Miter Squares | McMaster-Carr

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Reversible

21 Products

Combination Squares

Replace your try square, miter square, depth gauge, marking gauge, 90° level, ruler, and scriber with one tool. Blades labeled with numeric increments that are less than 1" are quick-reading.

Blades with Square Head with Built-In Level, Center Head, Reversible Protractor Head with Built-In Level, and Scriber


	Inch/Metric

Square head checks 90° angles.

Protractor head measures angles.

Center head identifies the center on pipes, rods, and shafts.

Etched—Etched graduation marks are wear resistant.

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



		12"/300 mm	1 mm (10 mm), 1/32" (4/32")	1 mm (10 mm), 1/16" (1")	1"	3/32"	Steel	Silver	Black	Etched	4 1/4"	2007A8	000000

Starrett High-Accuracy Combination Squares

Replace your try square, miter square, depth gauge, height gauge, center-point finder, and level. The blade on these squares meets Fed. Spec. GGG-R-791H, which establishes uniform standards for accuracy, graduations, and size. Blades are labeled with numeric increments that are less than 1" for quick reading.

Blades with Square Head with Built-In Level, Center Head, Protractor Head, and Scriber


	Inch

Square head checks 90° angles.

Protractor head measures angles.

Center head identifies the center on pipes, rods, and shafts.

Etched—Etched graduation marks are wear resistant.

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



		12"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.0035" to 0.005"	1"	3/32"	Steel	Silver	Black	Etched	4 1/2"	2108A57	0000000


		24"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.0035" to 0.007"	1"	3/32"	Steel	Silver	Black	Etched	4 1/2"	2108A59	000000

Replacements for Squares

		Each
Replacement Case for Combination Squares with 12" Long Blade	4264N11	0000000
Replacement Lockbolt for Square, Center, and Protractor Heads	1955A83	0000

Blades with Square Head with Built-In Level, Center Head, Reversible Protractor Head, and Scriber


	Inch/Metric

Inch

Square head checks 90° angles.

Protractor head measures angles.

Center head identifies the center on pipes, rods, and shafts.

Hardened Steel Square Head—Hardened-steel square heads are more durable and last longer than cast iron square heads.

Satin Blade—Satin blade appearance is corrosion resistant and reduces glare.

Etched—Etched graduation marks are wear resistant.

					Blade					Graduation		Cast Iron Square Head			Hardened Steel Square Head
	Blade Lg.	Front Graduations (Numeric Graduations)	Back Graduations (Numeric Graduations)	Lg. Accuracy	Wd.	Thk.	Material	Appearance	Color	Color	Type	Head Lg.		Each	Head Lg.		Each
Inch



		12"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.0035" to 0.005"	1"	3/32"	Steel	—	Silver	Black	Etched	4 1/2"	2108A51	0000000	—	———	0


		12"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.0035" to 0.005"	1"	3/32"	Steel	Satin	Chrome, Silver	Black	Etched	—	———	0	3 5/8"	2107A51	0000000
		12"	1/32" (4/32"), 1/64" (8/64")	1/50" (1/10"), 1/100" (1/10")	-0.0035" to 0.005"	1"	3/32"	Steel	—	Silver	Black	Etched	4 1/2"	2108A54	000000	—	———	0
		12"	1/32" (4/32"), 1/64" (8/64")	1/50" (1/10"), 1/100" (1/10")	-0.0035" to 0.005"	1"	3/32"	Steel	Satin	Chrome, Silver	Black	Etched	—	———	0	3 5/8"	2107A54	000000
		24"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.0035" to 0.007"	1"	3/32"	Steel	—	Silver	Black	Etched	4 1/2"	2108A53	000000	—	———	0
		24"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.0035" to 0.007"	1"	3/32"	Steel	Satin	Chrome, Silver	Black	Etched	—	———	0	3 5/8"	2107A53	000000
		24"	1/32" (4/32"), 1/64" (8/64")	1/50" (1/10"), 1/100" (1/10")	-0.0035" to 0.007"	1"	3/32"	Steel	Satin	Chrome, Silver	Black	Etched	—	———	0	3 5/8"	2107A56	000000


