Pipe Alignment Clamps | McMaster-Carr

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92 Products

Pipe Welding Clamps

External Clamping—Thumb

Screw Adjustment

External Clamping—Self-Centering

Internal

Clamping—Self-Centering

Hold pipe and fittings together for tack welding. These clamps can be used to weld two pipes of similar or different diameters, or they can be used to weld a pipe to a flange. With a rugged build, they’re designed for use with heavy pipe.

External Clamping—External clamps work well when you can’t access the inside of your pipe. However, you may need to rotate them during welding to move them out of the way.

Internal Clamping—Internal clamps don’t obstruct welding, making the process faster and simpler. One side of these two-part clamps expands with a knob while the other expands with a hand bar, so you can set them at different diameters to join pipe and flanges of varying sizes.

Thumb Screw Adjustment—Clamps with thumb screws hold fittings or flanges at three separate points—adjust them manually to center the two pieces being joined.

Self-Centering—Self-centering clamps consist of two clamps that share a center line even as you attach each to a different piece of pipe, so the pipes stay aligned with no manual adjustment needed.

	For Pipe		Steel Body		Stainless Steel Body
	OD	Size		Each		Each
External Clamping—Thumb Screw Adjustment



		1" to 3"	3/4 to 2 1/2	2530N31	0000000	———	0


		2" to 6"	2 to 5	2530N12	000000	———	0
		6" to 14"	6 to 12	2530N33	000000	———	0


		External Clamping—Self-Centering



				1/8" to 3"	1/8 to 2 1/2	———	0	2530N22	0000000


				1 1/2" to 5"	1 1/4 to 4	———	0	2530N23	000000


				Internal Clamping—Self-Centering



						2" to 6"	2 to 5	———	0	2530N15	000000


						4" to 8"	3 1/2 to 7	———	0	2530N16	000000
						6" to 14"	6 to 14	———	0	2530N17	00000000

Heavy Duty Chain Pipe Welding Clamps


Straight Clamps	Flange Clamps

Adjustable Clamps

The open clamp design permits welding around almost the entire pipe circumference. Secure components with chains and tighten the handles.

Straight Clamps—Straight clamps are for use with two lengths of straight pipe and with reducers.

Flange Clamps—Flange clamps are for flanges and straight pipe.

Adjustable Clamps—Adjustable clamps are for use with straight pipe, elbows, tees, reducers, and risers. They pivot on a hinge to hold components at any angle from 90° to 180°.

Aluminum Body—Aluminum clamps are lighter in weight than iron clamps.

Iron Body—Iron clamps are more durable than aluminum.

	For Pipe		Aluminum Body		Iron Body
	OD	Size		Each		Each
Straight Clamps



		1/2" to 8"	1/4 to 6	5053A1	0000000	5053A2	0000000


		8" to 16"	8 to 16	5053A3	000000	5053A4	000000


		Flange Clamps



				2 1/2" to 8"	2 1/2 to 6	5053A5	000000	———	0


				Adjustable Clamps



						2 1/8" to 8"	2 to 6	5053A7	000000	———	0

Pipe Flange Alignment Kits

Hand-Crank Alignment

Ratchet Alignment

Hydraulic Alignment

Align flanges on heavy pipes when alignment pins don't fit through the flange holes. Often used for pipefitting, welding, and maintenance, these kits make it possible to correct angular and offset misalignment on a range of pipe sizes.

Choose an alignment mechanism based on how much force you need to move the pipe. If you're not sure, measure the flange hole diameter—it correlates to the pressure class and size of your pipe. Larger pipes typically require more force.

Hand-Crank Alignment—Hand-crank aligners are best for routine maintenance and quick repairs. As you turn the hand crank, it moves the pipe.

Ratchet Alignment—Ratchet aligners produce four times as much force as hand crank aligners. Position the tool's arm through a flange hole on the pipe you plan to move, and place the lead screw on the edge of the stationary pipe's flange. Wrap the strap around the pipe you plan to move. As you rotate the lead screw with a wrench, the misaligned pipe moves into position.

