R8 Milling Machine Collets

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Collet Sizes Included

1/16"-7/8" (increments of 1/32")

1/8"-1" (increments of 1/8")

1/8"-3/4" (increments of 1/32", excludes 17/32")

1/8"-7/8" (increments of 1/16")

3 mm-20 mm (increments of 1 mm)

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84 Products

R8 Collets

Grip cutting tools in the R8 taper spindle of your Bridgeport or other milling machine. These collets thread onto your machine’s drawbar, pulling them into the spindle so they can clamp tightly around your bit.

The lower the runout, the higher the accuracy and the longer the tool life.

0.0008" Total Indicated Runout (TIR) Accuracy—An accuracy of 0.0008” works well for roughing and heavy material removal, where tight tolerances aren't critical.

	Collet Size	ID Tolerance	Body Dia.	Overall Lg.	Internal Thread Size		Each
Hardened Steel—0.0002" Total Indicated Runout (TIR) Accuracy



		1/16"	-0.004" to 0"	0.95"	4.089"	7/16"-20	3257A61	000000


		3/32"	-0.004" to 0"	0.95"	4.089"	7/16"-20	3257A62	00000
		1/8"	-0.004" to 0"	0.95"	4.089"	7/16"-20	3257A11	00000
		5/32"	-0.004" to 0"	0.95"	4.089"	7/16"-20	3257A12	00000
		3/16"	-0.004" to 0"	0.95"	4.089"	7/16"-20	3257A13	00000
		7/32"	-0.004" to 0"	0.95"	4.089"	7/16"-20	3257A14	00000
		1/4"	-0.004" to 0"	0.95"	4.089"	7/16"-20	3257A15	00000
		9/32"	-0.004" to 0"	0.95"	4.089"	7/16"-20	3257A16	00000
		5/16"	-0.004" to 0"	0.95"	4.089"	7/16"-20	3257A17	00000
		11/32"	-0.004" to 0"	0.95"	4.089"	7/16"-20	3257A18	00000
		3/8"	-0.004" to 0"	0.95"	4.089"	7/16"-20	3257A19	00000


		13/32"	-0.004" to 0"	0.95"	4.089"	7/16"-20	3257A21	00000
		7/16"	-0.004" to 0"	0.95"	4.089"	7/16"-20	3257A22	00000
		15/32"	-0.004" to 0"	0.95"	4.089"	7/16"-20	3257A23	00000
		1/2"	-0.004" to 0"	0.95"	4.089"	7/16"-20	3257A24	00000
		17/32"	-0.004" to 0"	0.95"	4.089"	7/16"-20	3257A25	00000
		9/16"	-0.004" to 0"	0.95"	4.089"	7/16"-20	3257A26	00000
		19/32"	-0.004" to 0"	0.95"	4.089"	7/16"-20	3257A63	00000
		5/8"	-0.004" to 0"	0.95"	4.089"	7/16"-20	3257A28	00000
		21/32"	-0.004" to 0"	0.95"	4.089"	7/16"-20	3257A29	00000
		11/16"	-0.004" to 0"	0.95"	4.089"	7/16"-20	3257A31	00000


		23/32"	-0.004" to 0"	0.95"	4.089"	7/16"-20	3257A32	00000
		3/4"	-0.004" to 0"	0.95"	4.089"	7/16"-20	3257A33	00000
		25/32"	-0.004" to 0"	0.95"	4.089"	7/16"-20	3257A34	00000
		13/16"	-0.004" to 0"	0.95"	4.089"	7/16"-20	3257A35	00000
		27/32"	-0.004" to 0"	0.95"	4.089"	7/16"-20	3257A36	00000
		7/8"	-0.004" to 0"	0.95"	4.089"	7/16"-20	3257A37	00000
		1"	-0.004" to 0"	0.95"	5.1"	7/16"-20	3257A64	00000
		3 mm	-0.004" to 0"	0.95"	4.089"	7/16"-20	3257A41	00000
		4 mm	-0.004" to 0"	0.95"	4.089"	7/16"-20	3257A42	00000
		5 mm	-0.004" to 0"	0.95"	4.089"	7/16"-20	3257A43	00000


		6 mm	-0.004" to 0"	0.95"	4.089"	7/16"-20	3257A44	00000
		7 mm	-0.004" to 0"	0.95"	4.089"	7/16"-20	3257A45	00000
		8 mm	-0.004" to 0"	0.95"	4.089"	7/16"-20	3257A46	00000
		9 mm	-0.004" to 0"	0.95"	4.089"	7/16"-20	3257A47	00000
		10 mm	-0.004" to 0"	0.95"	4.089"	7/16"-20	3257A48	00000
		11 mm	-0.004" to 0"	0.95"	4.089"	7/16"-20	3257A49	00000
		12 mm	-0.004" to 0"	0.95"	4.089"	7/16"-20	3257A51	00000
		13 mm	-0.004" to 0"	0.95"	4.089"	7/16"-20	3257A52	00000
		14 mm	-0.004" to 0"	0.95"	4.089"	7/16"-20	3257A53	00000
		15 mm	-0.004" to 0"	0.95"	4.089"	7/16"-20	3257A54	00000


		16 mm	-0.004" to 0"	0.95"	4.089"	7/16"-20	3257A55	00000
		17 mm	-0.004" to 0"	0.95"	4.089"	7/16"-20	3257A56	00000
		18 mm	-0.004" to 0"	0.95"	4.089"	7/16"-20	3257A57	00000
		19 mm	-0.004" to 0"	0.95"	4.089"	7/16"-20	3257A58	00000
		20 mm	-0.004" to 0"	0.95"	4.089"	7/16"-20	3257A59	00000


