Welding Squares | McMaster-Carr

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72 Products

Welding Fixture Squares


2 Axes	2 Axes With Leveling Tabs	2 Axes with Joint Access Cutouts and Leveling Tabs

2 Axes with Locator Holes	3 Axes

Position your workpieces at the correct angle prior to welding. These squares have an extra-wide head, so you can clamp them in place.

Joint Access Cutouts—Squares with joint access cutouts make it easier to reach joints, such as when welding and gluing.

Locator Holes—Those with locator holes help you align your workpiece on a welding grid. They have _5/8" locating holes on 2" centers to fit into standard fixture table configurations.

Leveling Tabs—Leveling tabs are for aligning workpieces with one another.

Aluminum—Aluminum squares are lightweight and corrosion resistant.

Cast Iron—Cast iron squares are durable and difficult to dent or scratch. They resist weld spatter, but they’re more likely to corrode than aluminum.

Black-Oxide Steel—Black-oxide steel squares are stronger than aluminum and more corrosion resistant than cast iron.

		Overall				Locator Hole		Aluminum		Cast Iron		Black-Oxide Steel
	Holding Angle	Lg.	Wd.	Ht.	Flange Thk.	Dia.	Ctr-to-Ctr.		Each		Each		Each
2 Axes



		90°	4"	4"	2 1/2"	3/8"	—	—	———	0	———	0	4984N102	000000


		2 Axes with Leveling Tabs



				45°, 90°	4"	4"	1 1/2"	1/4"	—	—	4984N32	000000	4984N42	000000	———	0


				45°, 90°	6"	6"	1 1/2"	1/4"	—	—	4984N33	00000	4984N43	00000	———	0
				45°, 90°	12"	12"	3"	1/4"	—	—	4984N36	000000	4984N46	000000	———	0


				2 Axes with Joint Access Cutouts and Leveling Tabs



						45°, 90°	4"	4"	1 1/2"	1/4"	—	—	4984N12	00000	4984N22	00000	———	0


						45°, 90°	6"	6"	1 1/2"	1/4"	—	—	4984N13	00000	4984N23	00000	———	0
						45°, 90°	12"	12"	3"	3/8"	—	—	4984N16	000000	4984N26	000000	———	0


						2 Axes with Locator Holes



								90°	12"	8"	2 1/2"	3/8"	5/8"	2"	———	0	———	0	4984N103	00000


								90°	12"	12"	2 1/2"	3/8"	5/8"	2"	———	0	———	0	4984N104	000000


								3 Axes



										90°	10 1/2"	10 1/2"	8"	1"	—	—	———	0	4984N101	000000	———	0

Magnetic Clamps


Style A	Style B	Style C

Style D	Style E

Hold magnetic workpieces in place.

Style E—Style E clamps have a handle to help pull them off surfaces.

Copper-Plated Steel Body—Copper-plated steel clamps won’t scratch steel surfaces. Their plating also stops weld spatter from sticking to their surface, so sharp spatter won’t cut you or your workpiece.

			Overall
Style	Max. Magnetic Pull, lbf	Holding Angle	Lg.	Wd.	Ht.	Body Material		Each
A	41	45°, 90°	4 3/4"	9/16"	3 1/4"	Steel	5167A101	00000
B	22	30°, 45°, 60°, 75°, 90°	4"	1/2"	2 1/2"	Steel	5167A25	00000
B	55	30°, 45°, 60°, 75°, 90°	4 3/8"	3/4"	3"	Steel	5167A26	00000
B	110	30°, 45°, 60°, 75°, 90°	4 3/8"	1 9/16"	3"	Steel	5167A27	00000
C	60	45°, 90°	3 3/4"	3/4"	3 3/4"	Copper-Plated Steel	5167A311	00000
C	75	45°, 90°	3 3/4"	3/4"	4 3/8"	Copper-Plated Steel	5167A313	00000
C	112	45°, 90°, 135°	3 3/4"	3/4"	4 3/8"	Steel	5021A86	00000
D	60	30°, 45°, 60°, 90°	3 3/4"	3/4"	3 3/4"	Copper-Plated Steel	5167A312	00000
E	150	45°, 90°	3 3/4"	1 1/2"	4 3/8"	Steel	5167A102	00000
E	325	45°, 90°	8"	1 1/2"	8"	Steel	5167A28	000000