Hydraulic Alignment—Hydraulic aligners are best for severe misalignment—they generate over twice as much force as ratcheting aligners. Position the tool's arm through the flange hole on the pipe you plan to move, and place the lead screw on the edge of the stationary pipe's flange. Wrap the strap around the pipe you plan to move. As you press down on the hand pump connected to the lead screw, the pipe moves.

Alignment Mechanism	Wt. Cap., lb.	For Min. Flange Hole Dia.	Includes	Container Type		Each
Hand Crank	2,400	5/8"	Strap	—	7068N11	000000000
Ratchet	9,900	1"	Socket, Strap, Wrench	Plastic Carrying Case	7068N12	00000000
Hydraulic	22,200	1 3/8"	Hand Pump with Gauge, Hydraulic Cylinder, Hydraulic Hose, Strap	Plastic Carrying Case	7068N13	00000000

Stepped Pipe Flange Aligner Pins

Each step on these aligner pins matches common bolt holes on pipe flanges, so they're more precise than conical aligner pins and don’t require nuts. Press the pair of pins into mated flanges to make sure the flanges are aligned. Once two sets of holes are aligned, you'll know the rest of the holes are as well. Made of durable chrome-plated steel, they'll hold their shape over time and resist rust.

	Lg.		Pair
Chrome-Plated Steel



	3/8" to 3/4"	3 5/8"	7356N13	000000


	3/4" to 1 1/4"	5 1/2"	7356N12	00000
	3/4" to 1 3/8"	8"	7356N11	00000

Bench Vise Jaws

Replace worn flat and V jaws.

For Wilton


Flat Jaw	V-Jaw

V-Jaw—V Jaws (also known as pipe jaws) securely grip pipe and other round objects.

			Overall			Mounting		Steel Jaw
	For Mfr. Model No.	Jaw Texture	Wd.	Ht.	Thk.	Fasteners Included	Hole Ctr.-to-Ctr.		Each
Flat Jaw



		10006, 10056, 300N, 300S	Serrated	3"	3/4"	1/2"	Yes	2"	8467A12	0000000


		10011, 10066, 10200, 350N, 350S, C-0	Serrated	3 1/2"	1 1/4"	5/8"	Yes	2 3/8"	8467A32	000000
		10016, 10076, 400N, 400S	Serrated	4"	1 1/4"	5/8"	Yes	2 3/8"	8467A34	000000
		10021, 10086, 10225, 450N, 450S, C-1	Serrated	4 1/2"	1 1/4"	5/8"	Yes	2 3/8"	8467A35	000000
		10026, 10096, 500N, 500S	Serrated	5"	1 1/4"	5/8"	Yes	2 3/8"	8467A36	000000
		10031, 10107, 600N, 600S	Serrated	6"	1 1/2"	1"	Yes	2 3/8"	8467A17	000000
		10036, 10116, 800N, 800S	Serrated	8"	1 1/2"	1"	Yes	6"	8467A18	000000
		10250, C-2	Serrated	5"	1"	5/8"	Yes	2 3/8"	5200A151	000000
		10275, C-3	Serrated	6"	1 3/8"	9/16"	Yes	4"	5200A779	000000
		11126, 674	Serrated	4 1/2"	15/16"	1/2"	Yes	2 1/2"	5310A45	00000
		11127, 675	Serrated	5 1/2"	3/4"	3/8"	Yes	2 1/2"	5310A46	00000


