0.4 mm Shims | McMaster-Carr

Cut into custom shapes to create shims that suit your needs. With thickness tolerances as fine as a strand of hair, the shims will precisely align, space, and level components on dies, presses, and machinery.

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 areas because it resists rust. However, it will corrode or pit when exposed to salt water and chemicals.

Carbon Steel—Best for dry areas since moisture will cause it to rust.

Temper Rating—Choose half hard to create shims that you’ll need to bend or shape. Opt for full hard to make stronger shims that will maintain their shape under loads.

				Certificate
	Thk., mm	Thk. Tolerance, mm	Temper Rating	Type	Form	Specs. Met	Form		Each
18-8 Stainless Steel





				150 mm Wide × 1,250 mm Long
				0.4	-0.02 to 0.02	Full Hard	Material Certificate	Paper	ASTM A666	Roll	00000000	000000

				Carbon Steel





								150 mm Wide × 2,500 mm Long
								0.4	-0.02 to 0.02	Full Hard	Material Certificate	Paper	ASTM A109, Fed. Spec. QQ-S-698	Roll	00000000	00000

Slotted Shims

Image of ProductInUse. Front orientation. Shims. Precision Adjust, Slot, Sold Individually.

Tab End

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.

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)
				0.4	-0.032 to 0.032	M15	15.9	25.4	Rockwell C40	Labeled	Tab	00000000	00000	000000000	00000



						75 mm Lg. × 75 mm Wd. (Shim Trade Size B)
						0.4	-0.032 to 0.032	M22	22.3	38.1	Rockwell C40	Labeled	Tab	00000000	0000	00000000	0000



								100 mm Lg. × 100 mm Wd. (Shim Trade Size C)
								0.4	-0.032 to 0.032	M30	31.8	50.8	Rockwell C40	Labeled	Tab	00000000	0000	00000000	0000



										125 mm Lg. × 125 mm Wd. (Shim Trade Size D)
										0.4	-0.032 to 0.032	M40	41.3	84.1	Rockwell C40	Labeled	Tab	00000000	00000	———	0

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.

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.

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.

DIN 432—These washers have a small tab that presses up against the flats of your nut or screw for extra security.

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


	M2	2.2	5.0	0.4	0.6	DIN 6796	50	000000000	000000

	Super-Corrosion-Resistant 316 Stainless Steel


			M2	2.2	5.0	0.4	0.6	DIN 6796	25	000000000	00000
			M4	4.3	14.0	0.4	2.0	DIN 432	50	000000000	00000

			High-Strength 17-7 PH Stainless Steel


					M4	4.2	8.0	0.4	0.8	—	25	000000000	00000

					Zinc-Plated Steel


							M2	2.2	5.0	0.4	0.6	DIN 6796	100	000000000	00000

							Phosphate-Coated Steel


									M2	2.2	5.0	0.4	0.6	DIN 6796	100	000000000	00000

									Steel


											M2	2.2	5.0	0.4	0.6	DIN 6796	100	000000000	0000
											M4	4.3	14.0	0.4	2.0	DIN 432	10	000000000	00000

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.

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


	M3	3.2	6.0	0.4	1.3	DIN 137A	100	000000000	00000

	Zinc-Plated Steel


			M3	3.2	6.0	0.4	1.3	DIN 137A	100	000000000	0000
			M3.5	3.7	7.0	0.4	1.4	DIN 137A	100	000000000	0000

Tab Lock Washers

1 Tab

Instead of relying on friction, these washers lock mechanically for more holding power than split and tooth lock washers. Bend the tabs with a wrench to stop both the fastener and washer from rotating. They are often used in applications with moderate vibration, such as motors, mixers, and pumps. These washers are not reusable because the tabs will weaken if you bend them repeatedly.

1 Tab—Bend the tab down over the edge of your mounting surface, and bend the side of the washer up against the nut or screw.

	ID, mm	OD, mm	Thk., mm	No. of Tabs	Specs. Met	Pkg. Qty.		Pkg.
18-8 Stainless Steel


	M4	4.3	14.0	0.4	1	DIN 93	100	000000000	000000