0.178" OD Bearings | McMaster-Carr

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5 Products

Shims for Lengthening Screw Shoulders

Image of ProductInUse. Front orientation. Contains Annotated. Shims. Round, Sold Individually, Shoulder Lengthening.

When shoulders come up short, use these shims to extend the shoulder length on your screw. Wiggle the shims over the threads and up to the existing shoulder to create the exact shoulder length you need. Use them to create more space for bearings, pulleys, and sprockets, or extend the length of travel along the shoulder.

You can stack multiple shims to achieve the exact shoulder length or space you need.

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.

Super-Corrosion-Resistant 316 Stainless Steel—Superior to 18-8 stainless steel, these shims won't degrade when exposed to harsh weather, salt water, and most chemicals.

	ID	ID Tolerance	OD	OD Tolerance	Min. Hardness	Pkg. Qty.		Pkg.
18-8 Stainless Steel





	For 3/16" Diameter Shoulder
	0.005"	-0.0005" to 0.0005"	No. 8	0.146"	0" to 0.011"	0.178"	-0.002" to 0.002"	Rockwell B70	10	000000000	000000

	Super-Corrosion-Resistant 316 Stainless Steel





					For 3/16" Diameter Shoulder
					0.005"	-0.0005" to 0.0005"	No. 8	0.146"	0" to 0.011"	0.178"	-0.002" to 0.002"	Rockwell B70	10	000000000	00000

Shims for Ball Bearing Outer Rings

Boost bearing efficiency and lifespan. Often used on motor shafts, these shims evenly distribute the load between multiple bearings by creating space between their outer rings. This prevents excessive pressure on any single bearing, maintaining proper alignment for smooth operation and reduced wear.

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.

Super-Corrosion-Resistant 316 Stainless Steel—Superior to 18-8 stainless steel, these shims won't degrade when exposed to harsh weather, salt water, and most chemicals.

Brass—With a warm, polished look, these shims are often chosen for their appearance. Similar to 18-8 stainless steel, brass is corrosion resistant enough to stand up to wet environments.

	For Bearing
	Trade No.	ID	OD	ID	ID Tolerance	OD	OD Tolerance	Min. Hardness	Choose a Thickness	Pkg. Qty.		Pkg.
18-8 Stainless Steel


		R1	0.055"	3/16"	0.123"	0" to 0.005"	0.178"	-0.005" to 0"	Rockwell B70	0.003" , 0.005" , 0.007" , 0.01" , 0.02"	25	000000000	000000

		Super-Corrosion-Resistant 316 Stainless Steel


				R1	0.055"	3/16"	0.123"	0" to 0.005"	0.178"	-0.005" to 0"	Rockwell B90	0.005" , 0.007" , 0.01" , 0.02"	10	000000000	00000

				Brass


						R1	0.055"	3/16"	0.123"	0" to 0.005"	0.178"	-0.005" to 0"	Rockwell B70	0.003" , 0.005" , 0.007" , 0.01" , 0.02"	10	000000000	0000