3.00 mm Shims | McMaster-Carr

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



		M16	17	30	3	Not Rated	220	White	1	000000000	00000

Leveling Washers for I-Beams


Mounted on an I-Beam

Commonly called beveled washers, these are tapered to fit inside an I-beam's flange to provide a parallel bearing surface.

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



		M20	22.0	40.0	9.2	3.0	Rockwell B52	DIN 435	1	000000000	000000


		M24	26.0	56.0	10.8	3.0	Rockwell B52	DIN 435	1	000000000	00000


		Zinc-Plated Steel



				M20	22.0	40.0	9.2	3.0	Rockwell B52	DIN 435	5	000000000	00000


				M24	26.0	56.0	10.8	3.0	Rockwell B52	DIN 435	1	000000000	0000


				Galvanized Steel



						M20	22.0	40.0	9.2	3.0	Rockwell B52	DIN 435	1	000000000	0000


						M24	26.0	56.0	10.8	3.0	Rockwell B52	DIN 435	1	000000000	0000

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



		M16	18.0	36.0	32.0	5.9	3.0	Rockwell B56	DIN 434	5	000000000	000000

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.

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.

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



	M12	13.0	29.0	3.0	4.0	DIN 6796	10	000000000	00000


	Black-Oxide 18-8 Stainless Steel



			M12	13.0	29.0	3.0	4.0	DIN 6796	5	000000000	00000


			Highly-Corrosion-Resistant 316 Stainless Steel



					M12	13.0	29.0	3.0	4.0	DIN 6796	1	000000000	0000


					Zinc-Plated Steel



							M12	13.0	29.0	3.0	4.0	DIN 6796	5	000000000	00000


							Phosphate-Coated Steel



									M12	13.0	29.0	3.0	4.0	DIN 6796	10	000000000	00000


									Steel



											M12	13.0	29.0	3.0	4.0	DIN 6796	10	000000000	00000

Bearing Spring Lock Washers for Slotted Bearing Nuts


	For Chamfered Nuts

Designed for use with bearing nuts, these lock washers have a conical shape that presses like a spring against bearings, bushings, gears, and pulleys to hold them in place on your threaded shaft or spindle. They also have an inner tab that sits in the shaft or spindle’s keyway to prevent the nut from loosening.

Steel—Steel washers are strong and flexible.

External Tooth—Washers with external teeth grip components using their teeth, in addition to spring tension.

DIN 5406—DIN 462 and DIN 5406 washers meet international standards for lock washer dimensions. Pair DIN 462 washers with DIN 1804 bearing nuts, and DIN 5406 washers with DIN 981 bearing nuts.

					Tab, mm
	For Screw Size	ID, mm	OD, mm	Thk., mm	Wd.	Dp.	Overall Ht., mm	Tooth Location	Hardness	Specs. Met	For Bearing Nut Specs. Met		Each
For Chamfered Nuts







				Steel

				M220	220.000	292.000	3.000	24.000	7.000	13.000	External	Not Rated	DIN 5406	DIN 981	000000000	0000000

Curved Spring Lock Washers

The curvy, spring-like shape adds a small amount of tension to prevent nuts and screws from backing out due to mild vibration. These washers also flex slightly to compensate for uneven surfaces. While more secure than a standard flat washer, these have the least amount of gripping power of all our lock washers. They are best suited for electrical panels, light fixtures, and other light duty assemblies. These washers hold their shape when untightened, so you can reuse them a handful of times without losing strength.

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

Zinc-Yellow-Chromate-Plated Steel—With the same corrosion resistance as zinc-plated steel, these withstand occasional exposure to moisture.

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.

DIN 128A—These washers have split ends that bite into your material surface for a tighter hold than other curved washers.

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



	M20	20.2	33.6	3.0	5.1	DIN 128A	10	000000000	000000


	M22	22.5	35.9	3.0	5.1	DIN 128A	5	000000000	00000


	Zinc-Plated Steel



			M20	20.2	33.6	3.0	5.1	DIN 128A	10	000000000	00000


			M22	22.5	35.9	3.0	5.1	DIN 128A	10	000000000	00000


			Zinc-Yellow-Chromate-Plated Steel



					M20	20.2	33.6	3.0	5.1	DIN 128A	10	000000000	00000


					Black-Oxide Steel



							M20	20.2	33.6	3.0	5.1	DIN 128A	5	000000000	0000

Wave Spring Lock Washers

The wavy shape flexes like a spring to keep nuts and screws secure on slightly uneven surfaces. These washers add a small amount of tension to stop fasteners from backing out due to mild vibration. While they don't hold as well as other lock washers, they do grip slightly better than curved washers. They work best in electrical panels, light fixtures, and other light duty assemblies. Since these washers hold their shape when untightened, you can reuse them a handful of times without losing strength.

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

DIN 128B—These washers have split ends that bite into your material surface for a tighter hold than other wave washers.

	No. of Waves	ID, mm	OD, mm	Thk., mm	Overall Ht., mm	Specs. Met	Pkg. Qty.		Pkg.
Zinc-Plated Steel



	M22	1	22.5	35.9	3.0	5.1	DIN 128B	5	000000000	00000