		11128, 676	Serrated	6 1/2"	3/4"	7/8"	Yes	2 1/2"	5310A47	00000
		14500, 4500	Serrated	5 1/2"	3/4"	1/2"	Yes	3 1/2"	8467A25	00000
		1550, 21400, 63187, 745	Serrated	5"	3/4"	1/2"	Yes	2 3/8"	8467A27	00000
		1560, 21500, 63188, 746	Serrated	6"	1"	5/8"	Yes	4"	8467A28	00000
		1745, 63199	Serrated	4 1/2"	3/4"	1/2"	Yes	2 3/8"	5344A35	000000
		1755, 63200	Serrated	5 1/2"	3/4"	1/2"	Yes	2 3/8"	5344A36	000000
		1765, 63201	Serrated	6 1/2"	1"	5/8"	Yes	2 3/8"	5344A37	000000
		1780, 1780A, 63202	Serrated	8"	1"	5/8"	Yes	4"	5344A38	000000
		191, 656HD	Serrated	6 1/8"	1"	1/2"	Yes	4"	5310A35	00000
		21300, 744	Serrated	4"	3/4"	1/2"	Yes	2 3/8"	8467A26	00000


		21800, 748A	Serrated	8"	1"	1/2"	Yes	4"	8467A31	00000
		63198, 63244, CBV-65, SBV-65	Serrated	2 1/2"	1/2"	1/4"	Yes	1 5/8"	8467A91	00000
		63247, 63248, CBV-100, SBV-100	Serrated	4"	7/8"	1/2"	Yes	2 3/8"	8467A92	00000
		63300, WS4	Serrated	3 7/8"	3/4"	3/8"	Yes	2 3/8"	5310A71	00000
		63301, WS5	Serrated	4 7/8"	13/16"	7/16"	Yes	3"	5310A72	00000
		63302, WS6	Serrated	5 15/16"	13/16"	1/2"	Yes	3 1/2"	5310A73	00000
		63304, WS8	Serrated	7 7/8"	1 1/8"	5/8"	Yes	4 3/4"	5310A74	00000


		V-Jaw



				10200, C-0, 1780, 63202, 63402	Serrated	1"	2 1/4"	1 1/2"	Yes	—	5344A39	000000


				10225, C-1	Serrated	1 1/8"	2 3/4"	1 3/4"	Yes	—	5200A121	000000
				10250, C-2	Serrated	1 1/4"	3 1/4"	1 3/4"	Yes	—	5200A131	000000
				10275, C-3	Serrated	1 1/4"	3 1/4"	2"	Yes	—	5200A141	000000
				1550, 21400, 63187, 745, 1560, 21500, 63188, 746, 21300, 744, 21800, 748A	Serrated	9/16"	1 3/4"	1 1/8"	Yes	2 1/2"	8467A29	00000
				1745, 63199, 1755, 63200, 1765, 63201, 1740, 1750, 1760, 2040, 2050	Serrated	9/16"	1 3/4"	1 1/8"	Yes	—	5344A41	00000

For Yost


Flat Jaw	V-Jaw

V-Jaw—V Jaws (also known as pipe jaws) securely grip pipe and other round objects.

			Overall			Mounting			Steel Jaw
	For Mfr. Model No.	Jaw Texture	Wd.	Ht.	Thk.	Fasteners Included	Hole Dia.	Hole Ctr.-to-Ctr.		Each
Flat Jaw



		103-1/2, 131C, 203-1/2, 31C	Serrated	1"	3 1/2"	1/2"	Yes	23/64"	2"	5289A112	000000


		104-1/2, 132C, 204-1/2, 32C	Serrated	1"	4 1/2"	1/2"	Yes	23/64"	2"	5289A122	000000
		45C	Serrated	4 1/2"	1"	1/2"	Yes	23/64"	2"	5344A52	00000
		55C	Serrated	5 1/2"	1"	1/2"	Yes	23/64"	4"	5344A54	00000
		65C	Serrated	6 1/2"	1"	1/2"	Yes	23/64"	5"	5344A55	00000
		904-AS, 904-HV-AS, WRBV-4	Serrated	4"	3/4"	3/8"	Yes	21/64"	2 3/4"	5333A24	00000
		905-AS, 905-HV-AS, WRBV-5	Serrated	5"	7/8"	1/2"	Yes	21/64"	3 27/64"	5333A25	00000
		906-AS, 906-HV-AS, WRBV-6	Serrated	6"	7/8"	1/2"	Yes	21/64"	4 17/64"	5333A26	00000


