Sewing machine needle

A sewing machine needle is a specialized needle for use in a sewing machine. A sewing machine needle consists of:[1]

• shank - clamped by the sewing machine's needle holder
• shoulder - where the thick shank tapers down to the shaft
• shaft - a length suitable for driving the eye and thread through the material and down to the bobbin
• groove - cut in the front of the shaft to allow the thread to lie more closely to the needle as it passes through the fabric
• scarf - provides extra room for the hook or shuttle to pass close by
• eye - carries the thread
• point - penetrates the material by either parting the threads or cutting a hole in the fabric

Parts of a sewing machine needle and comparison of several types of needle points and parts

Domestic sewing machines, designed for use in homes as opposed to commercial sewing operations, use a common needle type referred to as "Groz-Beckert 130 / 705," "HAx1" or "15x1" needles. Needles labeled as "universal" needles are of this type and are generally the type of needles found in retail sewing supply shops. There are several sizes and types of needles for commercial/industrial sewing machines.

Construction

The majority of sewing machine needles are made of various grades of hardened steel coated with either nickel or chromium, though certain specialty needles are coated with titanium nitride on top of chromium. Titanium nitride is a reflective golden-colored ceramic material which reduces abrasion allowing the needle to stay sharper longer and last many times longer than other varieties. The titanium does not make the needle any "stronger", however, and such needles will bend and snap just as easily as any other.

Nickel plating is the least expensive and least durable form of plating. Chrome plating lasts longer and gives better abrasion resistance. Titanium nitride on top of chromium is the most expensive and is superior in performance to both chrome and nickel.

Size codes

More than a dozen modern conventions exist for numbering the sizes of sewing machine needles, though only two remain in common use: the American (established and propagated by Singer) and the European (also called the "number metric" or "NM"). The European designation, established in 1942, corresponds to the diameter of the needle in hundredths of a millimeter at a non-reinforced point above the scarf. In both cases, a larger number corresponds to a larger, heavier needle.

Most sewing machine needles will have packaging that gives both of these numbers in its size description — (e.g. as either 100/16 or 16/100). The length of all sewing machine needles has been standardized and does not require a separate code.

The following chart gives a comparison of the two systems:

American	European	Fabric types
8	60	Very fine fabrics (silk, chiffon, organza, voile, lace)
9	65
10	70
11	75	Light weight fabrics (cotton, heavier silks, synthetics, spandex, lycra)
12	80
14	90	Medium weight fabrics (velvet, fine corduroy, linen, muslin, tricot, knits, fleece)
16	100	Heavy weight fabrics (denim, leather, canvas, suiting)
18	110	Very heavy weight fabrics (heavy denim, upholstery fabric, faux fur)
19	120
20	125	Extra heavy fabrics
21	130

Types

Most currently manufactured needles are designated according to "type", and fall into the following categories:

Type	Description
Universal	The universal class of needles are used on domestic machines. "Universal" refers to the shape of the needle shank and length of the needle rather than the actual sewing application or point. The most notable feature of universal needles is the flat face on the needle shank which helps to ensure the needle is inserted correctly. A universal class needle is designed to be used on virtually any domestic sewing machine. They do not fit industrial or commercial machines.
Embroidery	These needles come with an extra large eye and a specially shaped scarf to prevent embroidery thread from shredding.
Ballpoint	Similar to a universal needle but has rounded edges and is not tapered the same way. Intended for closely knit fabrics where the rounded tip will push the weave out of the way rather than cut through it.
Jeans/ Denim	Intended for tightly woven cottons such as canvas. Has a strong, sharp point and very slender eye.
Wing	Needle has distinct "wings" on either side of the eye which hold the fabric open. Often used on hems and borders, and for decorative finishing. A larger size needle will leave a larger hole in the final piece of sewn fabric.
Leather	These have a distinct triangular point to help the needle make a large, clean hole in non-woven materials like vinyl.
Metallic	Similar to an embroidery needle with a large eye and extra long scarf, but also includes a Teflon coating to the eye so that metallic threads will not shred when used.
Quilting	Designed with an extra strong shaft and with a tapered point to penetrate multiple layers of woven fabrics without breaking and without shredding either the thread or the fabric being sewn.
Serger/ Industrial	These needles can only be used in serger and overlocking machines.
Microtex/ Sharps	More slender and sharper than the universal needle. Suitable for fine woven fabrics, but also compatible for quilting and appliqué.
Stretch	These needles are intended for use on fabrics with a significant amount of Spandex or similar fabric content. Rounded tip and specialized scarf and eye to prevent skipping.
Topstitching	These have exceptionally sharp points and a very large eye to accommodate thick decorative topstitching threads. Very similar to the leather needle.
Twin/ Triple	Needles set in pairs or in groups of three on a single shaft designed to sew multiple, usually decorative, threads at once. These require specialized machinery to accommodate the extra needles, as well as multiple thread feeds. The twin or triple designation is usually accompanied by another needle type specification such as "stretch" or "denim", etc.

Singer number and color codes

Singer colors and numbers its needles with the following system of codes to indicate the needle point type and shaft size:

code and shank color	Point type
2000 - uncolored	chromium-coated regular point, for high-speed embroidery stitching
2020 - red	regular point, for woven fabrics (most common Singer needle type)
2022, 2053, 2054 - uncolored	overlock needles, only for overlocking machines
2044 - uncolored	embroidery needle
2045 - yellow	ball point, for knits
2026 - blue	heavy-duty point, for denims
2032 - brown	chisel or wedge point, for leathers
2025 - uncolored	twin needles
2040 - uncolored	hemstitch or wing-needle, for "heirloom" or decorative sewing, best on woven cottons and linens

Shoulder color	Shaft size
green	9
orange	11
blue	14
purple	16
silver	18

SVP Worldwide colour codes

The coloured band on some types of Inspira needles indicates the needle type.

Shoulder colour	Type
purple	Stretch
yellow	Microtex
red	Embroidery
blue	Denim
green	Quilting
uncolored	Others

Kenmore color codes

Kenmore colors its needles with a different system of color codes which indicate the needle's size:

Shank color	Shaft size	Shaft size (Europe)
blue	11	75
orange	12	80
red	14	90
purple	16	100
green	18	110

Schmetz colour codes

The coloured top band on some types of Schmetz needles indicates the needle type.[2]

Top shoulder colour	Type
yellow	Stretch
lightgray	Super Stretch
blue	Jeans
orange	Jersey
green	Quilting
red	Embroidery
purple	Microtex
pink	Metallic
lt. green	Topstitch
brown	Leather
uncolored	Others

References

1. Lydia Morgan (November 6, 2008). "Machine-needle know-how". Threads Magazine. No. 94. pp. 59–61.
2. Schmetz Needle Chart