Fixture Squares


Style A	Style B	Style C

Style D	Style E	Style F (Left Orientation)

Style F (Right Orientation)

Build fixtures on multiple sides of these squares—you can use them individually or stack them. Made from iron or steel, they’re strong and stable for accurate fixturing. They hold up to welding, fabrication, and other demanding applications.

						Slots				Holes					Tolerance
Style	Lg.	Wd.	Ht.	Plate Thk.	Orientation	No. of	Shape	Lg.	Wd.	No. of	Dia.	Ctr.-to-Ctr. (A)	Ctr.-to-Ctr. (B)	Wt., lb.	Squareness per 4"	Parallel	Material		Each



	A	2"	2"	10"	1/2"	—	—	—	—	—	20	5/8"	1"	—	5	0.001"	0.002"	Nitride-Coated Steel	1392N11	0000000


	B	3 3/4"	4"	3 3/4"	1/2"	—	4 1	Straight Curved	2" 2 13/16"	5/8" 5/8"	6	5/8"	2"	—	5	Not Rated	Not Rated	Iron	1392N111	000000
	C	4"	4"	4"	1/2"	—	2	Straight	2 3/16"	5/8"	21	5/8"	2"	1 7/16"	8	0.001"	0.002"	Nitride-Coated Steel	1392N12	000000
	C	4"	4"	8"	1/2"	—	2	Straight	2"	5/8"	39	5/8"	2"	1 7/16"	13	0.001"	0.002"	Nitride-Coated Steel	1392N13	000000
	C	4"	4"	12"	1/2"	—	2	Straight	2"	5/8"	57	5/8"	2"	1 7/16"	18	0.001"	0.002"	Nitride-Coated Steel	1392N14	000000
	D	4"	8"	24"	1/2"	—	2 4 2	Straight Straight Straight	4" 2" 4"	5/8" 5/8" 5/8"	157	5/8"	2"	2"	53	Not Rated	Not Rated	Nitride-Coated Steel	1392N112	00000000
	D	4"	8"	36"	1/2"	—	2 4 2	Straight Straight Straight	4" 2" 4"	5/8" 5/8" 5/8"	235	5/8"	2"	2"	77	Not Rated	Not Rated	Nitride-Coated Steel	1392N113	00000000
	E	6"	2"	12"	1/2"	—	2	Straight	4"	5/8"	26	5/8"	1"	1"	7	0.002"	0.006"	Iron	1392N15	000000
	F	8"	2"	20"	1/2"	Left-Hand Side	4 2 1	Straight Curved Curved	2" 2 13/16" 5 5/8"	5/8" 5/8" 5/8"	43	5/8"	1"	1"	15	Not Rated	Not Rated	Iron	1392N115	000000
	F	8"	2"	20"	1/2"	Right-Hand Side	4 2 1	Straight Curved Curved	2" 2 13/16" 5 5/8"	5/8" 5/8" 5/8"	43	5/8"	1"	1"	15	Not Rated	Not Rated	Iron	1392N114	000000

Easy On/Off Magnetic Clamps


Style A	Style B	Style C

Style D	Style E

Switch the magnets on these clamps on and off for easy placement and removal of your workpiece.

Style E—Style E have magnets on opposite sides that can be turned on and off independently, letting you adjust one workpiece while the other remains clamped in place. They’re commonly used to weld two pieces of metal together.

