M2 Standoffs | McMaster-Carr

Filter by

System of Measurement

Length

Gender

Nut Type

Material

Pitch

Width

Mount Type

Thread Length

Shape

Threading

Coupling Nut Profile

Thread Pitch

For Adapting

Drive Style

Height

Export Control Classification Number (ECCN)

Thread Fit

Performance

RoHS

Compliant with Exemptions

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Yes

REACH

Compliant

Not Compliant

DFARS Specialty Metals

Thread Type

12 Products

Coupling Nuts

Also known as extension nuts, these are commonly used to connect lengths of threaded rod and join threaded parts.

Low-Strength Steel

Rated Grade 2 or lower, these are about half as strong as medium-strength steel coupling nuts. Use them with threaded rods that have a comparable strength rating to avoid stripping threads during installation.

Zinc-Plated Steel—A step up from plain steel, the zinc plating withstands occasional exposure to moisture.

Black-Oxide Steel—A dark, matte coating creates a finished look. Nuts offer minimal corrosion resistance, so they're best for dry environments.

						Each
	Thread Size	Lg., mm	Wd., mm	Threading		1-9	10-49	50-Up
Zinc-Plated Steel



		M2 × 0.4 mm	6	4.5	Fully Threaded	93355A510	00000	00000	00000


		M2 × 0.4 mm	12	4.5	Fully Threaded	90264A801	0000	0000	0000


		Black-Oxide Steel



				M2 × 0.4 mm	6	4.5	Fully Threaded	93020A101	0000	0000	0000

Corrosion-Resistant Stainless Steel

18-8 Stainless Steel—The choice for wet and outdoor environments, these nuts resist rust. However, they won't hold up to the harsh chemicals that 316 stainless steel can.

Black-Oxide 18-8 Stainless Steel—Typically chosen for their appearance, these nuts have a dark, matte coating to create a finished look. They resist rust in wet and outdoor environments, but won't hold up to the harsh chemicals that 316 stainless steel can.

						Each
	Thread Size	Lg., mm	Wd., mm	Threading		1-9	10-49	50-Up
18-8 Stainless Steel



		M2 × 0.4 mm	6	4	Fully Threaded	93590A101	00000	00000	00000


		Black-Oxide 18-8 Stainless Steel



				M2 × 0.4 mm	6	4	Fully Threaded	93590A317	0000	0000	0000

Lightweight Aluminum

6061 Aluminum—One-third the weight of steel, these nuts are commonly used in robotics, automation, and other applications that have weight limitations. They're an alternative to stainless steel for rust resistance but are not as strong.

						Each
	Thread Size	Lg., mm	Wd., mm	Threading		1-9	10-49	50-Up
6061 Aluminum



		M2 × 0.4 mm	6	4.5	Fully Threaded	90012A210	00000	00000	00000

Brass

Brass—With a warm, polished look, these nuts are often chosen for their appearance. Similar to 18-8 stainless steel, brass is corrosion resistant enough to stand up to wet environments. It is also softer than other metals, so it's easier to thread together.

						Each
	Thread Size	Lg., mm	Wd., mm	Threading		1-9	10-49	50-Up
Brass



		M2 × 0.4 mm	6	4	Fully Threaded	90465A411	000000	000000	000000

Plastic

Nylon 6/6—Slippery and abrasion resistant, these nuts thread on smoothly and stand up to daily wear and tear. Nylon will swell and weaken when exposed to moisture, so it's best for dry environments.

					Temp., ° F				Each
	Thread Size	Lg., mm	Wd., mm	Threading	Min.	Max.	Color		1-9	10-49	50-Up
Nylon 6/6



		M2 × 0.4 mm	6	4	Fully Threaded	-40	250	Off-White	1319N21	00000	00000	00000

Slotted-Drive Male-Female Round Thread Adapters

18-8 Stainless Steel—18-8 stainless steel adapters resist corrosion better than brass adapters. They also withstand wet environments.

			Thread Lg., mm		Gender		Thread Fit
	Thread Size (A)	Thread Size (B)	(A)	(B)	(A)	(B)	(A)	(B)	Hardness		Each
18-8 Stainless Steel



		M4 x 0.7 mm	M2 x 0.4 mm	6.4	6.4	Male	Female	Metric Class 6g	Metric Class 6H	Not Rated	97437A814	00000

Miniature Splined Press-Fit Threaded Standoffs

Fully

Threaded

The smallest standoffs we offer. These press into unthreaded holes to create permanent connections without welding, tapping, or installing extra hardware. The raised splines prevent rotation, and a recessed head clinches material for a strong hold. A through hole allows installation from one side, making them ideal for compact electronics like laptops and handheld devices.

Wear-Resistant 400 Series Stainless Steel—These standoffs can grind against metal surfaces without denting or scratching. More corrosion resistant than steel.

	Thread Lg., mm	For Hole Dia., mm	Specs. Met	Pkg. Qty.		Pkg.
Wear-Resistant 400 Series Stainless Steel







	M2 × 0.4 mm

	2	3.2	Fully Threaded	2	3.2	ASTM A380	25	92985A817	00000


	3	3.2	Fully Threaded	3	3.2	ASTM A380	25	92985A818	0000

High-Profile Hex Nuts

Slightly taller than standard-profile hex nuts, these have a larger gripping area so your wrench or socket won't slip off as you tighten them. They're often used in vehicles and machinery where fasteners can be difficult to reach.

Low-Strength Steel

Rated Grade 2, Class 6, or lower, these nuts are about half as strong as medium-strength nuts. They are suitable for light duty fastening applications, such as securing access panels. Use them with screws that have a similar strength rating to avoid stripping threads during installation.

Zinc-Plated Steel—A step up from plain steel, the zinc plating withstands occasional exposure to moisture.

	Wd., mm	Ht., mm	Fastener Strength Grade/Class	Pkg. Qty.		Pkg.
Zinc-Plated Steel



	M2 × 0.4 mm	4	2	Class 6	25	90725A010	000000