Locating Keys | McMaster-Carr

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72 Products

Fixture Keys

Rectangle

Stepped Rectangle

Sized to fit with precision in machine table T-slots, use these keys to locate fixtures and vises on your machine table. They mount to the underside of your fixture or vise with a socket head cap screw.

	Ht.	Wd. Tolerance	For Mounting Screw Size	Mounting Fasteners Included		Each
Rectangle







	Steel

	5/16"	3/4"	5/16"	1/2"	-0.0005" to 0"	No. 4	No	8961A11	00000


	3/8"	3/4"	3/8"	1/2"	-0.0005" to 0"	No. 6	No	8961A12	0000
	7/16"	3/4"	7/16"	1/2"	-0.0005" to 0"	No. 6	No	8961A13	0000
	1/2"	3/4"	1/2"	1/2"	-0.0005" to 0"	1/4"	No	8961A65	0000
	9/16"	3/4"	9/16"	1/2"	-0.0005" to 0"	1/4"	No	8961A66	0000
	5/8"	3/4"	5/8"	1/2"	-0.0005" to 0"	5/16"	No	8961A67	0000
	11/16"	1"	11/16"	1/2"	-0.0005" to 0"	5/16"	No	8961A68	00000
	3/4"	1 1/4"	3/4"	1/2"	-0.0005" to 0"	5/16"	No	8961A69	00000
	13/16"	1 1/4"	13/16"	1/2"	-0.0005" to 0"	5/16"	No	8961A7	00000
	7/8"	1 1/4"	7/8"	3/4"	-0.0005" to 0"	5/16"	No	8961A14	00000
	1"	1 1/4"	1"	3/4"	-0.0005" to 0"	5/16"	No	8961A15	00000


	1 1/8"	1 1/2"	1 1/8"	3/4"	-0.0005" to 0"	3/8"	No	8961A16	00000
	1 1/4"	1 1/2"	1 1/4"	1"	-0.0005" to 0"	3/8"	No	8961A17	00000
	1 5/16"	1 1/2"	1 5/16"	1"	-0.0005" to 0"	3/8"	No	8961A18	00000
	1 3/8"	1 1/2"	1 3/8"	1"	-0.0005" to 0"	3/8"	No	8961A19	00000
	10 mm	20 mm	10 mm	8 mm	-0.009 mm to 0 mm	M4	No	8961A71	00000
	12 mm	20 mm	12 mm	8 mm	-0.011 mm to 0 mm	M5	No	8961A72	00000
	14 mm	22 mm	14 mm	10 mm	-0.011 mm to 0 mm	M6	No	8961A73	00000
	16 mm	22 mm	16 mm	10 mm	-0.011 mm to 0 mm	M6	No	8961A74	00000
	18 mm	22 mm	18 mm	10 mm	-0.011 mm to 0 mm	M6	No	8961A75	00000
	20 mm	22 mm	20 mm	10 mm	-0.013 mm to 0 mm	M6	No	8961A76	00000


	22 mm	32 mm	22 mm	12 mm	-0.013 mm to 0 mm	M6	No	8961A77	00000
	24 mm	32 mm	24 mm	12 mm	-0.013 mm to 0 mm	M6	No	8961A78	00000


	Stepped Rectangle







					Steel

					28 mm	32 mm	20 mm	12 mm	-0.013 mm to 0 mm	M6	No	8961A79	00000


					36 mm	32 mm	20 mm	12 mm	-0.013 mm to 0 mm	M6	No	8961A81	00000

Hole-Mount Fixture Keys

Install these keys in a drilled and reamed hole to locate fixtures and vises on your machine table. They mount to the underside of the fixture or vise. Each key can fit multiple machine table T-slot widths. Also known as sine keys.

Style 1—Expanding

Expanding keys have a screw that tightens from the top or bottom to adjust the shank size, giving the key a tight fit in a hole in your fixture.

For Machine Table T-Slot Wd.					Shank
(A)	(B)	For Hole Size	For Hole Size Tolerance	Ht.	Dia.	Ht.		Each







			Steel

			1/2"	7/8"	5/8"	-0.0005" to 0.0005"	7/16"	5/8"	3/4"	3082N11	000000


			9/16"	3/4"	5/8"	-0.0005" to 0.0005"	7/16"	5/8"	3/4"	3082N12	00000
			1"	1 1/16"	3/4"	-0.0005" to 0.0005"	7/16"	3/4"	3/4"	3082N14	00000
			10 mm	20 mm	5/8"	-0.0005" to 0.0005"	7/16"	5/8"	3/4"	3082N15	00000
			12 mm	22 mm	5/8"	-0.0005" to 0.0005"	7/16"	5/8"	3/4"	3082N16	00000

Style 2—Expanding

Expanding keys have a screw that tightens from the top or bottom to adjust the shank size, giving the key a tight fit in a hole in your fixture.

