Bore Reducers

Filter by

System of Measurement

Inch

Metric

Shaft Diameter

Bore Diameter

Length

Material

Shaft Mount Type

Width

RoHS

REACH

DFARS Specialty Metals

Overall Width

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Yes

Export Control Classification Number (ECCN)

Flange OD

Maximum Rotation Speed

5,000 rpm

10,000 rpm

Maximum Torque

Less than 1,000 in·lbf

1,000 in·lbf to 1,999 in·lbf

2,000 in·lbf to 3,999 in·lbf

4,000 in·lbf or greater

Rotation Speed

Thread Size

Thickness

Performance

Flange Thickness

Bushing Type

For Use With

Grinders for Bits and Burs

Handheld Power Drills

Pedestal Grinder Wheels

Arbor Hole Diameter

200 Products


	With Flange

Instead of replacing your shaft or keeping components, such as couplings, with various bore diameters on hand, these reducers adapt the bore of a component to a smaller size. Slide the reducer into the bore and use your component’s set screws or clamping mechanism to secure the shaft.

Flange—Reducers with a flange prevent you from inserting them too far into the bore.

			Flange, mm
For Bore Dia.	For Shaft Dia.	Lg.	OD	Thk.	Max. Rotation Speed, rpm	Max. Torque	Material	Features		Each
1/4"	1/8"	0.221"	—	—	10,000	Not Rated	Stainless Steel	—	4239N11	000000
1/4"	3/16"	0.221"	—	—	10,000	Not Rated	Stainless Steel	—	4239N12	00000
1/4"	5 mm	0.221"	—	—	10,000	Not Rated	Stainless Steel	—	4239N13	00000
1/2"	1/4"	0.449"	—	—	10,000	Not Rated	Stainless Steel	—	4239N15	00000
1/2"	5/16"	0.449"	—	—	10,000	Not Rated	Stainless Steel	—	4239N16	00000
1/2"	3/8"	0.449"	—	—	10,000	Not Rated	Stainless Steel	—	4239N18	00000
1/2"	5 mm	0.42"	13.59	0.46	5,000	Not Rated	Aluminum	Flange	4239N39	00000
1/2"	6 mm	0.449"	—	—	10,000	Not Rated	Stainless Steel	—	4239N14	00000
1/2"	8 mm	0.449"	—	—	10,000	Not Rated	Stainless Steel	—	4239N17	00000
1/2"	10 mm	0.449"	—	—	10,000	Not Rated	Stainless Steel	—	4239N19	00000
5/8"	1/2"	0.46"	—	—	10,000	Not Rated	Stainless Steel	—	4239N23	00000
5/8"	10 mm	0.46"	—	—	10,000	Not Rated	Stainless Steel	—	4239N21	00000
5/8"	12 mm	0.46"	—	—	10,000	Not Rated	Stainless Steel	—	4239N22	00000
3/4"	3/8"	0.646"	—	—	10,000	Not Rated	Stainless Steel	—	4239N24	00000
3/4"	1/2"	0.646"	—	—	10,000	Not Rated	Stainless Steel	—	4239N26	00000
3/4"	5/8"	0.646"	—	—	10,000	Not Rated	Stainless Steel	—	4239N27	00000
3/4"	12 mm	0.646"	—	—	10,000	Not Rated	Stainless Steel	—	4239N25	00000
3/4"	16 mm	0.646"	—	—	10,000	Not Rated	Stainless Steel	—	4239N28	00000
7/8"	5/8"	0.755"	—	—	10,000	Not Rated	Stainless Steel	—	4239N29	00000
7/8"	3/4"	0.755"	—	—	10,000	Not Rated	Stainless Steel	—	4239N31	00000
1"	5/8"	0.773"	—	—	10,000	Not Rated	Stainless Steel	—	4239N32	00000
1"	3/4"	0.773"	—	—	10,000	Not Rated	Stainless Steel	—	4239N33	00000
1"	7/8"	0.773"	—	—	10,000	Not Rated	Stainless Steel	—	4239N35	00000
1"	20 mm	0.773"	—	—	10,000	Not Rated	Stainless Steel	—	4239N34	00000
1 1/4"	1"	0.793"	—	—	10,000	Not Rated	Stainless Steel	—	4239N37	00000
1 1/4"	25 mm	0.793"	—	—	10,000	Not Rated	Stainless Steel	—	4239N36	00000
10 mm	1/4"	0.32"	10.83	0.44	5,000	Not Rated	Aluminum	Flange	4239N38	00000
16 mm	1/4"	0.52"	16.88	0.46	5,000	Not Rated	Aluminum	Flange	4239N41	00000
16 mm	3/8"	0.52"	16.88	0.46	5,000	Not Rated	Aluminum	Flange	4239N42	00000
16 mm	1/2"	0.52"	16.88	0.46	5,000	Not Rated	Aluminum	Flange	4239N43	00000
20 mm	3/8"	0.79"	20.87	0.45	5,000	Not Rated	Aluminum	Flange	4239N44	00000

