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Manufacturer Model Number Manufacturer Model Number |
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Blade Material Blade Material |
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Graduation Mark Style Graduation Mark Style |
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Graduation Color Graduation Color |
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![]() | Black |
Angle Measured Angle Measured |
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Specifications Met Specifications Met |
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Center Head Material Center Head Material |
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More
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. All have wear-resistant etched markings.
Square head checks 90° angles. Center head identifies the center on pipes, rods, and shafts. Protractor head measures angles.
Satin-chrome blade finish is corrosion resistant and reduces glare.
Blade | Graduation | Cast Iron Head | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Blade Lg. | Front Grad. Marks (Increments) | Back Grad. Marks (Increments) | Accuracy | Wd. | Thick. | Material | Color | Color | Mark Style | Head Lg. | Each | |
Inch | ||||||||||||
4" | 32nds (4/32"), 64ths (8/64") | 8ths (1"), 16ths (1") | -0.002" to +0.004" | 5/8" | 1/16" | Satin-Chrome Steel | Silver | Black | Etched | 2 1/4" | 0000000 | 000000 |
Replacement Lockbolt for Square and Center Heads | 0000000 | Each | 000000 |
Blade | Graduation | Cast Iron Heads | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Blade Lg. | Front Grad. Marks (Increments) | Back Grad. Marks (Increments) | Accuracy | Wd. | Thick. | Material | Color | Color | Mark Style | Head Lg. | Each | |
Inch | ||||||||||||
4" | 32nds (4/32"), 64ths (8/64") | 8ths (1"), 16ths (1") | -0.002" to +0.004" | 5/8" | 1/16" | Satin-Chrome Steel | Silver | Black | Etched | 2 1/4" | 0000000 | 0000000 |
Replacement Lockbolt for Square and Center Heads | 0000000 | Each | 000000 |
Blade | Graduation | Cast Iron Head | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Blade Lg. | Front Grad. Marks (Increments) | Back Grad. Marks (Increments) | Accuracy | Wd. | Thick. | Material | Color | Color | Mark Style | Head Lg. | Each | |
Inch | ||||||||||||
6" | 32nds (4/32"), 64ths (8/64") | 8ths (1"), 16ths (1") | -0.002" to +0.004" | 3/4" | 5/64" | Steel | Silver | Black | Etched | 2 13/32" | 0000000 | 000000 |
6" | 32nds (4/32"), 64ths (8/64") | 8ths (1"), 16ths (1") | -0.002" to +0.004" | 3/4" | 5/64" | Satin-Chrome Steel | Silver | Black | Etched | 2 13/32" | 0000000 | 000000 |
6" | 32nds (4/32"), 64ths (8/64") | 50ths (1/10"), 100ths (1/10") | -0.002" to +0.004" | 3/4" | 5/64" | Satin-Chrome Steel | Silver | Black | Etched | 2 13/32" | 0000000 | 000000 |
12" | 32nds (4/32"), 64ths (8/64") | 8ths (1"), 16ths (1") | -0.0035" to +0.005" | 1" | 3/32" | Steel | Silver | Black | Etched | 4 1/2" | 0000000 | 00000 |
