Wrenching Collars | McMaster-Carr

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About Shaft Collars

Shaft collars are useful for holding and positioning components on a shaft. They can also serve as mechanical stops and stroke limiters.

Use a wrench to rotate your drive shaft without marring or gouging the shaft. Fasten one of these collars onto your shaft, position a wrench on the collar’s wrench flats, and then rotate the entire shaft/collar assembly to adjust the shaft. The two-piece design allows you to install these collars anywhere on a shaft without removing components or having access to the ends of the shaft. Tighten the clamping screws to secure.

Black-oxide steel collars have some corrosion resistance. Aluminum collars are lightweight and strong. 303 stainless steel collars have excellent corrosion resistance.

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

Inch

				Clamping Screw
For Shaft Dia.	OD	Wd.	Flat-to-Flat Ht.	Type	No. Included		Each
Black-Oxide 1215 Carbon Steel
1/4"	11/16"	5/16"	9/16"	Socket Head Screw	2	0000000	000000
3/8"	7/8"	3/8"	3/4"	Socket Head Screw	2	0000000	00000
1/2"	1 1/8"	13/32"	15/16"	Socket Head Screw	2	000000	00000
5/8"	1 5/16"	7/16"	1 1/8"	Socket Head Screw	2	000000	00000
3/4"	1 1/2"	1/2"	1 5/16"	Socket Head Screw	2	000000	00000
1"	1 3/4"	1/2"	1 9/16"	Socket Head Screw	2	000000	00000
1 1/8"	1 7/8"	1/2"	1 11/16"	Socket Head Screw	2	000000	00000
1 1/4"	2 1/16"	1/2"	1 7/8"	Socket Head Screw	2	000000	00000
1 3/8"	2 1/4"	9/16"	2 1/16"	Socket Head Screw	2	000000	00000
1 1/2"	2 3/8"	9/16"	2 3/16"	Socket Head Screw	2	000000	00000
1 3/4"	2 3/4"	11/16"	2 9/16"	Socket Head Screw	2	0000000	00000
2"	3"	11/16"	2 13/16"	Socket Head Screw	2	0000000	00000
2 1/4"	3 1/4"	3/4"	3 1/16"	Socket Head Screw	2	0000000	00000
2 1/2"	3 3/4"	7/8"	3 9/16"	Socket Head Screw	2	0000000	000000
3"	4 1/4"	7/8"	4 1/16"	Socket Head Screw	2	0000000	000000
2024 Aluminum
1/4"	11/16"	5/16"	9/16"	Socket Head Screw	2	0000000	00000
3/8"	7/8"	3/8"	3/4"	Socket Head Screw	2	0000000	00000
1/2"	1 1/8"	13/32"	15/16"	Socket Head Screw	2	0000000	00000
5/8"	1 5/16"	7/16"	1 1/8"	Socket Head Screw	2	0000000	00000
3/4"	1 1/2"	1/2"	1 5/16"	Socket Head Screw	2	0000000	00000
1"	1 3/4"	1/2"	1 9/16"	Socket Head Screw	2	0000000	00000
1 1/8"	1 7/8"	1/2"	1 11/16"	Socket Head Screw	2	0000000	00000
1 1/4"	2 1/16"	1/2"	1 7/8"	Socket Head Screw	2	0000000	00000
1 3/8"	2 1/4"	9/16"	2 1/16"	Socket Head Screw	2	0000000	00000
1 1/2"	2 3/8"	9/16"	2 3/16"	Socket Head Screw	2	0000000	00000
1 3/4"	2 3/4"	11/16"	2 9/16"	Socket Head Screw	2	0000000	00000
2"	3"	11/16"	2 13/16"	Socket Head Screw	2	0000000	00000
2 1/4"	3 1/4"	3/4"	3 1/16"	Socket Head Screw	2	0000000	00000
2 1/2"	3 3/4"	7/8"	3 9/16"	Socket Head Screw	2	0000000	000000
3"	4 1/4"	7/8"	4 1/16"	Socket Head Screw	2	0000000	000000
303 Stainless Steel
1/4"	11/16"	5/16"	9/16"	Socket Head Screw	2	0000000	00000
3/8"	7/8"	3/8"	3/4"	Socket Head Screw	2	0000000	00000
1/2"	1 1/8"	13/32"	15/16"	Socket Head Screw	2	0000000	00000
5/8"	1 5/16"	7/16"	1 1/8"	Socket Head Screw	2	0000000	00000
3/4"	1 1/2"	1/2"	1 5/16"	Socket Head Screw	2	0000000	00000
1"	1 3/4"	1/2"	1 9/16"	Socket Head Screw	2	0000000	00000
1 1/8"	1 7/8"	1/2"	1 11/16"	Socket Head Screw	2	0000000	00000
1 1/4"	2 1/16"	1/2"	1 7/8"	Socket Head Screw	2	0000000	00000
1 3/8"	2 1/4"	9/16"	2 1/16"	Socket Head Screw	2	0000000	00000
1 1/2"	2 3/8"	9/16"	2 3/16"	Socket Head Screw	2	0000000	00000
1 3/4"	2 3/4"	11/16"	2 9/16"	Socket Head Screw	2	0000000	00000
2"	3"	11/16"	2 13/16"	Socket Head Screw	2	0000000	000000
2 1/4"	3 1/4"	3/4"	3 1/16"	Socket Head Screw	2	0000000	000000
2 1/2"	3 3/4"	7/8"	3 9/16"	Socket Head Screw	2	0000000	000000
3"	4 1/4"	7/8"	4 1/16"	Socket Head Screw	2	0000000	000000