		V-Jaw



				131C, 31C, 132C, 32C, 45C, 55C, 65C	Serrated	2 1/2"	2"	1/2"	Yes	35/64"	—	5289A121	000000


				133C, 33C, 80C	Serrated	3 1/4"	2"	1/2"	Yes	35/64"	—	5289A131	000000
				134C, 34C	Serrated	4 1/2"	2"	3/4"	Yes	35/64"	—	5289A141	000000

For Morgan-Milwaukee

Flat Jaw

			Overall			Mounting			Steel Jaw
	For Mfr. Model No.	Jaw Texture	Wd.	Ht.	Thk.	Fasteners Included	Hole Dia.	Hole Ctr.-to-Ctr.		Each
Flat Jaw



		130, 30	Serrated	3"	1"	1"	Yes	—	—	8469A21	0000000


		135, 35	Serrated	3 1/2"	1"	1"	Yes	—	—	8469A22	000000
		140, 40	Serrated	4"	1 1/4"	1"	Yes	—	—	8469A23	000000
		145, 45	Serrated	4 1/2"	1 1/4"	1"	Yes	—	—	8469A24	000000
		150, 50	Serrated	5"	1 1/4"	1"	Yes	—	—	8469A25	000000
		160, 60	Serrated	6"	1 3/8"	1/2"	Yes	17/64"	2"	8469A48	000000
		180, 80	Serrated	8"	1 1/2"	1/2"	Yes	17/64"	2"	8469A49	000000

Magnetic Pipe Flange Aligners with Level

Ensure an even seal around your flange—these tools align and level flanges in a single step. The strong magnets make sure your bolt holes are perfectly inline horizontally and that your flange isn’t tilted. If your flange is made of stainless steel or another nonmagnetic material, secure these aligners using the included threaded cones.

	For Max. Flange Hole Ctr.-to-Ctr. Distance	Level Lg.	Aligner Connection Method	Includes	Cone Material	Magnet Material	Container Type		Each
Aluminum Body



	1/2" to 2"	9 1/2"	10 1/2"	Magnetic	Threaded Cones	Steel	Neodymium	Carrying Case	7049N11	0000000

Pipe Flange Aligner Pins with Horizontal Level

Ensure horizontal alignment of pipe flanges with a level rod that runs between two alignment pins. One pin in each pair has a level for vertical alignment. Insert these nut-and-bolt pins into adjacent flange holes and tighten to align flanges before connecting two pipes.

	Aligner Connection Method	Rod Lg.		Each
Steel



	1/2" to 1 7/16"	Screw Together	10"	2745A241	0000000


	1/2" to 1 15/16"	Screw Together	18"	2745A242	000000

Pipe Flange Aligner Pins

Insert a pair of these nut-and-bolt pins into adjacent flange holes and tighten to align flanges before connecting two pipes. One pin in each pair has a level for vertical alignment. Use a separate level to align the flange horizontally. Also known as two-hole pins.

4 1/2" Lg. Extension—Pins with a 4 ½” length extension let you increase the length of your pins to align thicker flanges.

Two Couplings—Use the included couplings to connect the extension to your pins.

	For Flange
	Hole Dia.	Thk.	Aligner Connection Method	Includes		Pair
Steel



		5/16" to 15/16"	1"	Screw Together	—	2298A21	000000


		1/2" to 1 7/16"	2 1/2"	Screw Together	—	2298A14	00000
		1/2" to 1 15/16"	4"	Screw Together	—	2298A15	000000
		5/8" to 3"	9"	Screw Together	4 1/2" Lg. Extension, Two Couplings	2298A22	000000

Replacements for Pipe Flange Aligners

For Flange Hole Dia.	Material	Lg.		Each
5/8" to 3"	Steel	1"	2298A25	00000

For Flange Hole Dia.	Material	Lg.		Each
5/8" to 3"	Steel	2 7/8"	2298A23	00000
5/8" to 3"	Steel	4 1/2"	2298A24	0000

High-Visibility Bench Vises

A bright yellow vise body stands out on the shop floor. In addition to flat jaws, these vises have V jaws (also known as pipe jaws) that securely grip pipe and other round objects. The base swivels 360° and can be locked in place.

