Combination Squares

Filter by

Blade Length

Square Head Material

System of Measurement

Length

Blade Material

Measuring Component

Square Head with Built-In Level

Head Length

Material

Graduations

Manufacturer

Numeric Graduations

Blade Width

Blade Color

Manufacturer Model Number

Center Head Material

Width

Protractor Head Material

REACH

Blade Thickness

Performance

DFARS Specialty Metals

Exempt

Export Control Classification Number (ECCN)

EAR99

RoHS

Compliant

Compliant with Exemptions

Graduation Location

Thickness

Blade Finished Material

Stainless Steel

Steel

Titanium-Coated Steel

Forward

How can we improve?

114 Products

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


	Inch/Metric

Square head checks 90° angles.

Etched—Etched graduation marks are wear resistant.

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



		12"/304 mm	1/32" (8/32"), 1 mm (10 mm)	1 mm (10 mm), 1/16" (1")	1"	3/32"	Stainless Steel	Silver	Black	Etched	4 9/16"	2007A7	00000

Blades with Square Head with Built-In Level and Scriber


	Inch/Metric

Inch	Metric

Square head checks 90° angles.

Etched—Etched graduation marks are wear resistant.

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



		6"	1/16" (1"), 1/32" (1")	1/8" (1"), 1/16" (1")	13/16"	5/64"	Stainless Steel	Silver	Black	Etched	3 11/16"	2007A5	000000
		12"	1/16" (1"), 1/32" (1")	1/8" (1"), 1/16" (1")	1"	3/32"	Stainless Steel	Silver	Black	Etched	4 5/8"	2007A9	00000
		16"	1/16" (1"), 1/32" (1")	1/8" (1"), 1/16" (1")	1"	3/32"	Stainless Steel	Silver	Black	Etched	4 5/8"	2007A6	00000


		Inch/Metric



				12"/300 mm	1/32" (8/32"), 1 mm (10 mm)	1 mm (10 mm), 1/16" (1")	1"	3/32"	Stainless Steel	Silver	Black	Etched	4 5/8"	2007A111	00000
				16"/400 mm	1/32" (8/32"), 1 mm (10 mm)	1 mm (10 mm), 1/16" (1")	1"	3/32"	Stainless Steel	Silver	Black	Etched	4 3/4"	2007A113	00000
				6"/150 mm	1/32" (8/32"), 1 mm (10 mm)	1 mm (10 mm), 1/16" (1")	13/16"	5/64"	Stainless Steel	Silver	Black	Etched	3 11/16"	2007A112	00000


				Metric



						150 mm	1 mm (10 mm), 1 mm (10 mm)	1 mm (10 mm), 1 mm (10 mm)	13/16"	5/64"	Stainless Steel	Silver	Black	Etched	3 11/16"	2007A31	00000
						300 mm	1 mm (10 mm), 1 mm (10 mm)	1 mm (10 mm), 1 mm (10 mm)	1"	3/32"	Stainless Steel	Silver	Black	Etched	4 5/8"	2007A41	00000
						400 mm	1 mm (10 mm), 1 mm (10 mm)	1 mm (10 mm), 1 mm (10 mm)	1"	3/32"	Stainless Steel	Silver	Black	Etched	4 5/8"	2007A51	00000

Blades with Square Head, Angle Finder, and Scriber


	Inch/Metric

Square head checks 90° angles.

Angle finder measures any angle from 0° to 90° and has a chart to convert angle to pitch.

Etched—Etched graduation marks are wear resistant.

					Blade				Graduation		Zinc Square Head
	Blade Lg.	Angle Finder Angle Measured Range	Front Graduations (Numeric Graduations)	Back Graduations (Numeric Graduations)	Wd.	Thk.	Material	Color	Color	Type	Head Lg.		Each
Inch/Metric



		12"/300 mm	0° to 90°	1 mm (10 mm), 1/32" (4/32")	1 mm (10 mm), 1/16" (1")	1"	5/64"	Steel	Silver	Black	Etched	4"	2004A11	000000

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


	Inch

Square head checks 90° angles.

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		Each
Inch



		4"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.002" to 0.004"	5/8"	1/16"	Steel	Satin	Chrome, Silver	Black	Etched	2 1/4"	2108A21	0000000	2107A21	0000000

Replacement Square Head Lockbolts

		Each
Replacement Lockbolt for Square and Center Heads	1955A81	000000

Blades with Square Head and Center Head


	Inch

Square head checks 90° angles.