		Inch/Metric



				11 3/4"/300 mm	0.5 mm (10 mm), 1/32" (4/32")	1 mm (10 mm), 1/64" (8/64")	-0.0035" to 0.005"/ -0.09 mm to 0.15 mm	1"	3/32"	Steel	—	Silver	Black	Etched	4 1/2"	2108A55	000000	—	———	0


				11 3/4"/300 mm	0.5 mm (10 mm), 1/32" (4/32")	1 mm (10 mm), 1/64" (8/64")	-0.0035" to 0.005"/ -0.09 mm to 0.15 mm	1"	3/32"	Steel	Satin	Chrome, Silver	Black	Etched	—	———	0	3 5/8"	2107A57	000000

Replacements for Squares

		Each
Replacement Case for Combination Squares with 12" Long Blade	4264N11	0000000
Replacement Lockbolt for Square, Center, and Protractor Heads	1955A83	0000

Starrett High-Accuracy Combination Square Heads

Attach to Starrett High-Accuracy Combination Square Blades with the included lockbolts.

Protractor Heads

Protractor heads measure angles.

Cast Iron—Cast iron heads are durable, so they resist dents and scratches. However, they corrode more easily than zinc alloy heads.

			Protractor		Cast Iron
For Blade Lg.	Reversible	Features	Angle Measured Range	Graduations (Numeric Increments)		Each
12" to 48"	No	Built-In Level	0° to 180°	1° (10°)	1955A29	0000000
12" to 48"	Yes	Built-In Level	0° to 180°	1° (10°)	1955A25	000000

Replacement Square Head Lockbolts

For Head Style	For Blade Lg.		Each
Center, Square, Protractor	12" to 36"/300 mm to 600 mm	1955A83	00000

High-Accuracy Combination Squares

Use these squares in place of your try square, miter square, depth gauge, height gauge, center-point finder, and level. Blades are labeled with numeric increments that are less than 1" for quick reading.

Blades with Square Head with Built-In Level, Center Head, Reversible Protractor Head, and Scriber


	Inch

Square head checks 90° angles.

Protractor head measures angles.

Center head identifies the center on pipes, rods, and shafts.

Hardened Cast Iron Square Head—Hardened cast iron square heads are more durable and last longer than cast iron square heads.

Satin Blade—Satin blade appearance is corrosion resistant and reduces glare.

Etched—Etched graduation marks are wear resistant.

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



		12"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.0025" to 0.0025"	1"	3/32"	Steel	Satin	Chrome, Silver	Black	Etched	4 1/2"	21115A11	0000000	21115A15	0000000

Replacement Square Head Lockbolts

		Each
Replacement Lockbolt	21115A36	00000

High-Accuracy Combination Square Heads

Attach to High-Accuracy Combination Square Blades with the included lockbolts.

Protractor Heads

Protractor heads measure angles.

Cast Iron—Cast iron heads are durable, so they resist dents and scratches. However, they corrode more easily than zinc alloy heads.

	Combination Square Protractor Heads						Replacement Square Head Lockbolts
			Protractor
	For Blade Lg.	Reversible	Angle Measured Range	Graduations (Numeric Increments)		Each		Each
Cast Iron



		12" to 24"	Yes	0° to 180°	1° (10°)	21115A32	000000	21115A36	00000

Scratch-Resistant High-Accuracy Combination Squares

A titanium coating protects the blade against scratches and wear. Use these squares to replace your try square, miter square, depth gauge, height gauge, center-point finder, and level. Blades are labeled with numeric increments that are less than 1" for quick reading.

Blades with Square Head with Built-In Level, Center Head, Protractor Head, and Scriber


	Inch

Square head checks 90° angles.

Protractor head measures angles.

Center head identifies the center on pipes, rods, and shafts.

Etched—Etched graduation marks are wear resistant.

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



		12"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.002" to 0.002"	1"	3/32"	Titanium-Coated Steel	Gold	Black	Etched	4 1/2"	21155A36	0000000