Light Duty Sleeve Bushings

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

	OD	Overall Wd.	Set Screw Hole Dia.		Each
Steel



	1/4"	1/2"	1 1/8"	3/8"	6420K12	00000


	5/16"	1/2"	1 1/8"	3/8"	6420K13	0000
	3/8"	1/2"	1 1/8"	3/8"	6420K14	0000
	7/16"	1/2"	1 1/8"	3/8"	6420K15	00000
	1/2"	5/8"	1 1/8"	3/8"	6420K17	0000
	1/2"	3/4"	1 1/4"	7/16"	6420K18	0000
	5/8"	3/4"	1 1/4"	3/8"	6420K19	0000
	5/8"	1"	1 1/4"	7/16"	6420K23	00000
	3/4"	1"	1 1/4"	7/16"	6420K24	00000
	7/8"	1"	1 1/4"	7/16"	6420K25	00000

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.

	OD	Overall Wd.	Material		Each
For 1/2" Diameter Shafts



		3/4"	1/2"	Steel	58365K85	000000


		3/4"	3/4"	Steel	58365K31	00000
		3/4"	1"	Steel	58365K32	00000


		For 3/4" Diameter Shafts



				1"	1/2"	Steel	58365K33	0000


				1"	5/8"	Steel	58365K101	0000
				1"	3/4"	Steel	58365K11	0000
				1"	1"	Steel	58365K12	0000
				1"	1 1/4"	Steel	58365K34	0000
				1"	1 1/2"	Steel	58365K13	0000
				1"	2"	Steel	58365K35	00000


				For 1" Diameter Shafts



						1 1/4"	1/2"	Steel	58365K36	0000


						1 1/4"	5/8"	Steel	58365K37	0000
						1 1/4"	3/4"	Steel	58365K38	0000
						1 1/4"	7/8"	Steel	58365K39	0000
						1 1/4"	1"	Steel	58365K14	0000
						1 1/4"	1 1/4"	Steel	58365K41	0000
						1 1/4"	1 1/2"	Steel	58365K15	0000
						1 1/4"	2"	Steel	58365K16	00000
						1 1/4"	2 1/2"	Steel	58365K102	00000
						1 1/4"	3"	Steel	58365K103	00000
						1 3/8"	3/4"	Steel	58365K104	00000


						1 3/8"	1"	Steel	58365K106	00000
						1 3/8"	1 1/4"	Steel	58365K105	00000
						1 1/2"	1"	Steel	58365K107	00000
						1 1/2"	1 1/2"	Steel	58365K108	00000


						For 1 1/8" Diameter Shafts



								1 3/8"	1"	Steel	58365K43	00000


								1 3/8"	1 1/2"	Steel	58365K44	00000


								For 1 1/4" Diameter Shafts



1 1/2"										1/2"	Steel	58365K45	0000


1 1/2"	3/4"									Steel	58365K46	0000
1 1/2"	1"									Steel	58365K17	0000
1 1/2"	1 1/4"									Steel	58365K47	0000
1 1/2"	1 1/2"									Steel	58365K18	00000
1 1/2"	2"									Steel	58365K19	00000
1 1/2"	2 1/2"									Steel	58365K48	00000
1 1/2"	3"									Steel	58365K49	00000
1 5/8"	1"									Steel	58365K109	00000
1 5/8"	1 1/4"	Steel								58365K111	00000
1 5/8"	1 1/2"	Steel	58365K112							00000