		Hardened Steel—0.0008" Total Indicated Runout (TIR) Accuracy



3/32"	-0.004" to 0"			0.95"	4.134"	7/16"-20	3257A335	00000


1/8"	0" to 0.001"			0.95"	4.134"	7/16"-20	3257A303	00000
5/32"	0" to 0.001"			0.95"	4.134"	7/16"-20	3257A304	00000
3/16"	0" to 0.001"			0.95"	4.134"	7/16"-20	3257A305	00000
7/32"	0" to 0.001"			0.95"	4.134"	7/16"-20	3257A306	00000
1/4"	0" to 0.001"			0.95"	4.134"	7/16"-20	3257A307	00000
9/32"	0" to 0.001"			0.95"	4.134"	7/16"-20	3257A308	00000
5/16"	0" to 0.001"			0.95"	4.134"	7/16"-20	3257A309	00000
11/32"	0" to 0.001"			0.95"	4.134"	7/16"-20	3257A311	00000
3/8"	0" to 0.001"			0.95"	4.134"	7/16"-20	3257A312	00000
13/32"	0" to 0.001"			0.95"	4.134"	7/16"-20	3257A313	00000


7/16"	0" to 0.001"			0.95"	4.134"	7/16"-20	3257A314	00000
15/32"	0" to 0.001"			0.95"	4.134"	7/16"-20	3257A315	00000
1/2"	0" to 0.001"			0.95"	4.134"	7/16"-20	3257A316	00000
9/16"	0" to 0.001"			0.95"	4.134"	7/16"-20	3257A317	00000
5/8"	0" to 0.001"			0.95"	4.134"	7/16"-20	3257A318	00000
3/4"	0" to 0.001"			0.95"	4.134"	7/16"-20	3257A319	00000
7/8"	-0.004" to 0"			0.95"	4.134"	7/16"-20	3257A336	00000
2 mm	-0.004" to 0"			0.95"	4.134"	7/16"-20	3257A337	00000
3 mm	0" to 0.001"			0.95"	4.134"	7/16"-20	3257A321	00000
4 mm	0" to 0.001"			0.95"	4.134"	7/16"-20	3257A322	00000


5 mm	0" to 0.001"			0.95"	4.134"	7/16"-20	3257A323	00000
6 mm	0" to 0.001"			0.95"	4.134"	7/16"-20	3257A324	00000
7 mm	0" to 0.001"			0.95"	4.134"	7/16"-20	3257A325	00000
8 mm	0" to 0.001"			0.95"	4.134"	7/16"-20	3257A326	00000
9 mm	0" to 0.001"			0.95"	4.134"	7/16"-20	3257A327	00000
10 mm	0" to 0.001"			0.95"	4.134"	7/16"-20	3257A328	00000
12 mm	0" to 0.001"			0.95"	4.134"	7/16"-20	3257A329	00000
14 mm	0" to 0.001"			0.95"	4.134"	7/16"-20	3257A331	00000
16 mm	0" to 0.001"			0.95"	4.134"	7/16"-20	3257A332	00000
18 mm	0" to 0.001"			0.95"	4.134"	7/16"-20	3257A333	00000


20 mm	0" to 0.001"			0.95"	4.134"	7/16"-20	3257A334	00000

Machine-Your-Own R8 Collets

Create custom collets in the exact size and shape you need. The face on these collets can be machined to match workpieces and bits with hex and square shanks or sized to ¹⁄₆₄" increments. Also known as emergency collets.

These collets thread onto your machine’s drawbar for a secure connection. Use the included spreader pins to hold the face open while machining the cavity.

Max. Bore Dia.	Body Dia.	Overall Lg.	Face Pilot Hole Dia.	Internal Thread Size	Material		Each
3/4"	0.95"	4.089"	1/16"	7/16"-20	Steel	9634N11	000000

R8 Collet Sets

Keep a set of R8 collets on hand to hold cutting tools in the spindle of your Bridgeport or other milling machine. These collets thread onto your machine’s drawbar, pulling them into the spindle so they can clamp tightly around your bit.

The lower the runout, the higher the accuracy and the longer the tool life.

0.0008" Total Indicated Runout (TIR) Accuracy—An accuracy of 0.0008" works well for roughing and heavy material removal, where tight tolerances aren't critical.

	Collet Sizes Included	ID Tolerance	Body Dia.	Overall Lg.	Internal Thread Size	Container Type		Each
Hardened Steel—0.0002" Total Indicated Runout (TIR) Accuracy



	8	1/8"-1" (increments of 1/8")	-0.004" to 0"	0.95"	4.089"	7/16"-20	—	3257A65	0000000


	13	1/8"-7/8" (increments of 1/16")	-0.004" to 0"	0.95"	4.089"	7/16"-20	—	3257A66	000000
	18	3 mm-20 mm (increments of 1 mm)	-0.004" to 0"	0.95"	4.089"	7/16"-20	—	3257A69	000000
	27	1/16"-7/8" (increments of 1/32")	-0.004" to 0"	0.95"	4.089"	7/16"-20	—	3257A68	000000


	Hardened Steel—0.0008" Total Indicated Runout (TIR) Accuracy



			20	1/8"-3/4" (increments of 1/32", excludes 17/32")	0" to 0.001"	0.95"	4.089"	7/16"-20	Plastic Case	3257A71	000000