Bore Reducers | McMaster-Carr

	For Shaft Diameter For Shaft Diameter

1/4"

5/16"

3/8"

	OD OD

	ID ID

	Material Material

Steel

Rubber

Plastic

	Overall Width Overall Width

	Shaft Mount Type Shaft Mount Type

Set Screw

Press Fit

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	Bushing Type Bushing Type

Sleeve

Spring

	For Arbor Hole Size For Arbor Hole Size

	Reduced Arbor Hole Size Reduced Arbor Hole Size

	Set Screw Hole Diameter Set Screw Hole Diameter

3/8"

7/16"

	For Use With For Use With

Grinders for Bits and Burs

Hand-Held Power Drills

	Arbor Hole Size Arbor Hole Size

	Arbor Hole Shape Arbor Hole Shape


Round	Diamond

	For Holding For Holding

Flap Sanding Wheels

Wheel Brushes

	For Shank Diameter For Shank Diameter

1/2"

5/8"

3/4"

	For Wheel Thickness For Wheel Thickness

1/2"

3/4"

	Thickness Thickness

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92 Products

Light Duty Sleeve Bushings

Reduce the ID of sprockets, pulleys, and gears in low-torque applications. Bushings have a hole for a set screw.

For technical drawings and 3-D models, click on a part number.

For Shaft Dia.	OD	Overall Wd.	Set Screw Hole Dia.	Material		Each
1/4"	1/2"	1 1/8"	3/8"	Steel	0000000	00000
5/16"	1/2"	1 1/8"	3/8"	Steel	0000000	0000
3/8"	1/2"	1 1/8"	3/8"	Steel	0000000	0000
7/16"	1/2"	1 1/8"	3/8"	Steel	0000000	00000
1/2"	5/8"	1 1/8"	3/8"	Steel	0000000	0000
1/2"	3/4"	1 1/4"	7/16"	Steel	0000000	0000
5/8"	3/4"	1 1/4"	3/8"	Steel	0000000	0000
5/8"	1"	1 1/4"	7/16"	Steel	0000000	0000
3/4"	1"	1 1/4"	7/16"	Steel	0000000	0000
7/8"	1"	1 1/4"	7/16"	Steel	0000000	0000

Self-Adjusting Spring Bushings

A toothed slot lets these bushings contract for insertion into the bore of your sprocket or pulley and then expand for a snug fit. Made of spring steel, they flex under stress and shock and can handle oscillating or slow rotational motion.

For technical drawings and 3-D models, click on a part number.

For 1/2" Shaft Diameter
OD	Overall Wd.	Material		Each
3/4"	1/2"	Steel	00000000	000000
3/4"	3/4"	Steel	00000000	00000
3/4"	1"	Steel	00000000	00000
For 3/4" Shaft Diameter
1"	1/2"	Steel	00000000	0000
1"	3/4"	Steel	00000000	0000
1"	1"	Steel	00000000	0000
1"	1 1/4"	Steel	00000000	0000
1"	1 1/2"	Steel	00000000	0000
1"	2"	Steel	00000000	0000
For 1" Shaft Diameter
1 1/4"	1/2"	Steel	00000000	0000
1 1/4"	5/8"	Steel	00000000	0000
1 1/4"	3/4"	Steel	00000000	0000
1 1/4"	7/8"	Steel	00000000	0000
1 1/4"	1"	Steel	00000000	0000
1 1/4"	1 1/4"	Steel	00000000	0000
1 1/4"	1 1/2"	Steel	00000000	00000
1 1/4"	2"	Steel	00000000	00000
For 1 1/8" Shaft Diameter
1 3/8"	3/4"	Steel	00000000	00000
1 3/8"	1"	Steel	00000000	00000
1 3/8"	1 1/2"	Steel	00000000	00000
For 1 1/4" Shaft Diameter
1 1/2"	1/2"	Steel	00000000	0000
1 1/2"	3/4"	Steel	00000000	0000
1 1/2"	1"	Steel	00000000	0000
1 1/2"	1 1/4"	Steel	00000000	0000
1 1/2"	1 1/2"	Steel	00000000	00000
1 1/2"	2"	Steel	00000000	00000
1 1/2"	2 1/2"	Steel	00000000	00000
1 1/2"	3"	Steel	00000000	00000
For 1 3/8" Shaft Diameter
1 3/4"	1 1/4"	Steel	00000000	00000
1 3/4"	1 1/2"	Steel	00000000	00000
1 3/4"	2"	Steel	00000000	00000