1 5/8"	2"	Steel	58365K113							00000


For 1 3/8" Diameter Shafts



		1 5/8"	1 1/2"							Steel	58365K114	00000


		1 3/4"	1 1/4"							Steel	58365K51	00000
		1 3/4"	1 1/2"							Steel	58365K52	00000
		1 3/4"	2"	Steel						58365K53	00000


		For 1 1/2" Diameter Shafts



				1 3/4"	1/2"					Steel	58365K54	0000


				1 3/4"	3/4"					Steel	58365K55	0000
				1 3/4"	1"					Steel	58365K56	00000
				1 3/4"	1 1/4"					Steel	58365K57	00000
				1 3/4"	1 1/2"					Steel	58365K21	00000
				1 3/4"	2"					Steel	58365K58	00000
				1 3/4"	2 1/2"					Steel	58365K59	00000
				1 3/4"	2 3/4"					Steel	58365K61	00000
				1 7/8"	3/4"					Steel	58365K115	00000
				1 7/8"	1"					Steel	58365K116	00000
				1 7/8"	1 1/4"					Steel	58365K117	00000


				1 7/8"	1 1/2"					Steel	58365K118	00000
				1 7/8"	2"					Steel	58365K119	00000
				2"	1"					Steel	58365K121	00000
				2"	1 1/4"					Steel	58365K122	00000
				2"	1 1/2"	Steel				58365K123	00000
				2"	2"	Steel	58365K124			00000
				2"	3"	Steel	58365K125			00000


				For 1 3/4" Diameter Shafts



						2"	1"			Steel	58365K62	00000


						2"	1 1/4"	Steel	58365K63	00000
						2"	1 1/2"	Steel	58365K64	00000
						2"	2"	Steel	58365K126	00000


						For 2" Diameter Shafts



								2 1/4"	1"	Steel	58365K132	00000


								2 1/4"	1 1/2"	Steel	58365K65	00000
								2 1/4"	2"	Steel	58365K66	00000
								2 1/4"	2 1/2"	Steel	58365K28	00000
								2 1/4"	3"	Steel	58365K133	00000
								2 3/8"	3/4"	Steel	58365K127	00000
								2 3/8"	1"	Steel	58365K128	00000
2 3/8"								1 1/4"	Steel	58365K129	00000
2 3/8"	1 1/2"							Steel	58365K131	00000
2 3/8"	2"							Steel	58365K134	00000
2 3/8"	3"							Steel	58365K135	00000


2 1/2"	1"							Steel	58365K67	00000
2 1/2"	1 1/2"							Steel	58365K68	00000
2 1/2"	2"							Steel	58365K69	00000
2 1/2"	2 1/2"							Steel	58365K71	00000
2 1/2"	3"							Steel	58365K72	00000


For 2 1/2" Diameter Shafts



		3"	1 1/2"					Steel	58365K74	00000


		3"	2"					Steel	58365K75	00000
		3"	3"					Steel	58365K77	00000


		For 3" Diameter Shafts



								3 1/2"	1 1/2"	Steel	58365K79	00000


								3 1/2"	2"	Steel	58365K81	00000
								3 1/2"	2 1/2"	Steel	58365K82	00000
								3 1/2"	3"	Steel	58365K83	00000

Bearing Adapter Sleeves

Make up for imperfections and gaps between your bearing and shaft for a tight fit. These bearing adapter sleeves are the most common way to mount a bearing with a tapered bore onto a cylindrical seat. They work with both straight and stepped shafts. Secure using the included lock nut.