With Flat and V-Jaws

Image of Product. Front orientation. Contains Annotated, Inset. Vises. High-Visibility Bench Vises.

	Vises																			Replacement Flat Jaws
	Flat Jaw						Overall							Mounting Holes
	Wd.	Max. Opening	Material	Texture	V Jaw For Dia.	Throat Dp.	Lg.	Wd.	Ht.	Wt., lb.	Body Material	Mount Type	Mounting Fasteners Included	No. of	Dia.	Features	Specs. Met		Each		Each
360° Swivel Base



		4"	4"	Steel	Serrated	1/4" to 1 1/2"	2 1/4"	12 1/2"	5 1/2"	6"	17	Painted Steel	Bolt On	No	3	1/2"	Anvil	OSHA Compliant 29 CFR 1910.144	5333A21	0000000	5333A24	000000


		5"	5"	Steel	Serrated	1/2" to 1 1/2"	2 5/8"	14 1/2"	6 1/2"	6 3/4"	24	Painted Steel	Bolt On	No	3	9/16"	Anvil	OSHA Compliant 29 CFR 1910.144	5333A22	000000	5333A25	00000
		6"	6"	Steel	Serrated	1/2" to 2"	3"	17"	6 3/4"	7 1/2"	33	Painted Steel	Bolt On	No	3	9/16"	Anvil	OSHA Compliant 29 CFR 1910.144	5333A23	000000	5333A26	00000
		8"	8"	Steel	Serrated	3/4" to 2 1/4"	3 1/2"	19 1/2"	8"	8"	49	Painted Steel	Bolt On	No	3	5/8"	Anvil	OSHA Compliant 29 CFR 1910.144	5333A38	000000	———	0
		10"	10"	Steel	Serrated	7/8" to 2 3/4"	4"	22 1/2"	10"	8 1/2"	56	Painted Steel	Bolt On	No	3	5/8"	Anvil	OSHA Compliant 29 CFR 1910.144	5333A41	000000	———	0

Pipe Flange Aligners with Protractor

Line up two pipe flanges and determine pipe angle with the included nut-and-bolt pins, level, and protractor. Flange holes align as you tighten the pins.

	Angle Measured Range	Graduations (Angle Increments)	For Distance Between Bolt Holes		Each
Aluminum



	3/16" to 1 3/4"	0° to 90°	2.5° (2°)	2" to 5 1/2"	2342A11	0000000

Magnetic Pipe Flange Aligner Pins

Swiftly and accurately align pipe flange bolt holes without the hassle of threads. These pins have strong magnets that snap together. Insert them into adjacent bolt holes to help make sure flanges are parallel before connecting pipes. Also known as two-hole pins.

For 2 3/4" Flange Thickness—Pins for 2 _3/4" thick flanges can be used with pipe flange aligner extensions (sold separately) to lengthen their reach for flanges up to 3 _1/2″ thick.

	Pipe Flange Aligners						Pipe Flange Aligner Extensions
	For Flange
	Hole Dia.	Thk.	Aligner Connection Method	Magnet Material		Pair	Lg.		Each
Steel



		5/16" to 7/8"	7/8"	Magnetic	Neodymium	7065N11	000000	—	———	0


		1/2" to 1 7/16"	1 3/8"	Magnetic	Neodymium	7065N12	000000	—	———	0
		3/4" to 1 15/16"	2 3/4"	Magnetic	Neodymium	7065N13	000000	1 3/4"	7065N14	000000