12" | 32nds (4/32"), 64ths (8/64") | 8ths (1"), 16ths (1") | -0.0035" to +0.005" | 1" | 3/32" | Satin-Chrome Steel | Silver | Black | Etched | 4 1/2" | 0000000 | 000000 |
12" | 32nds (4/32"), 64ths (8/64") | 50ths (1/10"), 100ths (1/10") | -0.0035" to +0.005" | 1" | 3/32" | Satin-Chrome Steel | Silver | Black | Etched | 4 1/2" | 0000000 | 000000 |
18" | 32nds (4/32"), 64ths (8/64") | 8ths (1"), 16ths (1") | -0.0035" to +0.006" | 1" | 3/32" | Satin-Chrome Steel | Silver | Black | Etched | 4 1/2" | 0000000 | 000000 |
24" | 32nds (4/32"), 64ths (8/64") | 8ths (1"), 16ths (1") | -0.0035" to +0.007" | 1" | 3/32" | Satin-Chrome Steel | Silver | Black | Etched | 4 1/2" | 0000000 | 000000 |
Inch/Metric | ||||||||||||
11 3/4"/300mm | 1/2 mm (10 mm), 32nds (4/32") | Millimeters (10 mm), 64ths (8/64") | -0.0035" to +0.005"/ -0.09 mm to +0.15 mm | 1" | 3/32" | Satin-Chrome Steel | Silver | Black | Etched | 4 1/2" | 0000000 | 000000 |
23 1/2"/600mm | 1/2 mm (10 mm), 32nds (4/32") | Millimeters (10 mm), 64ths (8/64") | -0.0035" to +0.007"/ -0.11 mm to +0.25 mm | 1" | 3/32" | Satin-Chrome Steel | Silver | Black | Etched | 4 1/2" | 0000000 | 000000 |
Blade | Graduation | Cast Iron Heads | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Blade Lg. | Front Grad. Marks (Increments) | Back Grad. Marks (Increments) | Accuracy | Wd. | Thick. | Material | Color | Color | Mark Style | Head Lg. | Each | |
Inch | ||||||||||||
6" | 32nds (4/32"), 64ths (8/64") | 8ths (1"), 16ths (1") | -0.002" to +0.004" | 3/4" | 5/64" | Satin-Chrome Steel | Silver | Black | Etched | 2 13/32" | 0000000 | 0000000 |
12" | 32nds (4/32"), 64ths (8/64") | 8ths (1"), 16ths (1") | -0.0035" to +0.005" | 1" | 3/32" | Satin-Chrome Steel | Silver | Black | Etched | 4 1/2" | 0000000 | 000000 |
12" | 32nds (4/32"), 64ths (8/64") | 50ths (1/10"), 100ths (1/10") | -0.0035" to +0.005" | 1" | 3/32" | Satin-Chrome Steel | Silver | Black | Etched | 4 1/2" | 0000000 | 000000 |
18" | 32nds (4/32"), 64ths (8/64") | 8ths (1"), 16ths (1") | -0.0035" to +0.006" | 1" | 3/32" | Satin-Chrome Steel | Silver | Black | Etched | 4 1/2" | 0000000 | 000000 |
24" | 32nds (4/32"), 64ths (8/64") | 8ths (1"), 16ths (1") | -0.0035" to +0.007" | 1" | 3/32" | Satin-Chrome Steel | Silver | Black | Etched | 4 1/2" | 0000000 | 000000 |
Blade | Graduation | Cast Iron Heads | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Blade Lg. | Front Grad. Marks (Increments) | Back Grad. Marks (Increments) | Accuracy | Wd. | Thick. | Material | Color | Color | Mark Style | Head Lg. | Each | |
Inch | ||||||||||||
12" | 32nds (4/32"), 64ths (8/64") | 8ths (1"), 16ths (1") | -0.0035" to +0.005" | 1" | 3/32" | Steel | Silver | Black | Etched | 4 1/2" | 0000000 | 0000000 |
18" | 32nds (4/32"), 64ths (8/64") | 8ths (1"), 16ths (1") | -0.0035" to +0.006" | 1" | 3/32" | Steel | Silver | Black | Etched | 4 1/2" | 0000000 | 000000 |