Inch

	For Shaft Dia.	ID	Wd.	Includes		Each
Low-Carbon Steel



	SNW-06	15/16"	15/16"	1.343"	Lock Nut, Lock Washer	4449N27	000000


	SNW-07	1 1/8"	1 1/8"	1.469"	Lock Nut, Lock Washer	4449N11	00000
	SNW-07	1 3/16"	1 3/16"	1.449"	Lock Nut, Lock Washer	4449N28	00000
	SNW-08	1 1/4"	1 1/4"	1.514"	Lock Nut, Lock Washer	4449N12	00000
	SNW-08	1 3/8"	1 3/8"	1.514"	Lock Nut, Lock Washer	4449N13	00000
	SNW-09	1 5/16"	1 5/16"	1.574"	Lock Nut, Lock Washer	4449N29	00000
	SNW-09	1 3/8"	1 3/8"	1.594"	Lock Nut, Lock Washer	4449N14	00000
	SNW-09	1 7/16"	1 7/16"	1.574"	Lock Nut, Lock Washer	4449N31	00000
	SNW-09	1 1/2"	1 1/2"	2.123"	Lock Nut, Lock Washer	4449N32	00000
	SNW-10	1 5/8"	1 5/8"	1.775"	Lock Nut, Lock Washer	4449N15	00000
	SNW-10	1 11/16"	1 11/16"	1.755"	Lock Nut, Lock Washer	4449N33	00000


	SNW-11	1 3/4"	1 3/4"	1.855"	Lock Nut, Lock Washer	4449N16	00000
	SNW-11	1 15/16"	1 15/16"	1.855"	Lock Nut, Lock Washer	4449N17	00000
	SNW-13	2 3/16"	2 3/16"	2.09"	Lock Nut, Lock Washer	4449N34	00000

Metric

	For Shaft Dia., mm	ID, mm	Wd., mm	Includes		Each
Low-Carbon Steel



	H 206	25	25	27	Lock Nut, Lock Washer	4449N18	000000


	H 207	30	30	29	Lock Nut, Lock Washer	4449N19	00000
	H 208	35	35	31	Lock Nut, Lock Washer	4449N21	00000
	H 305	20	20	29	Lock Nut, Lock Washer	4449N22	00000
	H 308	35	35	36	Lock Nut, Lock Washer	4449N23	00000
	H 309	40	40	39	Lock Nut, Lock Washer	4449N24	00000
	H 311	50	50	45	Lock Nut, Lock Washer	4449N25	00000
	H 2306	25	25	38	Lock Nut, Lock Washer	7835T147	00000
	H 2307	30	30	43	Lock Nut, Lock Washer	7835T149	00000
	H 2308	35	35	46	Lock Nut, Lock Washer	7835T152	00000
	H 2309	40	40	50	Lock Nut, Lock Washer	7835T154	00000


	H 2310	45	45	55	Lock Nut, Lock Washer	7835T156	00000
	H 2311	50	50	59	Lock Nut, Lock Washer	4449N26	00000
	H 2312	55	55	62	Lock Nut, Lock Washer	7835T161	000000
	H 2313	60	60	65	Lock Nut, Lock Washer	7835T164	00000

Quick-Grip Flanged Hydraulic Bushings

Tighten just one set screw to clamp these bushings evenly around your shaft. The screw forces hydraulic fluid in between the double-walled sleeve, expanding the two walls against the shaft and the hub of your sprocket, pulley, or gear for a tight hold. Since you don’t have to tighten multiple screw clamps individually, these bushings are quick to adjust and more likely to stay aligned on your shaft. They’re also good for shock loads. A mounting flange prevents movement during tightening. Use a hex key to tighten.

Note: To avoid deforming the sleeve walls, make sure to fully tighten the screw.

17-4 PH Stainless Steel—17-4 PH stainless steel bushings have excellent corrosion resistance in most environments.