For Machine Table T-Slot Wd.						Shank
(A)	(B)	(C)	For Hole Size	For Hole Size Tolerance	Ht.	Dia.	Ht.		Each







			Steel

			5/8"	11/16"	13/16"	5/8"	-0.0005" to 0.0005"	7/16"	5/8"	3/4"	3082N13	000000


			14 mm	16 mm	18 mm	5/8"	-0.0005" to 0.0005"	7/16"	5/8"	3/4"	3082N17	00000

Style 3—Push In

Push-in keys are the only fixture keys compatible with DX-series Kurt vises. Insert them into the holes on the bottom of the vise and built-in O-rings hold the keys in place. They are sold in pairs.

For Machine Table T-Slot Wd.					Shank
(A)	(B)	For Hole Size	For Hole Size Tolerance	Ht.	Dia.	Ht.		Pair







			Steel

			1/2"	9/16"	5/8"	-0.0005" to 0.0005"	1/4"	5/8"	15/32"	3082N22	000000


			5/8"	11/16"	5/8"	-0.0005" to 0.0005"	1/4"	5/8"	15/32"	3082N18	00000
			3/4"	13/16"	5/8"	-0.0005" to 0.0005"	1/4"	5/8"	15/32"	3082N19	00000
			7/8"	1"	5/8"	-0.0005" to 0.0005"	1/4"	5/8"	15/32"	3082N21	00000
			14 mm	16 mm	5/8"	-0.0005" to 0.0005"	6 mm	5/8"	11.9 mm	3082N23	00000
			18 mm	20 mm	5/8"	-0.0005" to 0.0005"	6 mm	5/8"	11.9 mm	3082N24	00000
			20 mm	22 mm	5/8"	-0.0005" to 0.0005"	6 mm	5/8"	11.9 mm	3082N25	00000

Ball-Lock Quick-Change Fixture Clamps

Build these components into fixture plates, machine subplates, and tombstones for quick changes. The system clamps and locates at the same time for accurate positioning with repeatability of ±0.0005". Components are compatible with Jergens Ball-Lock, Carr-Lane Carr Lock, and Kurt PinLock quick change systems.

For accurate positioning, at least two sets of clamps, liners, and receivers are required. Install the receivers in the base plate and the liners in the fixture plate. Then line up the two plates, insert the clamps, and tighten their screws to secure the fixture in place. If more holding capacity is needed, use additional clamps and receivers but omit liners to prevent the clamp from getting stuck in the fixture plate.

Clamps

	Shank		Head
For Fixture Plate Thk.	Dia., mm	Lg.	Dia.	Thk.	Hex Key Size	For Fixture Plate Thk. Tolerance	Holding Cap., lb.	Material	Includes		Each
1/2"	13	1.08"	7/8"	1/4"	3/32"	-0.005" to 0.005"	625	Black-Oxide Steel	Hex Key Set Screw	1349N41	0000000
1/2"	16	1.15"	1 1/2"	5/16"	1/8"	-0.005" to 0.005"	800	Black-Oxide Steel	Hex Key Set Screw	1349N11	000000
3/4"	13	1.33"	7/8"	1/4"	3/32"	-0.005" to 0.005"	625	Black-Oxide Steel	Hex Key Set Screw	1349N42	000000
3/4"	16	1.40"	1 1/2"	5/16"	1/8"	-0.005" to 0.005"	800	Black-Oxide Steel	Hex Key Set Screw	1349N43	000000
3/4"	20	1.53"	1 3/4"	3/8"	1/8"	-0.005" to 0.005"	2,250	Black-Oxide Steel	Hex Key Set Screw	1349N12	000000
3/4"	25	1.70"	2"	3/8"	5/32"	-0.005" to 0.005"	5,440	Black-Oxide Steel	Hex Key Set Screw	1349N44	000000
1"	20	1.78"	1 3/4"	3/8"	1/8"	-0.005" to 0.005"	2,250	Black-Oxide Steel	Hex Key Set Screw	1349N45	000000
1"	25	1.95"	2"	3/8"	5/32"	-0.005" to 0.005"	5,400	Black-Oxide Steel	Hex Key Set Screw	1349N13	000000

