Eccentric Head Screws | McMaster-Carr

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38 Products

Fixture Clamps

Hold a workpiece securely from the side with minimal contact, leaving more of the workpiece free for machining. Thread the clamp into a tapped hole and give the center screw a half turn for quick clamping.

Stainless Steel Head—Stainless steel clamps are a good choice to avoid corrosion when working with stainless steel workpieces or building a fixture from stainless steel.

Head					Thread		Drive			Each		Package
Wd.	Ht.	Max. Movement	Material	Max. Clamping Force, lbf	Size	Lg.	Size	Style	Screw Material		Each	Pkg. Qty.		Pkg.



	5/16"	7/64"	0.03"	Brass	200	8-32	11/32"	5/64"	Hex	Steel	84865A31	00000	10	84865A61	000000


	1/2"	5/32"	0.04"	Brass	350	10-32	11/32"	3/32"	Hex	Steel	84865A13	0000	10	84865A63	00000
	5/8"	3/16"	0.04"	Brass	800	1/4"-20	15/32"	1/8"	Hex	Steel	84865A12	0000	10	84865A62	00000
	5/8"	3/16"	0.04"	Stainless Steel	800	1/4"-20	15/32"	1/8"	Hex	Stainless Steel	84865A35	00000	—	———	0
	13/16"	3/16"	0.04"	Brass	800	5/16"-18	15/32"	3/16"	Hex	Steel	84865A34	0000	12	84865A64	00000
	13/16"	3/16"	0.04"	Brass	800	5/16"-24	15/32"	3/16"	Hex	Steel	84865A33	0000	12	84865A66	00000
	13/16"	1/4"	0.05"	Brass	2,000	3/8"-16	23/32"	3/16"	Hex	Steel	84865A14	0000	10	84865A68	00000
	1"	3/8"	0.1"	Brass	4,000	1/2"-13	29/32"	5/16"	Hex	Steel	84865A15	00000	8	84865A65	00000
	1 3/16"	1/2"	0.1"	Brass	6,000	5/8"-11	1 1/8"	3/8"	Hex	Steel	84865A47	00000	4	84865A67	00000
	7.93 mm	2.8 mm	0.76 mm	Brass	200	M4 × 0.7 mm	10 mm	3 mm	Hex	Steel	84865A81	0000	10	84865A91	00000
	15.86 mm	4.75 mm	1.01 mm	Brass	750	M6 × 1 mm	11.2 mm	4 mm	Hex	Steel	84865A82	0000	10	84865A92	00000


	20.61 mm	4.55 mm	1.01 mm	Brass	750	M8 × 1.25 mm	15 mm	5 mm	Hex	Steel	84865A83	0000	12	84865A93	00000
	20.61 mm	6.35 mm	1.27 mm	Brass	1,950	M10 × 1.5 mm	19 mm	7 mm	Hex	Steel	84865A84	00000	10	84865A94	00000
	25.38 mm	9.52 mm	2.03 mm	Brass	3,950	M12 × 1.75 mm	22.8 mm	8 mm	Hex	Steel	84865A85	00000	8	84865A95	00000
	30.13 mm	12.7 mm	2.54 mm	Brass	5,950	M16 × 2 mm	28.5 mm	12 mm	Hex	Steel	84865A86	00000	4	84865A96	00000

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



		4.1 to 7.4	0.13	10.7	20	250	M2 × 0.4 mm	12	1.5	Hex	Yes	3	Steel	Steel	1341N311	000000


		7.1 to 12.4	0.25	21.8	29.72	950	M4 × 0.7 mm	25	3	Hex	Yes	3	Steel	Steel	1341N312	00000
		12.2 to 14.2	0.33	24.9	31.5	1,900	M6 × 1 mm	30	5	Hex	Yes	3	Steel	Steel	1341N313	00000
		13.5 to 20	0.38	24.9	37.5	2,500	M8 × 1.25 mm	30	6	Hex	Yes	3	Steel	Steel	1341N314	00000
		18 to 27	0.38	28.6	50	4,500	M10 × 1.5 mm	35	8	Hex	Yes	3	Steel	Steel	1341N315	00000
		23 to 35.3	0.38	31.8	56	5,900	M12 × 1.75 mm	40	10	Hex	Yes	3	Steel	Steel	1341N316	00000
		29.3 to 42	0.38	39.6	69.5	10,000	M16 × 2 mm	45	14	Hex	Yes	3	Steel	Steel	1341N317	000000
		29.3 to 51.5	0.38	39.6	75.5	10,000	M16 × 2 mm	45	14	Hex	Yes	3	Steel	Steel	1341N318	000000
		29.3 to 77.7	0.38	45.5	107.5	10,000	M16 × 2 mm	50	14	Hex	Yes	3	Steel	Steel	1341N319	000000