				Set Screw
	For Shaft Dia.	OD	Overall Wd.	Hole Dia.	Thread Size	Max. Torque, in·lbf	Fastener Tightening Torque, in·lbf		Each
Steel



		5/8"	1 7/8"	1 9/16"	3/8"	M10	460	40	7636N11	0000000


		3/4"	2"	1 5/8"	3/8"	M10	750	40	7636N12	000000
		7/8"	2 3/16"	1 13/16"	3/8"	M10	1,150	40	7636N13	000000
		1"	2 5/16"	1 15/16"	3/8"	M10	1,650	40	7636N14	000000
		1 1/8"	2 1/2"	2 1/16"	3/8"	M10	2,550	40	7636N15	000000
		1 1/4"	2 11/16"	2 3/16"	3/8"	M10	3,800	40	7636N16	000000
		1 1/2"	3 5/16"	2 13/16"	5/8"	M16	7,850	180	7636N17	000000
		20 mm	51 mm	44 mm	3/8"	M10	970	40	7636N18	000000
		30 mm	64 mm	54 mm	3/8"	M10	3,350	40	7636N19	000000
		40 mm	86 mm	75 mm	5/8"	M16	9,700	180	7636N21	000000
		50 mm	98 mm	80 mm	5/8"	M16	16,800	180	7636N22	000000


		17-4 PH Stainless Steel



				3/4"	2"	1 5/8"	3/8"	M10	750	40	7636N23	000000


				7/8"	2 3/16"	1 13/16"	3/8"	M10	1,150	40	7636N24	000000
				1"	2 5/16"	1 15/16"	3/8"	M10	1,650	40	7636N25	000000
				1 1/4"	2 11/16"	2 3/16"	3/8"	M10	3,800	40	7636N26	000000
				1 1/2"	3 5/16"	2 13/16"	5/8"	M16	7,850	180	7636N27	00000000
				20 mm	51 mm	44 mm	3/8"	M10	970	40	7636N28	000000
				30 mm	64 mm	54 mm	3/8"	M10	3,350	40	7636N29	000000
				40 mm	86 mm	75 mm	5/8"	M16	9,700	180	7636N31	00000000
				50 mm	98 mm	80 mm	5/8"	M16	16,800	180	7636N32	00000000

Bench and Pedestal Grinding Wheel Reducer Bushings


Bushing Shown with Wheel (Not Included)

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 Dia.	For Shank Dia.	For Wheel Thk.	Material		Each
1"	1/2", 5/8", 3/4"	1/2"	Polystyrene	4461A441	00000
1"	1/2", 5/8", 3/4"	3/4"	Polystyrene	4461A442	0000
1 1/4"	5/8", 3/4", 1"	1"	Polystyrene	4461A443	0000

Circular Saw Blade 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.

Arbor Hole Size	Arbor Hole Shape	Thk.	Material		Each
5/8" to 1/2"	Round	0.056"	Steel	68885A64	00000
3/4" to 5/8"	Round	0.061"	Steel	68885A63	0000
20 mm to 5/8"	Round	0.041"	Steel	68885A65	0000
1" to 20 mm	Round	0.07"	Steel	4109A58	0000
1" to 3/4"	Round	0.089"	Steel	68885A62	00000
1" to 5/8"	Round	0.061"	Steel	68885A61	0000
1" to 7/8"	Round	0.07"	Steel	4109A57	0000

Arbor-Mount Sanding Flap Wheel Arbor Hole Reducers

Reduce the arbor hole size on a sanding flap 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 Arbor Hole Dia.	Choose a Reduced Arbor Hole Diameter		Pair
1"	3/8", 1/2", 5/8", 3/4", 7/8"	4654A111	00000
1 3/4"	3/4", 1", 1 1/4"	4654A112	00000

Wheel Brush Arbor Hole Reducers

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

Steel

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

For Arbor Hole Dia.	Reduced Arbor Hole Dia.	For Max. Wheel Brush Thk.		Pair
2"	1/2"	2"	4844A28	00000
2"	5/8"	2"	4844A29	0000
2"	3/4"	2"	4844A31	0000
2"	7/8"	2"	4844A32	0000
2"	1"	2"	4844A33	0000
2"	1 1/4"	2"	4844A34	0000
2"	1 1/2"	2"	4844A35	0000

Plastic

For Arbor Hole Dia.	Reduced Arbor Hole Dia.	Pkg. Qty.		Pkg.
1/2"	3/8"	12	4873A22	00000
5/8"	1/2"	12	4873A23	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.

Arbor Hole Size	Thk.	Material		Each
Diamond to 5/8" Round	0.045"	Steel	4109A59	00000