24" | 32nds (4/32"), 64ths (8/64") | 8ths (1"), 16ths (1") | -0.0035" to +0.007" | 1" | 3/32" | Steel | Silver | Black | Etched | 4 1/2" | 0000000 | 000000 |
Replacement Lockbolt for Square, Center, and Protractor Heads | 0000000 | Each | 000000 |
Blade | Graduation | Cast Iron Heads | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Blade Lg. | Front Grad. Marks (Increments) | Back Grad. Marks (Increments) | Accuracy | Wd. | Thick. | Material | Color | Color | Mark Style | Head Lg. | Each | |
Inch | ||||||||||||
12" | 32nds (4/32"), 64ths (8/64") | 8ths (1"), 16ths (1") | -0.0035" to +0.005" | 1" | 3/32" | Steel | Silver | Black | Etched | 4 1/2" | 0000000 | 0000000 |
12" | 32nds (4/32"), 64ths (8/64") | 50ths (1/10"), 100ths (1/10") | -0.0035" to +0.005" | 1" | 3/32" | Steel | Silver | Black | Etched | 4 1/2" | 0000000 | 000000 |
18" | 32nds (4/32"), 64ths (8/64") | 8ths (1"), 16ths (1") | -0.0035" to +0.006" | 1" | 3/32" | Steel | Silver | Black | Etched | 4 1/2" | 0000000 | 000000 |
24" | 32nds (4/32"), 64ths (8/64") | 8ths (1"), 16ths (1") | -0.0035" to +0.007" | 1" | 3/32" | Steel | Silver | Black | Etched | 4 1/2" | 0000000 | 000000 |
Inch/Metric | ||||||||||||
11 3/4"/300mm | 1/2 mm (10 mm), 32nds (4/32") | Millimeters (10 mm), 64ths (8/64") | -0.0035" to +0.005"/-0.09 mm to +0.15 mm | 1" | 3/32" | Steel | Silver | Black | Etched | 4 1/2" | 0000000 | 000000 |
23 1/2"/600mm | 1/2 mm (10 mm), 32nds (4/32") | Millimeters (10 mm), 64ths (8/64") | -0.0035" to +0.007"/-0.11 mm to +0.25 mm | 1" | 3/32" | Steel | Silver | Black | Etched | 4 1/2" | 0000000 | 000000 |
Replacement Lockbolt for Square, Center, and Protractor Heads | 0000000 | Each | 000000 |
Attach to Starrett High-Accuracy Combination Square Blades with the included lockbolts.
Square head checks 90° angles. Center head identifies the center on pipes, rods, and shafts. Protractor head measures angles.
Protractor | |||||
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Component | For Blade Lgs. | Angle Measuring Range | Graduation Marks (Numeric Increments) | Each | |
Cast Iron | |||||
Square Head | 4" | __ | __ | 0000000 | 000000 |
Square Head with Built-in Level | 6" | __ | __ | 0000000 | 00000 |
Square Head with Built-in Level | 12"-48" | __ | __ | 0000000 | 00000 |
Center Head | 4" | __ | __ | 0000000 | 00000 |
Center Head | 6" | __ | __ | 0000000 | 00000 |
Center Head | 12"-48" | __ | __ | 0000000 | 00000 |
Nonreversible Protractor Head with Built-in Level | 12"-48" | 0°-180° | 1° (10°) | 0000000 | 000000 |
Reversible Protractor Head with Built-in Level | 12"-48" | 0°-180° | 1° (10°) | 0000000 | 000000 |
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. All have a corrosion-resistant satin-chrome finish that reduces glare and wear-resistant etched markings.
Square head checks 90° angles. Center head identifies the center on pipes, rods, and shafts. Protractor head measures angles.
Hardened cast iron heads are more durable and last longer than cast iron heads.
