Concentric Bushings | McMaster-Carr

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Mounted Bearing Type

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Material

10 Products

Mounted Bearing Type

Tapped Base Mount

Mount to surfaces from the bottom through threaded holes

6 products

Four-Bolt Flange Mount

A stronger connection than two-bolt alternatives

4 products

Shaft Mount Type

Set Screw

Use set screws threaded through the bearing's inner ring to mount to a shaft

2 products

Clamp On

Instead of screws pressing directly into the shaft, the clamp tightens around it

4 products

Tapped-Base Mounted Ball Bearings

Smoother than smooth—the balls roll nearly friction-free within a sturdy housing to support shafts as they turn. These bearings mount from the bottom through threaded holes. With a narrow profile, they're a good fit for cramped spots where multiple shafts are mounted close together.

Lubricate regularly to keep your bearing in tip-top shape. These bearings come packed with grease and sealed to block out dust and contaminants.

Powder-Coated Cast Iron Housing—A rugged iron base coated in thick powder that protects against water, mild detergents, and oil. However, if the coating is scratched or chipped, the underlying iron may rust.

Set Screw—Turn the screw to lock your shaft in place. A simple, reliable choice, set screws grip tightly, but they can mar shaft surfaces.

Clamp On—Tighten the clamping screw to close the collar around your shaft for a secure, mar-free grip. The collar centers the shaft, decreasing vibration and allowing for higher speeds than set screws. Also known as concentric lock bearings.

Sealmaster—Famous for exceptional sealing, Sealmaster bearings include a signature three-part seal in the inner ring. This design blocks out gritty debris and purges old grease to extend the life of the bearing.

Misalignment Capability—Bearings compensate for as much shaft misalignment as the degree listed. This extends the life of the bearing and protects against wear if shafts are slightly askew.

	Mounted Bearings												Replacement Bearings
			Overall
	For Shaft Dia.	Ctr. Ht.	Lg.	Wd.	Dynamic Radial Load Cap., lb.	Max. Rotation Speed, rpm	Bearing Material	Bearing Seal Type	Misalignment Capability	Manufacturer		Each		Each
Powder-Coated Cast Iron Housing







				Set Screw

				25 mm	36.5 mm	76.2 mm	38.1 mm	2,800	6,350	Steel	Sealed	2°	Sealmaster	00000000	0000000	00000000	0000000




						Clamp On

						1 7/16"	1 7/8"	4 1/4"	1 7/8"	5,780	6,500	Steel	Sealed	2°	Sealmaster	00000000	000000	———	0


						1 15/16"	2 1/4"	5 1/2"	2"	7,880	5,000	Steel	Sealed	2°	Sealmaster	00000000	000000	———	0
						2"	2 1/4"	5 1/2"	2"	7,880	5,000	Steel	Sealed	2°	Sealmaster	00000000	000000	———	0
						30 mm	42.9 mm	101.6 mm	38.1 mm	4,380	5,450	Steel	Sealed	2°	Sealmaster	00000000	000000	———	0

Mounted Ball Bearings with Four-Bolt Flange

Smoother than smooth—the balls inside these bearings roll nearly friction-free. The four-bolt flange supports shafts with a stronger connection to the mounting surface than two-bolt alternatives.

Lubricate regularly to keep your bearing in tip-top shape. Bearings with seals keep lubricants in and contaminants out, and come packed with grease. Open bearings require initial lubrication and offer less protection against dust and debris.

Locknut—Tighten the nut for a strong hold that stands up to heavy vibrations without letting go. An adapter sleeve is required and sold separately.

SKF—Manufactured in Europe with a strong focus on precision. The more precise the bearing, the more efficiently it will run.

Misalignment Capability—Bearings compensate for as much shaft misalignment as the degree listed. This extends the life of the bearing and protects against wear if shafts are slightly askew.

	Mounted Bearings												Required Adapter Sleeves
		Overall, mm
	For Shaft Dia., mm	Lg.	Wd.	Flange Thk., mm	Dynamic Radial Load Cap., lb.	Max. Rotation Speed, rpm	Bearing Material	Bearing Seal Type	Misalignment Capability	Manufacturer		Each		Each
Powder-Coated Cast Iron Housing







				Locknut

				25	108	40.5	13	4,350	6,300	Steel	Sealed	1.5°	SKF	0000000	0000000	00000000	000000


				45	143	53.1	15	7,850	4,000	Steel	Sealed	1.5°	SKF	0000000	000000	00000000	00000