Hole Liners

For Fixture Plate Thk.	For Clamp Shank Dia., mm	OD	OD Tolerance	For Fixture Plate Thk. Tolerance	Material		Each
1/2"	13	0.7518"	-0.0004" to 0"	-0.005" to 0.005"	Black-Oxide Steel	1349N54	000000
1/2"	16	1.0018"	-0.0004" to 0"	-0.005" to 0.005"	Black-Oxide Steel	1349N33	00000
3/4"	13	0.7518"	-0.0004" to 0"	-0.005" to 0.005"	Black-Oxide Steel	1349N55	00000
3/4"	16	1.0018"	-0.0004" to 0"	-0.005" to 0.005"	Black-Oxide Steel	1349N56	00000
3/4"	20	1.3772"	-0.0004" to 0"	-0.005" to 0.005"	Black-Oxide Steel	1349N34	00000
3/4"	25	1.3772"	-0.0004" to 0"	-0.005" to 0.005"	Black-Oxide Steel	1349N57	00000
1"	20	1.3772"	-0.0004" to 0"	-0.005" to 0.005"	Black-Oxide Steel	1349N58	00000
1"	25	1.3772"	-0.0004" to 0"	-0.005" to 0.005"	Black-Oxide Steel	1349N35	00000

Receiver Plugs

Push receiver plugs into unused receivers to prevent chips and coolant from accumulating during machining. When installed, plugs sit flush with the surface of the fixture plate. To remove, thread a screw into the tapped hole in the center and pull up.

For Clamp Shank Dia., mm	Lg., mm	Thread Size	Material
13	8	M4 × 0.7 mm	Aluminum	1349N72
16	8	M4 × 0.7 mm	Aluminum	1349N73
20	8	M4 × 0.7 mm	Aluminum	1349N74
25	10	M4 × 0.7 mm	Aluminum	1349N75

Receiver Bushings

For Min. Base Plate Thk.	For Clamp Shank Dia., mm	OD	Bolt Circle Dia.	OD Tolerance	Material	No. of Mounting Holes	Mounting Fasteners Included		Each
3/4"	13	1.3750"	0.984"	-0.0004" to 0"	Black-Oxide Steel	3	Yes	1349N67	000000
3/4"	16	1.4370"	1.125"	-0.0004" to 0"	Black-Oxide Steel	3	Yes	1349N26	00000
1"	20	1.6873"	1.362"	-0.0004" to 0"	Black-Oxide Steel	3	Yes	1349N27	00000
1 1/4"	25	2.0623"	1.644"	-0.0004" to 0"	Black-Oxide Steel	3	Yes	1349N28	00000

Quarter-Turn Quick-Change Fixture Clamps

Install these clamps into fixture plates, machine subplates, and tombstones to quickly swap components in or out of your machining setup. They lock or unlock with the turn of a knob. Since they locate while they clamp, you can accurately position components with repeatability of ±0.1".

For accurate positioning, use at least two sets of clamps and cam receptacles. Install receptacles into a base plate and clamps into a fixture plate. Line up the two plates, insert the clamps into the receptacles, then turn the knobs to secure your fixture in place. If you need more holding capacity, use additional clamps and receptacles.

Clamps

For Fixture Plate Thk.		Shank			Head
Min.	Max.	Dia., mm	Lg.	Material	Dia.	Thk.	Material	Knob Material	Holding Cap., lb.		Each



	1/8"	3/8"	5	0.61"	Stainless Steel	1"	1/4"	Stainless Steel	Nylon	10	9952N121	000000


	1/8"	1/2"	8	0.67"	Stainless Steel	1 3/8"	7/16"	Stainless Steel	Nylon	20	9952N126	00000
	1/2"	3/4"	8	0.91"	Stainless Steel	1 3/8"	7/16"	Stainless Steel	Nylon	20	9952N127	00000

Cam Receptacles


Fastener Mount	Thread In

Fastener Mount—Fastener-mount receptacles have three recessed holes on the face so you can secure them to your base plate with the included screws.

Thread In—Thread-in receptacles have a threaded body for installation in a tapped hole. You hold them in place with the included nut, so they’re good for thin base plates.

	For Fixture Plate Thk.
	Min.	Max.	For Clamp Shank Dia., mm	Dia.	Thk.	Thread Size	Material	Mounting Fasteners Included		Each
Fastener Mount



		3/8"	Not Rated	5	1"	3/8"	—	Nickel-Plated Steel	Yes	9952N122	000000


		1/2"	Not Rated	8	1 1/4"	7/16"	—	Nickel-Plated Steel	Yes	9952N124	00000


		Thread In



				1/4"	3/8"	5	1"	5/8"	M14 × 1.5 mm	Nickel-Plated Steel	—	9952N123	00000


				1/4"	1/2"	8	1 1/4"	11/16"	M20 × 1.5 mm	Nickel-Plated Steel	—	9952N125	00000

Spacers

Use spacers for fixture plates that are less than _1/4" thick.

For Fixture Plate Thk.
Min.	Max.	For Clamp Shank Dia., mm	Dia.	Thk.	Material	Mounting Fasteners Included		Each



	1/8"	1/4"	5	1"	1/8"	Stainless Steel	Yes	9952N128	000000


	1/8"	1/4"	8	1 3/8"	1/8"	Stainless Steel	Yes	9952N129	00000