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

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

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	Appearance	Color	Color	Type	Head Lg.		Each
Inch



		4"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.002" to 0.004"	5/8"	1/16"	Steel	Satin	Chrome, Silver	Black	Etched	2 1/4"	2108A11	0000000

Replacement Square Head Lockbolts

		Each
Replacement Lockbolt for Square and Center Heads	1955A81	000000

Blades with Square Head with Built-In Level and Scriber


	Inch/Metric

Inch

Square head checks 90° angles.

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



		6"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.002" to 0.004"	3/4"	5/64"	Steel	—	Silver	Black	Etched	2 13/32"	2108A44	0000000	—	———	0
		6"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.002" to 0.004"	3/4"	5/64"	Steel	Satin	Chrome, Silver	Black	Etched	2 13/32"	2108A22	000000	2 13/32"	2107A22	0000000
		6"	1/32" (4/32"), 1/64" (8/64")	1/50" (1/10"), 1/100" (1/10")	-0.002" to 0.004"	3/4"	5/64"	Steel	Satin	Chrome, Silver	Black	Etched	2 13/32"	2108A28	000000	2 13/32"	2107A28	000000
		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"	2108A45	000000	—	———	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	4 1/2"	2108A23	000000	3 5/8"	2107A23	000000
		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	4 1/2"	2108A29	000000	3 5/8"	2107A29	000000
		18"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.0035" to 0.006"	1"	3/32"	Steel	Satin	Chrome, Silver	Black	Etched	4 1/2"	2108A24	000000	3 5/8"	2107A24	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	Satin	Chrome, Silver	Black	Etched	4 1/2"	2108A25	000000	3 5/8"	2107A25	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"	2107A32	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	Satin	Chrome, Silver	Black	Etched	4 1/2"	2108A26	000000	3 5/8"	2107A26	000000
				23 1/2"/600 mm	0.5 mm (10 mm), 1/32" (4/32")	1 mm (10 mm), 1/64" (8/64")	-0.0035" to 0.007"/ -0.11 mm to 0.25 mm	1"	3/32"	Steel	Satin	Chrome, Silver	Black	Etched	4 1/2"	2108A27	000000	3 5/8"	2107A27	000000

Replacements for Squares

		Each
Replacement Case for Combination Squares with 12" Long Blade	4264N11	000000
Replacement Lockbolt for Square and Center Heads	1955A82	00000
Replacement Lockbolt for Square, Center, and Protractor Heads	1955A83	0000

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


	Inch

Square head checks 90° 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



		6"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.002" to 0.004"	3/4"	5/64"	Steel	Satin	Chrome, Silver	Black	Etched	—	———	0	2 13/32"	2107A12	0000000
		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	4 1/2"	2108A13	0000000	3 5/8"	2107A13	000000

Replacements for Squares

		Each
Replacement Case for Combination Squares with 12" Long Blade	4264N11	000000
Replacement Lockbolt for Center Heads	1955A85	00000
Replacement Lockbolt for Square and Center Heads	1955A82	00000
Replacement Lockbolt for Square, Center, and Protractor Heads	1955A83	0000

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
		18"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.0035" to 0.006"	1"	3/32"	Steel	Silver	Black	Etched	4 1/2"	2108A58	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"	2108A59	000000

Replacements for Squares

		Each
Replacement Case for Combination Squares with 12" Long Blade	4264N11	000000
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
		18"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.0035" to 0.006"	1"	3/32"	Steel	—	Silver	Black	Etched	4 1/2"	2108A52	000000	—	———	0
		18"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.0035" to 0.006"	1"	3/32"	Steel	Satin	Chrome, Silver	Black	Etched	—	———	0	3 5/8"	2107A52	000000
		18"	1/32" (4/32"), 1/64" (8/64")	1/50" (1/10"), 1/100" (1/10")	-0.0035" to 0.006"	1"	3/32"	Steel	Satin	Chrome, Silver	Black	Etched	—	———	0	3 5/8"	2107A55	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
				23 1/2"/600 mm	0.5 mm (10 mm), 1/32" (4/32")	1 mm (10 mm), 1/64" (8/64")	-0.0035" to 0.007"/ -0.11 mm to 0.25 mm	1"	3/32"	Steel	—	Silver	Black	Etched	4 1/2"	2108A56	000000	—	———	0
				23 1/2"/600 mm	0.5 mm (10 mm), 1/32" (4/32")	1 mm (10 mm), 1/64" (8/64")	-0.0035" to 0.007"/ -0.11 mm to 0.25 mm	1"	3/32"	Steel	Satin	Chrome, Silver	Black	Etched	—	———	0	3 5/8"	2107A58	000000

Replacements for Squares

		Each
Replacement Case for Combination Squares with 12" Long Blade	4264N11	000000
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.

