0.6 mm Shims | McMaster-Carr

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.

High-Strength 17-7 PH Stainless Steel—The strongest stainless steel washers we offer, these are comparable to high-strength Grade 8 steel. They won’t rust in wet and outdoor environments, but they can’t handle the harsh chemicals that 316 stainless steel can.

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



	M3	3.2	7.0	0.6	0.9	DIN 6796	100	91477A121	00000


	Black-Oxide 18-8 Stainless Steel



			M8	8.2	16.0	0.6	1.1	—	5	91235A616	0000


			Highly Corrosion-Resistant 316 Stainless Steel



					M3	3.2	7.0	0.6	0.9	DIN 6796	25	93237A102	00000


					High-Strength 17-7 PH Stainless Steel



							M3	3.2	7.0	0.6	0.9	—	10	91235A313	00000


							Zinc-Plated Steel



									M3	3.2	7.0	0.6	0.9	DIN 6796	100	95221A103	00000


									Phosphate-Coated Steel



											M3	3.2	7.0	0.6	0.9	DIN 6796	100	95221A201	00000


											Steel



													M3	3.2	7.0	0.6	0.9	DIN 6796	100	93497A120	0000

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.

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

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



	M3	3.1	6.2	0.6	1.1	DIN 128A	100	97093A139	00000


	Zinc-Plated Steel



			M3	3.1	6.2	0.6	1.1	DIN 128A	100	97093A123	0000


			Zinc-Yellow-Chromate-Plated Steel



					M3	3.1	6.2	0.6	1.1	DIN 128A	100	96982A136	0000


					M3.5	3.6	6.7	0.6	1.1	DIN 128A	100	96982A137	0000


					Steel



							M2.5	2.3	4.6	0.6	1.1	DIN 6905	200	91169A311	0000


							M3	3.1	6.2	0.6	1.1	DIN 128A	100	97093A111	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



	M3	1	3.1	6.2	0.6	1.1	DIN 128B	100	97093A155	00000