Machinists' Squares | McMaster-Carr

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System of Measurement

Blade Length

Blade Thickness

Blade Width

Material

Stainless Steel

Angle Measured

Length

Head Length

Blade Material

Stainless Steel

Color

Square Head Material

Width

Measuring Component

Protractor Head

Square Head with Built-In Level

Graduation Color

Graduations

Export Control Classification Number (ECCN)

Numeric Graduations

RoHS

Compliant with Exemptions

DFARS Specialty Metals

REACH

Length Accuracy

-0.0035" to 0.005"

-0.0035" to 0.006"

-0.0035" to 0.007"

-0.0025" to 0.0025"

-0.002" to 0.002"

-0.002" to 0.004"

-0.11 mm to 0.25 mm

-0.09 mm to 0.15 mm

Graduation Type

Thickness

Performance

Scratch Resistant

Manufacturer

Manufacturer Model Number

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171 Products

Squares

High-Accuracy Squares

High-Accuracy Squares

Manufactured with precision to ensure reliable, repeatable angles

High-Accuracy Square Sets

High-Accuracy Square Sets

Multiple sizes made with precision to ensure reliable, repeatable angles

Squares with 2 Graduated Blades

Squares with 2 Graduated Blades

Make both horizontal and vertical measurements

Easy-Read Squares with 2 Graduated Blades

Easy-Read Squares with 2 Graduated Blades

Large numbers and dark graduations make measurements easy to read

Squares

Square inside and out for basic angle checking and marking

Squares with Adjustable Blade

Squares with Adjustable Blade

Measure and mark material exactly where you need to with a sliding blade

Laser Squares

Lay out machine tables and work stations at precise right angles

Starrett High-Accuracy Squares

Starrett High-Accuracy Squares

Manufactured with precision to ensure reliable, repeatable angles

Combination Squares

Combination Squares

Measure, mark, and level with a single tool

Starrett High-Accuracy Combination Squares

Starrett High-Accuracy Combination Squares

Manufactured with precision to measure, mark, and level with a single tool

Heavy Duty Combination Squares

Heavy Duty Combination Squares

Extra-wide head and large thumbwheel are easy to adjust with gloves

High-Accuracy Combination Squares

High-Accuracy Combination Squares

Manufactured with precision to measure, mark, and level with a single tool

Scratch-Resistant High-Accuracy Combination Squares

Scratch-Resistant High-Accuracy Combination Squares

A titanium coating protects the blade against scratches and wear

Angle Squares

Measure angles up to 90 degrees; also known as rafter square

Pipefitting Squares

Pipefitting Squares

Pipe fitting sizes and welding charts are etched in to resist wearing off

T-Profile Squares

Create straight lines in drafting, graphics, and construction applications

Other Products

Combination Square Heads

Combination Square Heads

Attach combination square blades to form a combination square

Combination Square Blades

Combination Square Blades

Connect to a combination square head to create a combination square

Calibration Squares

Calibration Squares

Lay horizontally or vertically on CNC machines to check the position of tools with high precision

Squareness Gauges

Squareness Gauges

Check frames and machined parts to see if they are leaning or uneven

The quick brown fox jumped over the lazy dog. Pedestal (35" Ht. x 4" Wd. x 4" Dp.)