			Overall
	Max. Magnetic Pull, lbf	Holding Angle	Lg.	Wd.	Ht.	Body Material	Features		Each
Style A



		65	45°, 90°	4 3/8"	1"	3 3/4"	Steel	—	5021A41	000000


		75	45°, 90°	6"	1 1/4"	5 1/8"	Steel	—	5021A43	00000
		90	45°, 90°	4 3/8"	1 1/8"	3 3/4"	Steel	—	5021A42	00000
		160	45°, 90°	6"	1 3/8"	5 1/8"	Steel	—	5021A44	00000


		Style B



				140	30°, 45°, 60°, 90°	6"	1 3/8"	5 1/8"	Steel	—	5021A36	00000


				Style C



						75	45°, 60°, 75°, 90°, 105°, 120°, 135°	2 7/8"	1 1/4"	2 9/16"	Steel	—	5021A32	00000


						Style D



								150	90°	1 5/8"	1 9/16"	2 3/4"	Steel	—	5021A11	00000


								400	90°	2 1/2"	1 5/8"	3 9/16"	Steel	—	5021A31	000000
								600	90°	3"	2"	4 1/8"	Steel	—	5021A33	000000
								1,000	90°	4 1/4"	4"	4 3/4"	Steel	—	5021A13	000000


								Style E



										120	90°	6"	1 1/2"	6"	Aluminum	Two On/Off Switches	5021A34	000000


										260	90°	7 3/4"	1 7/8"	7 3/4"	Aluminum	Two On/Off Switches	5021A35	000000

Heavy Duty Combination Squares

Built for welding and other heavy duty fabricating jobs, these squares have an extra-wide head and a large thumbwheel, so they’re easy to adjust and hold while wearing gloves. They combine the functionality of a try square, miter square, depth gauge, marking gauge, 90° level, and ruler in one tool. Add a clamp to the extra-wide head or use the included leveling tabs to hold material while welding. The tabs can also be used to set workpieces level to one another before fabricating. The fully recessed blade makes it easy to measure around obstacles.

Blades with Square Head with Built-In Level and Leveling Tabs


	Inch

Square head checks 90° angles.

Cast Iron Square Head—Squares with a cast iron head are durable and resist both scratches and dents. However, they’re more prone to corrosion than squares with zinc alloy heads.

Aluminum Square Head—Squares with an aluminum head are lightweight and resist corrosion.

Etched—Etched graduation marks are wear resistant.

				Blade				Graduation				Cast Iron Square Head		Aluminum Square Head
	Blade Lg.	Front Graduations (Numeric Graduations)	Back Graduations (Numeric Graduations)	Wd.	Thk.	Material	Color	Color	Type	Flange Thk.	Head Lg.		Each		Each
Inch



		12"	1/8" (1"), 1/16" (1")	1/8" (1"), 1/16" (1")	1"	7/64"	Stainless Steel	Gold	Black	Etched	2"	5"	4998N12	0000000	4998N11	0000000

Miniature Adjustable-Angle Magnetic Clamps

Sized for small parts and tight spaces, these clamps have a pivoting pad at each end to hold workpieces at any angle up to 180°.

Sold Individually


Two Individual Clamps Shown

	Overall
Max. Magnetic Pull, lbf	Lg.	Wd.	Ht.	Holding Angle		Each
14	2 1/4"	1"	1"	0° to 180°	2497N12	00000
18	2 1/2"	1 1/2"	1 1/4"	0° to 180°	2497N13	00000

Sold as Sets


Two Individual Clamps Shown

No. of Pieces	Includes	Holding Angle		Each
4	Two 2 1/4" Lg. × 1" Wd. Clamps with 14 lbs. Max. Magnetic Pull Two 2 1/2" Lg. × 1 1/2" Wd. Clamps with 18 lbs. Max. Magnetic Pull	0° to 180°	2497N11	000000

Outside-Clamping Magnetic Clamps

Clamp workpieces from the outside at a 90° angle, leaving the inside free for welding or fabrication. You can also clamp on the inside at 45° and 90°.