Square Heads

Square heads check 90° angles.

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

Hardened Steel—Hardened steel heads are more durable and last longer than cast iron heads.

		Cast Iron		Hardened Steel
For Blade Lg.	Features		Each		Each
4"	—	1955A11	000000	1955A14	000000
6"	Built-In Level	1955A12	00000	1955A15	00000
12" to 48"	Built-In Level	1955A13	00000	1955A16	000000

Replacement Square Head Lockbolts

For Head Style	For Blade Lg.		Each
Center, Square	4"	1955A81	000000
Center, Square	6"	1955A82	00000
Center, Square, Protractor	12" to 36"/300 mm to 600 mm	1955A83	0000

Center Heads

Center heads identify the center on pipes, rods, and shafts.

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

Hardened Steel—Hardened steel heads are more durable and last longer than cast iron heads.

	Cast Iron		Hardened Steel
For Blade Lg.		Each		Each
4"	1955A17	000000	1955A21	000000
6"	1955A18	00000	1955A22	000000
12" to 48"	1955A19	00000	1955A23	000000

Replacement Square Head Lockbolts

For Head Style	For Blade Lg.		Each
Center, Square	4"	1955A81	000000
Center, Square	6"	1955A82	00000
Center	6"	1955A85	00000
Center, Square, Protractor	12" to 36"/300 mm to 600 mm	1955A83	0000

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 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

Starrett High-Accuracy Combination Square Blades


Inch	Inch/Metric

Use these blades with Starrett High-Accuracy Combination Square Heads. They meet Fed. Spec. GGG-R-791, which establishes uniform standards for accuracy, graduations, and size. Blades are labeled with numeric increments that are less than 1" for quick reading. All have a corrosion-resistant satin chrome-plated finish that reduces glare and wear-resistant etched markings.

								Graduation
	Lg.	Front Graduations (Numeric Graduations)	Back Graduations (Numeric Graduations)	Lg. Accuracy	Wd.	Thk.	Color	Color	Type		Each
Inch





				Satin Chrome-Plated Steel

				4"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.002" to 0.004"	5/8"	1/16"	Silver	Black	Etched	1955A32	000000
				6"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.002" to 0.004"	3/4"	5/64"	Silver	Black	Etched	1955A34	00000
				6"	1/32" (4/32"), 1/64" (8/64")	1/50" (1/10"), 1/100" (1/10")	-0.002" to 0.004"	3/4"	5/64"	Silver	Black	Etched	1955A35	00000
				12"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.0035" to 0.005"	1"	3/32"	Silver	Black	Etched	1955A36	00000
				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"	Silver	Black	Etched	1955A37	000000
				24"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.0035" to 0.007"	1"	3/32"	Silver	Black	Etched	1955A41	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"	Silver	Black	Etched	1955A42	000000
				36"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.0035" to 0.007"	1"	3/32"	Silver	Black	Etched	1955A51	000000


				Inch/Metric





								Satin Chrome-Plated Steel

								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"	Silver	Black	Etched	1955A44	000000
								23 1/2"/600 mm	0.5 mm (10 mm), 1/32" (4/32")	1 mm (10 mm), 1/64" (8/64")	-0.0035" to 0.007"/-0.11 mm to 0.25 mm	1"	3/32"	Silver	Black	Etched	1955A45	000000

High-Accuracy Combination Square Heads

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

Square Heads

Square heads check 90° angles.

Zinc—Zinc heads are lightweight and corrosion resistant.

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

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

	Combination Square Heads				Replacement Square Head Lockbolts
	For Blade Lg.	Features		Each		Each
Zinc



		12" to 24"	Built-In Level	21115A51	00000	21115A101	00000


		Cast Iron



				12" to 24"	Built-In Level	21115A27	00000	21115A36	0000


				Hardened Cast Iron



						12" to 24"	Built-In Level	21115A28	00000	21115A36	0000

Center Heads

Center heads identify the center on pipes, rods, and shafts.

Zinc—Zinc heads are lightweight and corrosion resistant.