Metric

				Clamping Screw		Black-Oxide 1215 Carbon Steel		303 Stainless Steel
For Shaft Dia., mm	OD, mm	Wd., mm	Flat-to-Flat Ht., mm	Type	No. Included		Each		Each
10	24	9	19	Socket Head Screw	2	00000000	000000	00000000	000000
12	28	11	23	Socket Head Screw	2	00000000	00000	00000000	00000
14	30	11	25	Socket Head Screw	2	00000000	00000	00000000	00000
15	34	13	29	Socket Head Screw	2	00000000	00000	00000000	00000
16	34	13	29	Socket Head Screw	2	00000000	00000	00000000	00000
18	36	13	31	Socket Head Screw	2	00000000	00000	000000	00
20	40	15	35	Socket Head Screw	2	00000000	00000	00000000	00000
25	45	15	40	Socket Head Screw	2	00000000	00000	000000	00
30	54	15	49	Socket Head Screw	2	00000000	00000	00000000	000000
35	57	15	52	Socket Head Screw	2	00000000	00000	000000	00
40	60	15	55	Socket Head Screw	2	00000000	00000	00000000	000000
45	73	19	68	Socket Head Screw	2	00000000	00000	000000	00
50	78	19	73	Socket Head Screw	2	00000000	000000	000000	00
55	82	19	77	Socket Head Screw	2	00000000	000000	000000	00
60	88	19	83	Socket Head Screw	2	00000000	000000	00000000	000000

Steel Clamping Two-Piece Pipe Collars with Wrench Flats

To avoid gouging and marring your pipe while making adjustments, these collars have flats where you can grab and rotate the pipe with a wrench. They're sized precisely for a tight fit around pipe, so they're often used to support pipe passing through floors and walls. They can also easily be machined to hang signs. Since they’re two pieces, you don’t need to have access to the ends of your pipe to install them. Tighten the clamping screws to secure. They’re black-oxide steel, so they have some corrosion resistance.

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

					Clamping Screw
For Pipe Size	ID	OD	Width	Flat-to-Flat Height	Type	Thread Size	Hex Key Size	No. Included		Each
Black-Oxide 1215 Carbon Steel
3/8	0.69"	1 1/2"	1/2"	1.312"	Socket Head Screw	1/4"-28	3/16"	2	0000000	000000
1/2	0.857"	1 3/4"	1/2"	1.562"	Socket Head Screw	1/4"-28	3/16"	2	0000000	00000
3/4	1.065"	2"	1/2"	1.812"	Socket Head Screw	1/4"-28	3/16"	2	0000000	00000
1	1.33"	2 1/4"	1/2"	2.062"	Socket Head Screw	1/4"-28	3/16"	2	0000000	00000
1 1/4	1.675"	2 1/2"	1/2"	2.312"	Socket Head Screw	1/4"-28	3/16"	2	0000000	00000
1 1/2	1.915"	3 1/4"	5/8"	2.812"	Socket Head Screw	5/16"-24	1/4"	2	0000000	00000

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About Shaft Collars

Clamping Two-Piece Shaft Collars with Wrench Flats

Steel Clamping Two-Piece Pipe Collars with Wrench Flats