M36 Washers | McMaster-Carr

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.

Highly Corrosion-Resistant 316 Stainless Steel—Superior to 18-8 stainless steel, these washers won't degrade when exposed to harsh weather, salt water, and most chemicals.

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



	M36	37.0	66.0	4.4 to 5.6	DIN 125, ISO 7089	1	000000000	00000


	Highly Corrosion-Resistant 316 Stainless Steel



			M36	37.0	66.0	4.4 to 5.6	DIN 125, ISO 7089	1	000000000	0000

Steel

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

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

For Fastener Strength Grade/Class—If you require screws or nuts with a specific fastener strength rating, make sure your washer matches the grade or class.

	ID, mm	OD, mm	Thk., mm	For Fastener Strength Grade/Class	Specs. Met	Pkg. Qty.		Pkg.
Zinc-Plated Steel



	M36	37.0	66.0	4.4 to 5.6	—	DIN 125, ISO 7089	10	000000000	000000


	M36	37.0	66.0	4.4 to 5.6	ISO Class 8.8	DIN 125, ISO 7089	1	000000000	0000


	Steel



			M36	39.0	66.0	4.0 to 6.0	—	DIN 126, ISO 7091	1	000000000	0000

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

Black-Oxide Steel—Typically chosen for their appearance, these washers have a dark, matte coating that creates a finished look. They offer minimal corrosion resistance, so they're best for dry environments.

Blue-Dyed Steel—These metric-sized washers have a distinctive blue color, so you can easily tell them apart from inch washers. The coating provides only minimal corrosion resistance, so these washers are best for dry environments.

	ID, mm	OD, mm	Thk., mm	Pkg. Qty.		Pkg.
Black-Oxide Steel



	M36	37.0	50.0	7.0 to 7.9	1	000000000	00000


	Blue-Dyed Steel



			M36	39.3	70.0	3.9 to 4.3	1	000000000	00000

Structural Washers

Distribute pressure under structural screws and nuts in columns, joists, and I-beams. These thick washers are tested and certified to meet industry standards for handling high-stress loads.

Steel

Image of Product. Front orientation. Washers. Structural Washers.

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

For Fastener Strength Grade/Class—If you require screws or nuts with a specific fastener strength rating, make sure your washer matches the grade or class.

	ID, mm	OD, mm	Thk., mm	For Fastener Strength Grade/Class	Specs. Met	Pkg. Qty.		Pkg.
Steel



	M36	37.0	66.0	5.4 to 6.6	ISO Class 10.9	DIN 6916, ISO 7416	1	000000000	000000

Plastic Washers

All of these washers are lightweight, nonconductive, and naturally rust resistant. They are commonly used in electronics and automation applications to take the pressure off screws and nuts and protect mounting surfaces.

Moisture-Resistant Delrin® Acetal—The best plastic for damp and wet environments, these washers won't swell or lose their strength if exposed to moisture.

Chemical-Resistant High-Temperature PTFE—The most chemical-resistant plastic washers we offer, these stand up to the widest range of harsh acids, bases, solvents, and corrosive cleaners, even at temperatures up to 500° F. Their slippery surface reduces friction between the washer, fastener, and mounting surface to prevent sticking when tightening and loosening. They are also good electrical insulators.

					Temp. Range
	For Screw Size	ID, mm	OD, mm	Thk., mm	Min.	Max., ° F	Color	Pkg. Qty.		Pkg.
Moisture-Resistant Delrin® Acetal



		M36	37.0	66.0	2.2 to 2.6	Not Rated	180	White	1	000000000	00000


		Chemical-Resistant High-Temperature PTFE



				M36	37.0	66.0	1.4 to 1.8	Not Rated	500	White	1	000000000	0000

Tension-Indicating Structural Washers

Fasten structural screws and nuts securely without overtightening. When you see orange dye, you'll know you've applied the correct tension, so you don't accidentally strip threads. These washers distribute pressure under fasteners in columns, joists, and I-beams. They are tested and certified to meet industry standards for handling high-stress loads.

Steel

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

Corrosion-Resistant Galvanized Steel—These washers combine the strength of steel with the rust resistance of stainless steel. They're an economical alternative to 18-8 stainless steel in wet and outdoor environments, but they won't hold up to salt water and chemicals.

For Fastener Strength Grade/Class—If you require screws or nuts with a specific fastener strength rating, make sure your washer matches the grade or class.

	ID, mm	OD, mm	Thk., mm	For Fastener Strength Grade/Class	Specs. Met	Pkg. Qty.		Pkg.
Zinc-Plated Steel



	M36	37.7	70.4	4.8 to 7.5	ISO Class 10.9	ASME B18.2.6M, ASTM F959	1	000000000	00000


	Corrosion-Resistant Galvanized Steel



			M36	37.7	70.4	4.8 to 7.5	ISO Class 8.8	ASME B18.2.6M, ASTM F959	1	000000000	0000

Sealing Washers

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.