Blade | Graduation | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Blade Lg. | Front Grad. Marks (Increments) | Back Grad. Marks (Increments) | Accuracy | Wd. | Thick. | Material | Color | Color | Mark Style | Head Lg. | Each | |
Cast Iron Head | ||||||||||||
Inch | ||||||||||||
12" | 32nds (4/32"), 64ths (8/64") | 8ths (1"), 16ths (1") | -0.0025" to +0.0025" | 1" | 3/32" | Satin-Chrome Steel | Silver | Black | Etched | 4 1/2" | 00000000 | 000000 |
Hardened Cast Iron Head | ||||||||||||
Inch | ||||||||||||
12" | 32nds (4/32"), 64ths (8/64") | 8ths (1"), 16ths (1") | -0.0025" to +0.0025" | 1" | 3/32" | Satin-Chrome Steel | Silver | Black | Etched | 4 1/2" | 00000000 | 00000 |
Replacement Lockbolt | 00000000 | Each | 00000 |
Blade | Graduation | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Blade Lg. | Front Grad. Marks (Increments) | Back Grad. Marks (Increments) | Accuracy | Wd. | Thick. | Material | Color | Color | Mark Style | Head Lg. | Each | |
Cast Iron Heads | ||||||||||||
12" | 32nds (4/32"), 64ths (8/64") | 8ths (1"), 16ths (1") | -0.0025" to +0.0025" | 1" | 3/32" | Satin-Chrome Steel | Silver | Black | Etched | 4 1/2" | 00000000 | 0000000 |
Hardened Cast Iron Heads | ||||||||||||
12" | 32nds (4/32"), 64ths (8/64") | 8ths (1"), 16ths (1") | -0.0025" to +0.0025" | 1" | 3/32" | Satin-Chrome Steel | Silver | Black | Etched | 4 1/2" | 00000000 | 000000 |
Replacement Lockbolt | 00000000 | Each | 00000 |
Blade | Graduation | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Blade Lg. | Front Grad. Marks (Increments) | Back Grad. Marks (Increments) | Accuracy | Wd. | Thick. | Material | Color | Color | Mark Style | Head Lg. | Each | |
Cast Iron Heads | ||||||||||||
Inch | ||||||||||||
12" | 32nds (4/32"), 64ths (8/64") | 8ths (1"), 16ths (1") | -0.0025" to +0.0025" | 1" | 3/32" | Satin-Chrome Steel | Silver | Black | Etched | 4 1/2" | 00000000 | 0000000 |
Hardened Cast Iron Heads | ||||||||||||
Inch | ||||||||||||
12" | 32nds (4/32"), 64ths (8/64") | 8ths (1"), 16ths (1") | -0.0025" to +0.0025" | 1" | 3/32" | Satin-Chrome Steel | Silver | Black | Etched | 4 1/2" | 00000000 | 000000 |
Replacement Lockbolt | 00000000 | Each | 00000 |
Attach to High-Accuracy Combination Square Blades with the included lockbolts.
Square head checks 90° angles. Center head identifies the center on pipes, rods, and shafts. Protractor head measures angles.
Hardened cast iron heads are more durable and last longer than cast iron heads.
Protractor | |||||
---|---|---|---|---|---|
Component | For Blade Lgs. | Angle Measuring Range | Graduation Marks (Numeric Increments) | Each | |
Cast Iron | |||||
Square Head with Built-in Level | 12"-24" | __ | __ | 00000000 | 000000 |
Center Head | 12"-24" | __ | __ | 00000000 | 00000 |
Reversible Protractor Head | 12"-24" | 0°-180° | 1° (10°) | 00000000 | 00000 |
Hardened Cast Iron | |||||
Square Head with Built-in Level | 12"-24" | __ | __ | 00000000 | 00000 |
Center Head | 12"-24" | __ | __ | 00000000 | 00000 |
Replacement Lockbolt | 00000000 | Each | 00000 |
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. All have wear-resistant etched markings.
Square head checks 90° angles. Center head identifies the center on pipes, rods, and shafts. Protractor head measures angles.
Blade | Graduation | Cast Iron Head | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Blade Lg. | Front Graduation Marks (Numeric Increments) | Back Graduation Marks (Numeric Increments) | Accuracy | Wd. | Thick. | Material | Color | Color | Mark Style | Head Lg. | Each | |
Inch | ||||||||||||
12" | 32nds (4/32"), 64ths (8/64") | 8ths (1"), 16ths (1") | -0.002" to +0.002" | 1" | 3/32" | Titanium-Coated Steel | Gold | Black | Etched | 4 1/2" | 00000000 | 0000000 |
Blade | Graduation | Cast Iron Heads | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Blade Lg. | Front Graduation Marks (Numeric Increments) | Back Graduation Marks (Numeric Increments) | Accuracy | Wd. | Thick. | Material | Color | Color | Mark Style | Head Lg. | Each | |
Inch | ||||||||||||
12" | 32nds (4/32"), 64ths (8/64") | 8ths (1"), 16ths (1") | -0.002" to +0.002" | 1" | 3/32" | Titanium-Coated Steel | Gold | Black | Etched | 4 1/2" | 00000000 | 0000000 |
Gray cast iron machines faster with less wear on cutting tools than most types of steel. It also absorbs vibration, so finished parts run quieter than those made of steel. It's often fabricated into gears, pulleys, and bushings.
