2.50 mm Shims | McMaster-Carr

18-8 Stainless Steel—18-8 stainless steel washers have good chemical resistance and may be mildly magnetic. These washers are the most corrosion-resistant option.

Zinc-Plated Steel—Zinc-plated steel washers are coated for corrosion resistance in wet environments.

Galvanized Steel—Galvanized steel washers are ten times more corrosion resistant than zinc-plated washers.

				Thk., mm
	For Screw Size	ID, mm	Wd., mm	(A)	(B)	Hardness	Specs. Met	Pkg. Qty.		Pkg.
18-8 Stainless Steel


		M16	18.0	32.0	7.5	2.5	Rockwell B52	DIN 435	1	000000000	00000

		Zinc-Plated Steel


				M16	18.0	32.0	7.5	2.5	Rockwell B52	DIN 435	10	000000000	00000

				Galvanized Steel


						M16	18.0	32.0	7.5	2.5	Rockwell B52	DIN 435	5	000000000	00000

Leveling Washers for U-Channels

Tapered to fit in a U-channel, these washers create a parallel bearing surface.

Zinc-Plated Steel—Zinc-plated steel washers are coated for corrosion resistance in wet environments.

					Thk., mm
	For Screw Size	ID, mm	Lg., mm	Wd., mm	(A)	(B)	Hardness	Specs. Met	Pkg. Qty.		Pkg.
Zinc-Plated Steel


		M12	14.0	30.0	26.0	4.9	2.5	Rockwell B56	DIN 434	5	000000000	00000

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.

High-Strength Glass-Filled Nylon—Stronger than plain nylon, but not quite as strong as PEEK. These washers will swell and weaken when exposed to moisture, so they are best for dry environments.

					Temp. Range
	For Screw Size	ID, mm	OD, mm	Thk., mm	Min.	Max., ° F	Color	Pkg. Qty.		Pkg.
High-Strength Glass-Filled Nylon


		M12	13	24	2.5	Not Rated	220	White	5	000000000	000000

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.

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	Specs. Met	Pkg. Qty.		Pkg.
Blue-Dyed Steel


	M8	8.2	15.2	2.5	ASME B18.21.2M	100	000000000	00000

Heavy-Vibration-Resistant Spring Lock Washers

With a grip that's second only to wedge lock, these washers stop nuts and screws from wiggling loose under constant, vigorous vibration. They are ideal for engines, turbines, generators, and other heavy duty equipment. 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.

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

Super-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.

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

Phosphate-Coated Steel—Paint adheres evenly to the surface of these washers, so you can add your own decorative finish. They are more durable than zinc-plated steel washers to withstand wet and outdoor environments. However, they won't hold up to the harsh chemicals that stainless steel can.

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

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


	M10	10.5	23.0	2.5	3.2	DIN 6796	10	000000000	00000

	Black-Oxide 18-8 Stainless Steel


			M10	10.5	23.0	2.5	3.2	DIN 6796	5	000000000	00000

			Super-Corrosion-Resistant 316 Stainless Steel


					M10	10.5	23.0	2.5	3.2	DIN 6796	1	000000000	0000

					Zinc-Plated Steel


							M10	10.5	23.0	2.5	3.2	DIN 6796	10	000000000	00000

							Phosphate-Coated Steel


									M10	10.5	23.0	2.5	3.2	DIN 6796	10	000000000	00000

									Steel


											M10	10.5	23.0	2.5	3.2	DIN 6796	10	000000000	0000