M26 Spacers | McMaster-Carr

Prevent leaks while distributing weight evenly under nuts and screws. These washers compress as you tighten to keep air and fluid in, and dust and contaminants out. Use them anywhere you need a tight seal, such as protecting electronics from moisture or keeping lubricants contained in machinery.

Rubber

Resist leaks better than metal sealing washers, but are more susceptible to wear and tear. Reuse these washers a handful of times, as long as the material isn't damaged.

Weather-Resistant EPDM—The best choice for outdoor use, these washers withstand long-term exposure to sunlight, rain, and ozone. However, they can't handle oil, grease, or fuel like Buna-N washers can.

					Temp. Range, ° F
	For Screw Size	ID, mm	OD, mm	Thk., mm	Min.	Max.	Color	Food Industry Std.	Pkg. Qty.		Pkg.
Weather-Resistant EPDM



		M26	27.000	50.000	1.190 to 1.950	-50	300	White	FDA Compliant 21 CFR 177.2600	5	000000000	000000

Metal

Also known as crush washers, these are made of soft metal that deforms under pressure to fill gaps around the nut or screw. Often found in oil drain valves, they withstand stress and wear better than plastic and rubber washers, but aren't as leak-resistant. Metal sealing washers are not reusable.

Copper—Softer than aluminum washers, these deform easily to create a tight seal with less effort. They resist rusting in corrosive environments, but will develop a green patina over time.

Cellulose-Filled Copper—The easiest washers to crush. These washers are embedded with cellulose, which makes them more flexible than other metal washers for a tighter seal. They resist rusting in corrosive environments, but will develop a green patina over time.

Aluminum—These washers are an economical alternative to copper. They have similar corrosion resistance but require more effort to crush.

	ID, mm	OD, mm	Thk., mm	Specs. Met	Pkg. Qty.		Pkg.
Copper



	M26	26.300	31.900	1.8 to 2.2	DIN 7603	5	000000000	000000


	Cellulose-Filled Copper



			M26	26.300	30.900	2.3 to 2.7	DIN 7603	10	000000000	00000


			M26	26.300	31.900	2.3 to 2.7	DIN 7603	10	000000000	00000
			M26	26.300	33.900	2.3 to 2.7	DIN 7603	10	000000000	00000


			Aluminum



					M26	26.300	31.900	1.8 to 2.2	DIN 7603	10	000000000	00000

Oversized Washers

These washers have exaggerated diameters to cover large holes and to compensate for uneven mounting surfaces. They are also thicker than general purpose washers, so they bridge wide gaps when used as spacers.

Steel

Steel—Best for dry environments since moisture will cause these washers to rust.

	ID, mm	OD, mm	Thk., mm	Specs. Met	Pkg. Qty.		Pkg.
Steel



	M26	26.0	40.0	4.4 to 5.6	DIN 1440, ISO 8738	5	000000000	00000

General Purpose Washers

Your go-to metal washer for every screw size. Washers take the pressure off nuts and screws to protect mounting surfaces.

Stainless Steel About Stainless Steel

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

	ID, mm	OD, mm	Thk., mm	Specs. Met	Pkg. Qty.		Pkg.
18-8 Stainless Steel



	M26	27.0	50.0	3.7 to 4.3	DIN 125	1	000000000	00000

Steel

Zinc-Plated Steel—A common choice for areas with occasional exposure to moisture.

	ID, mm	OD, mm	Thk., mm	Specs. Met	Pkg. Qty.		Pkg.
Zinc-Plated Steel



	M26	27.0	50.0	3.7 to 4.3	DIN 125	1	000000000	00000