0.7 mm Shims | McMaster-Carr

Slip these shims around existing mounting fasteners to precisely align and level components such as pumps, compressors, and gearboxes with motors, all without disassembling them. They’re also good for leveling machines on uneven surfaces. To reduce sizing errors, these shims are either labeled with their thickness so there's no need to measure or color coded by thickness to quickly spot the right size.

You can stack multiple shims to achieve your exact thickness, but stacking more than four may cause them to shift. Remember, fewer shims are better, so a couple of thicker shims are more stable than a bunch of thin shims.

18-8 Stainless Steel—The choice for wet and outdoor environments, these shims resist rust. However, they’ll corrode or pit when exposed to salt water and chemicals.

Insertion Tools—Ease shim insertion and removal, keeping your fingers clear in the process.

	Shims										Insertion Tools
				Slot, mm
	Thk., mm	Thk. Tolerance, mm	For Max. Screw Size	Wd.	Dp.	Min. Hardness	Identification Type	End Shape		Each		Each
18-8 Stainless Steel





				50 mm Lg. × 50 mm Wd. (Shim Trade Size A)
				0.7	-0.032 to 0.032	M15	15.9	25.4	Rockwell B70	Labeled	Tab	00000000	00000	000000000	00000



						75 mm Lg. × 75 mm Wd. (Shim Trade Size B)
						0.7	-0.032 to 0.032	M22	22.3	38.1	Rockwell B70	Labeled	Tab	00000000	0000	00000000	0000



								100 mm Lg. × 100 mm Wd. (Shim Trade Size C)
								0.7	-0.032 to 0.032	M30	31.8	50.8	Rockwell B70	Labeled	Tab	00000000	00000	00000000	0000



										125 mm Lg. × 125 mm Wd. (Shim Trade Size D)
										0.7	-0.032 to 0.032	M40	41.3	84.1	Not Rated	Labeled	Tab	00000000	00000	———	0

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.

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.

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.
18-8 Stainless Steel


	M4	1	4.4	7.6	0.7	1.4	DIN 128B	50	000000000	000000

	Zinc-Plated Steel


			M4	1	4.1	7.6	0.7	1.2	DIN 128B	100	000000000	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.

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.

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


	M4	4.1	7.6	0.7	1.2	DIN 128A	100	000000000	00000

	Zinc-Plated Steel


			M4	4.1	7.6	0.7	1.2	DIN 128A	100	000000000	0000

			Zinc-Yellow-Chromate-Plated Steel


					M4	4.1	7.6	0.7	1.2	DIN 128A	100	000000000	0000

					Black-Oxide Steel


							M4	4.1	7.6	0.7	1.2	DIN 128A	100	000000000	0000

							Steel


									M3	2.7	5.6	0.7	1.3	DIN 6905	200	000000000	0000