Certificates with a traceable lot number are available for these products. Download certificates from ACTIVITY after your order ships.
Grind these hardened steel blanks to the size and shape you need.
PM T15 high-speed steel has excellent wear resistance and good heat resistance for use on all metal and plastic.
Shank | PM T15 High-Speed Steel | |||||
---|---|---|---|---|---|---|
Wd. | Ht. | Overall Lg. | End Shape | Bevel Angle | Each | |
1/8" | 1/8" | 2 1/2" | Beveled | 10° | 0000000 | 000000 |
3/16" | 3/16" | 2 1/2" | Beveled | 10° | 0000000 | 00000 |
1/4" | 1/4" | 2 1/2" | Beveled | 10° | 0000000 | 00000 |
5/16" | 5/16" | 2 1/2" | Beveled | 10° | 0000000 | 00000 |
3/8" | 3/8" | 3" | Beveled | 10° | 0000000 | 00000 |
7/16" | 7/16" | 3 1/2" | Beveled | 10° | 0000000 | 00000 |
1/2" | 1/2" | 4" | Beveled | 10° | 0000000 | 00000 |
5/8" | 5/8" | 4 1/2" | Beveled | 10° | 0000000 | 00000 |
3/4" | 3/4" | 5" | Beveled | 10° | 0000000 | 00000 |
7/8" | 7/8" | 6" | Beveled | 10° | 0000000 | 000000 |
1" | 1" | 7" | Beveled | 10° | 0000000 | 000000 |
Adjust a surface into a level position on multiple planes.
Two-plane levels have two vials set at 90° angles to allow you to level in two directions simultaneously.
No. of Vials | Housing | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
For Max. No. of Planes | Lg. | Wd. | Ht. | Horizontal | Vertical | Sensitivity | Material | Color | Vial Material | Each | |
L | |||||||||||
2 | 2 3/4" | 5/8" | 2 3/4" | 1 | 1 | 0.065 in./ft., 19 min./0.1" | Cast Iron | Black | Glass | 0000000 | 000000 |
These levels come with a calibration certificate traceable to NIST that states they've passed a test for accuracy. They are precision-machined and check the accuracy of both horizontal and vertical surfaces simultaneously with two highly sensitive vials set at 90° angles.
V-groove provides stability on curved surfaces.
No. of Vials | Housing | Mounting Holes | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Lg. | Wd. | Ht. | For Max. No. of Planes | Horizontal | Vertical | Sensitivity | Material | Color | Vial Material | Mounting Fasteners Included | No. of | Dia. | Features | Each | |
T | |||||||||||||||
3 5/32" | 2 9/16" | 0.667" | 2 | 1 | 1 | 0.001 in./ft., 0 min./0.1" | Cast Iron | __ | Glass | No | 2 | 0.22" | __ | 000000000 | 0000000 |
Square | |||||||||||||||
8" | 1 9/16" | 8" | 2 | 1 | 1 | 0.0006 in./ft., 0 min./0.1" | Cast Iron | Green | Glass | __ | __ | __ | V-Groove | 00000000 | 00000000 |
Check the accuracy of horizontal and vertical surfaces with these precision-machined levels. They have two highly sensitive vials set at 90° angles for checking two planes at the same time.
V-groove provides stability on curved surfaces.
No. of Vials | Housing | Mounting Holes | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Lg. | Wd. | Ht. | For Max. No. of Planes | Horizontal | Vertical | Sensitivity | Material | Color | Vial Material | Mounting Fasteners Included | No. of | Dia. | Features | Each | |
T | |||||||||||||||
3 5/32" | 2 9/16" | 0.667" | 2 | 1 | 1 | 0.001 in./ft., 0 min./0.1" | Cast Iron | __ | Glass | No | 2 | 0.22" | __ | 00000000 | 0000000 |
Square | |||||||||||||||
8" | 1 9/16" | 8" | 2 | 1 | 1 | 0.0006 in./ft., 0 min./0.1" | Cast Iron | Green | Glass | __ | __ | __ | V-Groove | 0000000 | 00000000 |