Spread Fixture Clamps | McMaster-Carr

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System of Measurement

Clamping Action

Thread Size

Flange OD

Actuation Location

Height

Clamp Type

Material

Maximum Clamp Expansion

Drive Size

Drive Style

Number of Mounting Holes

Handle Style

Thread Length

Maximum Clamping Force

Export Control Classification Number (ECCN)

EAR99

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Yes

Screw Material

Steel

DFARS Specialty Metals

REACH

RoHS

Holding Capacity

1,000 lb. to 1,999 lb.

Body Material

Reach Length

Thread Pitch

44 Products

Inside Diameter Fixture Clamps


Top Actuation	Side 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.

Side Actuation—Side-actuated clamps tighten from the side of the clamp, gripping parts without a through hole in the top.

						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
		1.15" to 4.06"	0.015"	1 51/64"	5 15/64"	10,000	5/8"-11	2"	1/2"	Hex	Yes	3	Steel	Steel	1341N22	000000
		1.15" to 6.89"	0.02"	1 51/64"	5 15/64"	10,000	5/8"-11	2"	1/2"	Hex	Yes	4	Steel	Steel	1341N23	000000


		1.15" to 9.85"	0.08"	1 51/64"	6"	6,000	5/8"-11	2"	1/2"	Hex	Yes	4	Aluminum	Steel	1341N24	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


		Side Actuation



				0.71" to 1.12"	0.012"	1 5/8"	1 31/32"	4,000	—	—	1/4"	Hex	Yes	6	Steel	Steel	1341N21	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

Fast-Action Bar Clamps/Spreaders


Shown as Spreader

Each arm slides freely for quick, one-handed positioning. They lock when the screws are tightened onto a workpiece. Reverse the arms to use these clamps as spreaders.

Opening		Spreader Opening
Max.	Min.	Max.	Min.	Reach Lg.	Holding Cap., lb.	Body Material	Screw Material		Each
16"	0"	30"	13 1/2"	4 3/4"	1,450	Steel	Black-Oxide Steel	2479N11	0000000
39 1/2"	0"	49"	13 1/2"	4 3/4"	1,450	Steel	Black-Oxide Steel	2479N12	000000
60"	0"	68"	13 1/2"	4 3/4"	1,450	Steel	Black-Oxide Steel	2479N13	000000

Trigger-Action Bar Clamps/Spreaders

Shown as Spreader

Image of Product. Front orientation. Contains Annotated. Bar Clamps. Trigger-Action Bar Clamps/Spreaders.

Reverse the arms to use these clamps as spreaders. Press the trigger to slide the clamping arm along the bar. Release the trigger and squeeze the pistol-grip handle to lock the clamp in place.

	Opening		Spreader Opening
	Max.	Min.	Max.	Min.	Reach Lg.	Body Material		Each
300 lb. Holding Capacity



		6"	0"	12 1/2"	7 1/2"	2 1/4"	Steel	51755A6	000000


		12"	0"	18 1/2"	7 1/2"	2 1/4"	Steel	51755A7	00000
		18"	0"	24 1/2"	7 1/2"	2 1/4"	Steel	51755A11	00000
		24"	0"	30 1/2"	7 1/2"	2 1/4"	Steel	51755A12	00000
		36"	0"	42 1/2"	7 1/2"	2 1/4"	Steel	51755A13	00000


		600 lb. Holding Capacity



				6"	0"	14 7/8"	9 1/4"	3 5/8"	Steel	51755A21	00000


				12"	0"	20 1/2"	9"	2 3/4"	Steel	51755A22	00000
				18"	0"	26 1/2"	9"	2 3/4"	Steel	51755A23	00000
				24"	0"	32 1/2"	9"	2 3/4"	Steel	51755A24	00000
				36"	0"	44 1/2"	9"	2 3/4"	Steel	51755A25	00000
				50"	0"	58 1/2"	9"	2 3/4"	Steel	51755A26	00000

Parallel-Jaw Bar Clamps/Spreaders


	Shown as Spreader

The large, flat jaws remain parallel when clamping to apply even pressure without denting or marring the workpiece. Reverse the arms to use these clamps as spreaders. Pull the handle to lock or release the clamping arm.

Opening		Spreader Opening
Max.	Min.	Max.	Min.	Reach Lg.	Holding Cap., lb.	Body Material	Arm Material	Screw Material		Each
12"	0"	15 5/16"	10 1/2"	3 3/4"	1,000	Steel	Plastic	Steel	5022A11	000000
18"	0"	21 1/2"	10 1/2"	3 3/4"	1,000	Steel	Plastic	Steel	5022A13	00000
24"	0"	28 3/4"	10 1/2"	3 3/4"	1,000	Steel	Plastic	Steel	5022A15	00000
40"	0"	44 1/2"	10 1/2"	3 3/4"	1,000	Steel	Plastic	Steel	5022A17	00000
50"	0"	52 1/2"	10 1/2"	3 3/4"	1,000	Steel	Plastic	Steel	5022A18	00000