	Holding Angle		Overall
Max. Magnetic Pull, lbf	Outside	Inside	Lg.	Wd.	Ht.	Body Material		Each
40	90°	45°, 90°	3 7/8"	11/16"	3 7/8"	Steel	6022N21	000000

Pipefitting Squares

Square with Optional Square Holder

Pipe fitting sizes and welding charts are shown on this square in wear-resistant etched graduations.

						Blade			Graduation
	Angle Measured	Blade Lg.	For Pipe Size	Front Graduations (Numeric Graduations)	Back Graduations (Numeric Graduations)	Wd.	Thk.	Color	Color	Type	Measuring Features		Each
Inch







				Stainless Steel

				90°	24" × 15 3/8"	1, 1 1/2, 2, 2 1/2, 3, 4, 6, 8, 10, 12, 14, 16, 18, 20, 24	1/16" (1"), 1/16" (1")	1/12" (1"), 1/12" (1")	2 3/16" × 1 9/16"	1/16" × 1/16"	Silver	Black	Etched	Bolt Chart, Chart for 150-Lb. Weld Neck Flanges, Chart for 300-Lb. Weld Neck Flanges, Chart for 45° Weld Elbows, Chart for Diameter of 150-Lb. Pipe Blinds, Chart for Diameter of 300-Lb. Pipe Blinds, Chart for OD of 150-Lb. Flanges, Chart for OD of 300-Lb. Flanges, Chart for Weld Tees	1946A25	0000000

Square Holders

	For Min. Pipe Dia.	Max. Magnetic Pull, lbf	No. of Magnets	Lg.	Wd.	Ht.
Aluminum


1"	25	2	8 1/4"	2 1/4"	7 1/2"	8990A61	0000000

Adjustable-Angle Magnetic Clamps

Two clamps connected by a pivoting arm hold workpieces at nearly any angle.

		Overall
Max. Magnetic Pull, lbf	Holding Angle	Lg.	Wd.	Ht.	Body Material		Each
120	15° to 180°	7 5/8"	3/4"	3 3/4"	Steel	2411N11	000000

Easy On/Off Adjustable-Angle Magnetic Clamps

Each arm has a handle for turning the magnets on and off. Adjust these clamps to hold at any angle from 28° to 270° and lock the arms in place at the joint.

		Arm
Max. Magnetic Pull, lbf	Holding Angle	Lg.	Wd.	Ht.	Overall Lg.	Body Material	Features		Each
200	28° to 270°	9 1/4"	1 11/16"	1 1/2"	15 3/4"	Steel	Magnet On/Off Knobs	1395N11	0000000

Three-Axis Magnetic Clamps


	55 lbf Maximum Magnetic Pull	75 lbf Maximum Magnetic Pull

Hold and align up to three workpieces at 90° angles. Three magnetic faces clamp parts along multiple planes simultaneously, so you can tack-weld corners and T-joints without repositioning or using separate fixtures.

		Overall
Max. Magnetic Pull, lbf	Holding Angle	Lg.	Wd.	Ht.	Body Material		Each
55	30°, 45°, 60°, 75°, 90°	3"	4 3/8"	1 1/8"	Steel	2393N1	000000
75	45°, 90°	4 3/8"	3 3/4"	1 1/8"	Steel	2393N2	00000

Fixture Columns

Clamp multiple parts or fixtures to these columns to speed up your machining process. Also known as tombstones, they have multiple faces for building dense, efficient setups. Each face is precision-machined for accurate positioning. Made from cast iron, these columns are rigid enough to limit vibration and stabilize your workpieces during machining.

Blank


Square	Rectangle	Cross

Blank columns can be customized to fit your application. Machine them with your own holes, T-slots, or other mounting surfaces.

Square—Square columns have four equal faces for balanced machining on each side.

Rectangle—Rectangle columns have two wide faces for larger setups and two narrow faces for smaller ones. The narrow faces can also help reduce tool interference.

Cross—Cross columns have four equal faces, similar to square columns, but cutouts at each corner give you more tool clearance.