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

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

	Combination Square Center Heads			Replacement Square Head Lockbolts
	For Blade Lg.		Each		Each
Zinc



		12" to 24"	21115A52	00000	21115A101	00000


		Cast Iron



				12" to 24"	21115A29	00000	21115A36	0000


				Hardened Cast Iron



						12" to 24"	21115A31	00000	21115A36	0000

Protractor Heads

Protractor heads measure angles.

Zinc—Zinc heads are lightweight and corrosion resistant.

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

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



		12" to 24"	Yes	0° to 180°	1° (10°)	21115A53	000000	21115A101	00000


		Cast Iron



				12" to 24"	Yes	0° to 180°	1° (10°)	21115A32	00000	21115A36	0000

High-Accuracy Combination Square Blades

Blades are for use with High-Accuracy Combination Square Heads. Blades are labeled with numeric increments that are less than 1" for quick-reading. All have a corrosion-resistant satin chrome-plated finish that reduces glare and wear-resistant etched markings.

								Graduation
	Lg.	Front Graduations (Numeric Graduations)	Back Graduations (Numeric Graduations)	Lg. Accuracy	Wd.	Thk.	Color	Color	Type		Each
Inch





				Satin Chrome-Plated Steel

				6"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.0025" to 0.0025"	3/4"	5/64"	Silver	Black	Etched	21115A41	000000
				6"	1/32" (4/32"), 1/64" (8/64")	1/50" (1/10"), 1/100" (1/10")	-0.0025" to 0.0025"	3/4"	5/64"	Silver	Black	Etched	21115A42	00000
				12"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.0025" to 0.0025"	1"	3/32"	Silver	Black	Etched	21115A21	00000
				12"	1/32" (4/32"), 1/64" (8/64")	1/50" (1/10"), 1/100" (1/10")	-0.0025" to 0.0025"	1"	3/32"	Silver	Black	Etched	21115A22	00000
				18"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.0025" to 0.0025"	1"	3/32"	Silver	Black	Etched	21115A23	00000
				18"	1/32" (4/32"), 1/64" (8/64")	1/50" (1/10"), 1/100" (1/10")	-0.0025" to 0.0025"	1"	3/32"	Silver	Black	Etched	21115A24	00000
				24"	1/32" (4/32"), 1/64" (8/64")	1/8" (1"), 1/16" (1")	-0.0025" to 0.0025"	1"	3/32"	Silver	Black	Etched	21115A25	000000
				24"	1/32" (4/32"), 1/64" (8/64")	1/50" (1/10"), 1/100" (1/10")	-0.0025" to 0.0025"	1"	3/32"	Silver	Black	Etched	21115A26	000000

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 and Scriber


	Inch

Square head checks 90° angles.

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"	21115A14	0000000	21115A18	0000000

Replacement Square Head Lockbolts

		Each
Replacement Lockbolt	21115A36	00000

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


	Inch

Square head checks 90° 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"	21115A13	0000000	21115A17	0000000

Replacement Square Head Lockbolts

		Each
Replacement Lockbolt	21115A36	00000

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

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 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

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 and Scriber


	Inch

Square head checks 90° angles.

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"	21155A34	0000000

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

Mitutoyo Squareness Gauges

Ensure parts are perfectly straight and square—these gauges detect surface deviations so small the human eye can’t see them. As you slide the lever on these gauges up and down, a dial test indicator moves along the vertical surface of your workpiece, measuring how straight and square it is. Checking for slight angles on machined parts or frames verifies they will align properly and function correctly. You can adjust the squareness of the gauges to fine-tune for differences in temperature and humidity and to maintain precision over years of use. Measure an object for height with the scale along the side of the gauge. The housing is cast iron, so the gauges are stable and stand up to frequent use.

					Material		Base
Distance Measured Range, mm	Accuracy, mm	Measuring Increments, mm	Squareness Tolerance, mm	Straightness Tolerance, mm	Housing	Column	Lg.	Wd.	Includes	Mfr. Model No.		Each
0 to 150	-0.003 to 0.003	0.002	0.003	0.002	Cast Iron	Aluminum	7"	4"	Dial Indicator, Micrometer	311-215	6883N11	000000000
0 to 250	-0.003 to 0.003	0.002	0.009	0.0035	Cast Iron	Aluminum	7"	4"	Dial Indicator, Micrometer	311-225	6883N12	00000000
0 to 450	-0.003 to 0.003	0.002	0.006	0.0025	Cast Iron	Aluminum	7"	4"	Dial Indicator, Micrometer	311-245	6883N13	00000000