Bore Clamps | McMaster-Carr

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21 Products

Inside Diameter Fixture Clamps


		Top Actuation

Secure a workpiece from the inside diameter, leaving the outside clear for machining. Machine these clamps to match the precise size and contours of your workpiece ID. Mount the clamp to your fixture with the included screws and place your workpiece over it. Turn the socket head cap screw to expand the clamp.

Top Actuation—Top-actuated clamps tighten from the top of the clamp, so workpieces need a through hole.

						Thread		Drive
	For ID Range	Max. Clamp Expansion	Ht.	Flange OD	Max. Clamping Force, lbf	Size	Lg.	Size	Style	Mounting Fasteners Included	No. of Mounting Holes	Material	Screw Material		Each
Top Actuation



		0.16" to 0.29"	0.005"	27/64"	25/32"	250	2-56	1/2"	5/64"	Hex	Yes	3	Steel	Steel	1341N11	000000


		0.28" to 0.49"	0.01"	55/64"	1 11/64"	950	8-32	1"	9/64"	Hex	Yes	3	Steel	Steel	1341N12	00000
		0.48" to 0.56"	0.013"	63/64"	1 15/64"	1,900	1/4"-20	1 1/4"	3/16"	Hex	Yes	3	Steel	Steel	1341N13	00000
		0.53" to 0.79"	0.015"	63/64"	1 15/32"	2,500	5/16"-18	1 1/4"	1/4"	Hex	Yes	3	Steel	Steel	1341N14	00000
		0.71" to 1.06"	0.015"	1 1/8"	1 31/32"	4,500	3/8"-16	1 1/2"	5/16"	Hex	Yes	3	Steel	Steel	1341N15	00000
		0.9" to 1.39"	0.015"	1 1/4"	2 13/64"	5,900	1/2"-13	1 1/2"	3/8"	Hex	Yes	3	Steel	Steel	1341N16	00000
		1.15" to 1.65"	0.015"	1 9/16"	2 47/64"	10,000	5/8"-11	1 3/4"	1/2"	Hex	Yes	3	Steel	Steel	1341N17	000000
		1.15" to 2.03"	0.015"	1 9/16"	2 31/32"	10,000	5/8"-11	1 3/4"	1/2"	Hex	Yes	3	Steel	Steel	1341N18	000000
		1.15" to 3.06"	0.015"	1 51/64"	4 15/64"	10,000	5/8"-11	2"	1/2"	Hex	Yes	3	Steel	Steel	1341N19	000000
		4.1 mm to 7.4 mm	0.13 mm	10.7 mm	20 mm	250	M2 × 0.4 mm	12 mm	1.5 mm	Hex	Yes	3	Steel	Steel	1341N311	00000
		7.1 mm to 12.4 mm	0.25 mm	21.8 mm	29.72 mm	950	M4 × 0.7 mm	25 mm	3 mm	Hex	Yes	3	Steel	Steel	1341N312	00000


		12.2 mm to 14.2 mm	0.33 mm	24.9 mm	31.5 mm	1,900	M6 × 1 mm	30 mm	5 mm	Hex	Yes	3	Steel	Steel	1341N313	00000
		13.5 mm to 20 mm	0.38 mm	24.9 mm	37.5 mm	2,500	M8 × 1.25 mm	30 mm	6 mm	Hex	Yes	3	Steel	Steel	1341N314	00000
		18 mm to 27 mm	0.38 mm	28.6 mm	50 mm	4,500	M10 × 1.5 mm	35 mm	8 mm	Hex	Yes	3	Steel	Steel	1341N315	00000
		23 mm to 35.3 mm	0.38 mm	31.8 mm	56 mm	5,900	M12 × 1.75 mm	40 mm	10 mm	Hex	Yes	3	Steel	Steel	1341N316	00000
		29.3 mm to 42 mm	0.38 mm	39.6 mm	69.5 mm	10,000	M16 × 2 mm	45 mm	14 mm	Hex	Yes	3	Steel	Steel	1341N317	000000
		29.3 mm to 51.5 mm	0.38 mm	39.6 mm	75.5 mm	10,000	M16 × 2 mm	45 mm	14 mm	Hex	Yes	3	Steel	Steel	1341N318	000000
		29.3 mm to 77.7 mm	0.38 mm	45.5 mm	107.5 mm	10,000	M16 × 2 mm	50 mm	14 mm	Hex	Yes	3	Steel	Steel	1341N319	000000

Inside Diameter Fixture Clamps for Castings and Rough Parts

These clamps wedge against the workpiece ID to grip cast, unfinished, or uneven parts, leaving the outside clear for machining. Do not use these clamps on smooth or finished ID’s because they will leave a mark. The clamp’s screw tightens from the top of the clamp, so workpieces require a through hole. Thread the clamp into a tapped hole in your fixture and place your workpiece over it. Reach through the hole to turn the screw, expanding the clamp.

					Thread		Drive
For ID Range	Max. Clamp Expansion	Overall Ht.	Body Ht.	Max. Clamping Force, lbf	Size	Lg., mm	Size, mm	Style	Mounting Fasteners Included	Material	Screw Material		Each



	0.768" to 0.945"	0.178"	29/64"	23/64"	450	M4 × 0.7 mm	12	3	Hex	Yes	Steel	Steel	3071N11	000000


	0.925" to 1.142"	0.217"	43/64"	33/64"	1,120	M6 × 1 mm	18	5	Hex	Yes	Steel	Steel	3071N12	00000
	1.122" to 1.417"	0.295"	7/8"	43/64"	2,000	M8 × 1.25 mm	25	6	Hex	Yes	Steel	Steel	3071N13	00000