	Column				Base			Mounting Holes					Tolerance
	Lg.	Wd.	Ht.	Overall Ht.	Lg.	Wd.	Thk.	No. of	Style	Ctr.-to-Ctr.	For Mounting Screw Size	Wt., lb.	Squareness	Parallel	Flatness	Material		Each
Square



		8"	8"	22"	22 1/2"	15 3/4"	15 3/4"	1 1/2"	8	Slotted	6"	5/8"	365	0.0008"	0.0005"	0.0005"	Cast Iron	9990N111	000000000


		10"	10"	26"	28"	19 3/4"	19 3/4"	2"	8	Slotted	8"	5/8"	615	0.0008"	0.0005"	0.0005"	Cast Iron	9990N113	00000000


		Rectangle



				15 3/4"	4"	26"	28"	15 3/4"	15 3/4"	2"	6	Slotted	6"	5/8"	540	0.0008"	0.0005"	0.0005"	Cast Iron	9990N115	00000000


				19 3/4"	4"	26"	28"	19 3/4"	19 3/4"	2"	6	Slotted	8"	5/8"	715	0.0008"	0.0005"	0.0005"	Cast Iron	9990N117	00000000


				Cross



						10"	10"	26 1/2"	28"	15 3/4"	15 3/4"	1 1/2"	8	Slotted	6"	5/8"	545	0.0008"	0.0005"	0.0005"	Cast Iron	9990N119	00000000

Grid


Square	Rectangle	Cross

Grid columns have industry-standard hole patterns. The holes are lined with a precision bushing and a threaded insert to help locate fasteners, so you can clamp parts accurately and securely. Both are hardened to resist wear. These columns also come with a plastic chip plug for each hole—plug unused holes to keep debris from clogging them or causing damage.

Square—Square columns have four equal faces for balanced machining on each side.

Rectangle—Rectangle columns have two wide faces for larger setups and two narrow faces for smaller ones. The narrow faces can also help reduce tool interference.

Cross—Cross columns have four equal faces, similar to square columns, but cutouts at each corner give you more tool clearance.

	Columns																					Aluminum Chip Plugs		Replacement Plastic Chip Plugs
	Column				Base			Holes			Mounting Holes					Tolerance
	Lg.	Wd.	Ht.	Overall Ht.	Lg.	Wd.	Thk.	No. of	Thread Size	Ctr.-to-Ctr.	No. of	Style	Ctr.-to-Ctr.	For Mounting Screw Size	Wt., lb.	Squareness	Parallel	Flatness	Material		Each		Each		Each
Square



		8"	8"	22"	22 1/2"	15 3/4"	15 3/4"	1 1/2"	132	1/2"-13	2"	8	Slotted	6"	5/8"	355	0.0008"	0.0005"	0.0005"	Cast Iron	9990N112	000000000	3161N12	00000	3161N13	00000


		10"	10"	26"	28"	19 3/4"	19 3/4"	2"	208	1/2"-13	2"	8	Slotted	8"	5/8"	600	0.0008"	0.0005"	0.0005"	Cast Iron	9990N114	00000000	3161N12	0000	3161N13	0000


		Rectangle



				15 3/4"	4"	26"	28"	15 3/4"	15 3/4"	2"	208	1/2"-13	2"	6	Slotted	6"	5/8"	525	0.0008"	0.0005"	0.0005"	Cast Iron	9990N116	00000000	3161N12	0000	3161N13	0000


				19 3/4"	4"	26"	28"	19 3/4"	19 3/4"	2"	260	1/2"-13	2"	6	Slotted	8"	5/8"	695	0.0008"	0.0005"	0.0005"	Cast Iron	9990N118	00000000	3161N12	0000	3161N13	0000


				Cross



						10"	10"	26 1/2"	28"	15 3/4"	15 3/4"	1 1/2"	156	1/2"-13	2"	8	Slotted	6"	5/8"	535	0.0008"	0.0005"	0.0005"	Cast Iron	9990N121	00000000	3161N12	0000	3161N13	0000