For 1 1/2" Shaft Diameter
OD	Overall Wd.	Material		Each
1 3/4"	1/2"	Steel	00000000	00000
1 3/4"	3/4"	Steel	00000000	0000
1 3/4"	1"	Steel	00000000	0000
1 3/4"	1 1/4"	Steel	00000000	0000
1 3/4"	1 1/2"	Steel	00000000	00000
1 3/4"	2"	Steel	00000000	00000
1 3/4"	2 1/2"	Steel	00000000	00000
1 3/4"	2 3/4"	Steel	00000000	00000
For 1 3/4" Shaft Diameter
2"	1"	Steel	00000000	00000
2"	1 1/4"	Steel	00000000	00000
2"	1 1/2"	Steel	00000000	00000
For 2" Shaft Diameter
2 1/4"	1 1/2"	Steel	00000000	00000
2 1/4"	2"	Steel	00000000	00000
2 1/4"	2 1/2"	Steel	00000000	00000
2 1/2"	1"	Steel	00000000	00000
2 1/2"	1 1/2"	Steel	00000000	00000
2 1/2"	2"	Steel	00000000	00000
2 1/2"	2 1/2"	Steel	00000000	00000
2 1/2"	3"	Steel	00000000	00000
For 2 1/2" Shaft Diameter
3"	1"	Steel	00000000	00000
3"	1 1/2"	Steel	00000000	00000
3"	2"	Steel	00000000	00000
3"	2 1/2"	Steel	00000000	00000
3"	3"	Steel	00000000	00000
For 3" Shaft Diameter
3 1/2"	1"	Steel	00000000	00000
3 1/2"	1 1/2"	Steel	00000000	00000
3 1/2"	2"	Steel	00000000	00000
3 1/2"	2 1/2"	Steel	00000000	00000
3 1/2"	3"	Steel	00000000	00000

Arbor Hole Reducers for Arbor-Mount Flap Sanding Wheels

Reduce the arbor hole size on a flap sanding wheel so that it fits the shaft on your tool. These reducers come in pairs. To install, snap a reducer into the arbor hole on both sides of the sanding wheel.

For technical drawings and 3-D models, click on a part number.

For Arbor Hole Size	Choose a Reduced Arbor Hole Size		Pair
1"	3/8", 1/2", 5/8", 3/4", 7/8"	00000000	00000
1 3/4"	3/4", 1", 1 1/4"	00000000	00000

Arbor Hole Reducers for Wheel Brushes

Reduce the arbor hole size of a wheel brush so that it fits the shaft of your tool.

Steel reducers come in pairs. To install, snap a reducer into the arbor hole on both sides of the wheel brush.

Steel

For Arbor Hole Size	Reduced Arbor Hole Size	For Max. Wheel Brush Thick.		Pair
2"	1/2"	2"	0000000	00000
2"	5/8"	2"	0000000	0000
2"	3/4"	2"	0000000	0000
2"	7/8"	2"	0000000	0000
2"	1"	2"	0000000	0000
2"	1 1/4"	2"	0000000	0000
2"	1 1/2"	2"	0000000	0000

Plastic

For Arbor Hole Size	Reduced Arbor Hole Size	Pkg. Qty.		Pkg.
1/2"	3/8"	12	0000000	00000
5/8"	1/2"	12	0000000	0000

Reducer Bushings for Bench and Pedestal Grinding Wheels

Insert these bushings into the arbor hole of your grinding wheel to attach wheels to smaller diameter shanks.

The smallest shank diameter size listed is the smallest allowed for that size wheel.

For Arbor Hole Size	For Shank Dia.	For Wheel Thick.	Material		Each
1"	1/2", 5/8", 3/4"	1/2"	Urethane	00000000	00000
1"	1/2", 5/8", 3/4"	3/4"	Urethane	00000000	0000
1 1/4"	5/8", 3/4", 1"	1"	Urethane	00000000	0000

Circular Saw Blade Arbor Reducer Bushings

Reduce the diameter of a blade's arbor hole to fit your saw's arbor. These bushings mount to the arbor hole of a circular saw blade. Do not use more than one bushing per blade.

For technical drawings and 3-D models, click on a part number.

Arbor Hole Size	Arbor Hole Shape	Thick.	Material		Each
5/8" to 1/2"	Round	0.056"	Steel	00000000	00000
3/4" to 5/8"	Round	0.061"	Steel	00000000	0000
20 mm to 5/8"	Round	0.041"	Steel	00000000	0000
1" to 20 mm	Round	0.07"	Steel	0000000	0000
1" to 3/4"	Round	0.089"	Steel	00000000	0000
1" to 5/8"	Round	0.08"	Steel	00000000	0000
1" to 7/8"	Round	0.07"	Steel	0000000	0000

Circular Saw Blade Diamond-to-Round Arbor Adapters

Convert a diamond arbor hole to a round arbor hole. These adapters mount to the arbor hole of a circular saw blade. Do not use more than one adapter per blade.

For technical drawings and 3-D models, click on a part number.

Arbor Hole Size	Thick.	Material		Each
Diamond to 5/8" Round	0.045"	Steel	0000000	00000