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



	M36	36.300	41.900	1.8 to 2.2	DIN 7603	5	000000000	000000


	M36	36.300	43.900	1.8 to 2.2	DIN 7603	1	000000000	00000


	Cellulose-Filled Copper



			M36	36.300	41.900	2.3 to 2.7	DIN 7603	5	000000000	00000


			Aluminum



					M36	39.000	47.500	2.8 to 3.2	—	5	000000000	00000

Undersized Washers

These washers distribute pressure evenly under fasteners with narrow heads, such as cheese and socket head screws. They have smaller diameters than general purpose washers of the same screw size.

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	Pkg. Qty.		Pkg.
18-8 Stainless Steel



	M36	37.0	50.0	4.5 to 5.4	1	000000000	000000

Steel

	ID, mm	OD, mm	Thk., mm	Pkg. Qty.		Pkg.
Black-Oxide Steel



	M36	37.0	50.0	4.5 to 5.4	5	000000000	000000

Heavy-Vibration-Resistant Spring Lock Washers for Socket Head Screws

Stop socket head screws from wiggling loose on equipment with constant, vigorous vibration, such as engines, turbines, and generators. These washers have a small diameter to fit under screws with narrow heads. Similar to a spring, they flatten under pressure to add tension between mating surfaces. As long as the washers aren't deformed or otherwise damaged, you can reuse them indefinitely without losing locking strength. Also known as conical washers and Belleville washers.

Stack multiple washers in the same direction to double or triple how much weight they can bear. Stack washers in opposite directions for better deflection, which means they compress further and withstand more shock and movement without loosening.

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

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

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

Top-and-Bottom Serration—Adds friction for extra gripping power.

	ID	OD	Thk.	Overall Ht.	Serration Location	Pkg. Qty.		Pkg.
18-8 Stainless Steel



	1 3/8", M36	1.496"	2.126"	0.118"	0.185"	Top and Bottom	1	000000000	000000


	Zinc-Plated Steel



			1 3/8", M36	1.496"	2.126"	0.098"	0.165"	Top and Bottom	1	000000000	0000


			Steel



					1 3/8", M36	1.496"	2.126"	0.098"	0.165"	Top and Bottom	5	000000000	00000

Extreme-Vibration-Resistant Wedge Lock Washers

When it's critical to keep bolted assemblies secure, choose these two-piece lock washers with the tightest grip of all. They stop nuts and screws from loosening in heavy machinery that experiences jarring starts and stops, such as compressors and compactors. Serrations on the outside bite into the fastener and mating surfaces, while wedges on the inside lock the two pieces together. When the nut or screw starts to loosen, the wedges drive more tightly together to maintain tension. You can reuse these washers up to fifteen times, as long as the serrations and wedges are not worn down. They are comparable to NORD-LOCK® or Sherex TEC® washers.

Wedge Lock

Highly Corrosion-Resistant 316 Stainless Steel—Superior to 18-8 stainless steel, these washers won't degrade when exposed to harsh weather, salt water, and most chemicals.

Highly Corrosion-Resistant Zinc-Flake-Coated Steel—With 40 times the corrosion resistance of zinc-plated steel, these withstand rust as well as 316 stainless steel. They have been tested to extreme standards, including 1,000 hours of salt spray. They are similar to Magni-coated washers.

	ID	OD	Thk.	Pkg. Qty.		Pkg.
Highly Corrosion-Resistant 316 Stainless Steel



	1 3/8", M36	1.470"	2.170"	0.260" to 0.280"	1	000000000	000000


	Highly Corrosion-Resistant Zinc-Flake-Coated Steel



			1 3/8", M36	1.470"	2.170"	0.250" to 0.270"	1	000000000	00000

Split Lock Washers

Stop nuts and screws from loosening due to mild vibration. As you tighten, the uneven ends bite into the nut or screw so it won't back out. While they're not as vibration resistant as other lock washers, they are a great fit for electrical panels, light fixtures, and other light duty assemblies. Split lock washers are not reusable, and they only work with fasteners that have right-hand threads.

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

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

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



	M36	37.7	58.2	5.8 to 6.2	DIN 127B	1	000000000	00000


	Zinc-Plated Steel



			M36	37.7	58.2	5.8 to 6.2	DIN 127B	5	000000000	00000


			Steel



					M36	37.7	58.2	5.8 to 6.2	DIN 127B	1	000000000	0000

Split Lock Washers for Socket Head Screws

Stop socket head screws from loosening due to mild vibration. These washers have a small diameter to fit under screws with narrow heads, but are still thick enough to keep fasteners secure. While they're not as vibration resistant as other lock washers, they are a great fit for electrical panels, light fixtures, and other light duty assemblies. Split lock washers are not reusable, and they only work with fasteners that have right-hand threads. Also known as high-collar lock washers.

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



	M36	37.7	52.2	6.7 to 7.3	DIN 7980	1	000000000	00000


	Black-Oxide Steel



			M36	37.7	52.2	6.7 to 7.3	DIN 7980	1	000000000	0000