals a size 12, 90 = 14." Both are always printed.

Not every size exists in every point. SCHMETZ lists Universal in 60/8 through 120/19, but Stretch only in 75/11 and 90/14, Quilting only in 75/11 and 90/14, Topstitch only in 80/12, 90/14 and 100/16, and Leather only in 70/10 through 110/18. That is why the fabric chart below mostly gives Stretch as two discrete sizes rather than a range: for Cotton Knit and for highly elastic warp-knit it prints "75/11, 90/14". The Fleece row prints "Stretch 75/11-90/14" in range form, but SCHMETZ makes no Stretch needle between those two sizes, so it comes to the same pair. Before buying, check the size you want against the needle guide's list for that point type.

The table below is eighteen rows taken verbatim from SCHMETZ's published fabric list, which runs to roughly ninety fabrics alphabetically. If yours is not here, use the full chart — link at the end. This is one needle manufacturer's recommendation, not ours, and not the only one published. We have not sewn any of it.

Brother publishes its own chart for the CS7000X, organized by fabric weight and thread rather than fabric name. It is worth reading as an independent column, because it ties needle size to thread weight, which the needle maker's fabric list does not.

Observed, between two published charts: Brother puts corduroy in its heavyweight group at 90/14-100/16, with polyester 60 or cotton or silk 30-50 thread. SCHMETZ's fabric chart gives Corduroy as "Jeans/Denim or Universal 80/12" — finer, and in a different point. Both are reproduced here as published. We have sewn neither and do not resolve it; the weight of the particular cloth, and your machine's size ceiling from step 1, decide it.

Brother also states its own limits, and they read as warnings rather than preferences: "Never use thread of 20 weight or lower. It may cause machine to malfunction." The usable range it gives is 30 to 90 weight. On another support page it says a 75/11 "may bend or break, which could result in injury" on heavyweight fabric, that a 90/14 is recommended for embroidering denim or puffy foam stabilizer, and that gold-colored ball point 90/14 needles "are not recommended for embroidery, as they may bend or break, causing injury." Note that this last one sits beside the same company's instruction to use a gold ball point 90/14 for character and decorative stitch patterns — the two cover different operations, which is exactly the kind of detail that only the manual for your model resolves.

This is mechanical, not mystical. Cale Schoenberg, who writes the Sewing Machine Man newsletter from a repair shop's perspective, describes it plainly: "the hook must pass within a specific distance range from the back of the needle in order to catch the thread loop." Too close and it strikes the needle; too far and it passes behind the loop instead of through it. "A bent needle— even one that is ever so slightly bent— can negatively affect the machine's needle-hook clearance and cause skipped stitches." His first troubleshooting step is to fit a new needle and see whether the problem goes away. SCHMETZ describes the same relationship from the needle's side: the flat shank is there "for perfect positioning in the needle bar in relation to the hook," and the scarf is "the indentation above the eye that allows the bobbin hook to smoothly grab the thread."

Groz-Beckert's published embroidery troubleshooting gives the two failure directions on the fabric side. Under the heading "Fabric damage during embroidery of knitted material": "Needles that are too thick stretch the loops too wide and they burst," with sharp or damaged points tearing the knitting yarns. Under "Irregular embroidery appearance on woven fabric," the listed causes include "Ball point too big" and "Needle too thin," causing needle deflection. Both sections are about embroidery specifically, and both prescribe embroidery systems (DB x K5 Nm 65 and Nm 75). the mechanism is the relationship between needle thickness and yarn, so it should carry over to ordinary sewing — but the source measured it in embroidery. The governing principle Groz-Beckert states is "The needle should be as thin as possible and as thick as necessary."

Industrial and embroidery packages use point codes instead of names. Groz-Beckert publishes them.

There is no way around the model-specific part, so here is exactly where to look.

1. In your manual, find the specifications or accessories section and look for a line naming the needle. On the Brother CS7000X that line reads: "Needles that can be used with this machine: Home sewing machine needles (size 65/9 - 100/16)." That is both the system and the size ceiling for that model, in one sentence. Write the ceiling down; you need it in step 6.
2. On a serger, go to the manual's needle page specifically, not the general specs. Brother's DZ1234 serger chart names the system inline as "130/705H" alongside each fabric weight. Other sergers name ELx705, JLx2 or BLX1 instead, and nothing about the brand tells you which.
3. No manual? Pull the needle that is in the machine and look at the shank. A round shank rules the household family out — that is an industrial needle, because SCHMETZ defines 130/705 as a flat shank. But a flat shank does not rule it in. Many new sergers take flat-shank 130/705 H anyway, and SCHMETZ's JLx2 overlock needle is described as a flat-shank needle "only suitable for household overlock and coverlock machines."
4. So look at the blade instead of the shank. A household 130/705 H needle has one long groove down the front and a scarf — a short indentation just above the eye. Overlock systems have a second long groove down the back as well, and SCHMETZ says that second groove "is necessary to create chain stitches like overlock or coverlock stitches." SCHMETZ puts the difference plainly: standard home sewing needles "have the same basic measurements but only one groove." Two grooves means do not buy a household needle for it.
5. That narrows it; it does not close it. What closes it is the packet the needle came from. This is SCHMETZ's own advice to an owner whose manual said only "needles suitable for overlocker" with no model number: use the system the machine came supplied with. Failing that, the needle page of the manual for your exact model.
6. Now open a needle manufacturer's published fabric chart — SCHMETZ's is the one quoted above — find the fabric actually in your hands, and note the point and size. Then check that size against the ceiling from step 1. The fabric chart is written for machines in general, not for yours. If your manual caps you at 100/16 and the chart says Jeans 110/18 for denim, your machine's limit wins: use the heaviest size your manual allows and adjust thread weight and stitch length instead. This is not theoretical. SCHMETZ reports that "some machine manufacturers have started making smaller bore holes in their needle bars," so that a 120/19 needle no longer fits machines that older needles fitted. Brother's warning for a needle used outside its stated range is that it "may bend or break, which could result in injury."
7. Last, check the needle you are about to fit is straight. Brother's method: "Place the flat side of needle on a flat surface and check that the distance between the needle and the flat surface is even."

On refitting: "With the flat side of the needle toward the back of the machine, insert the needle all the way up until it touches the needle bar stopper." That is Brother's wording in its needle-change instructions for its PR-series embroidery machines. The orientation is the same on its household machines, but the tooling is not — there you turn the needle clamp screw, not an Allen screwdriver and a needle changing tool. Confirm the direction in your own manual before assuming it.

SCHMETZ's own list of clues that a needle needs changing, verbatim: shredded or broken threads; skipped stitch, uneven stitches; puckering or damaging fabric; large stitch holes; machine makes popping or clicking or clunking sounds. On how often: "Hard to know. It could be three seconds or 20 hours."

Two related questions have their own pages here: which bobbin class your machine takes, at the bobbin guide, and whether a given presser foot will fit, at the presser foot guide. The needle system, the bobbin class and the shank height are three independent facts about your machine. Knowing one tells you nothing about the other two.