Layout Squares | McMaster-Carr

	System of Measurement System of Measurement

Inch

Metric

	Blade Length Blade Length

	Blade Width Blade Width

	Blade Thickness Blade Thickness

	Material Material

	Graduation Marks Graduation Marks

	Length Length

	Color Color

	Silver		Clear
	Gray		Black
	Blue

	Angle Measured Angle Measured

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	Component Component

Blade

Square Head with Built-in
Level

Square Head

Center Head

Nonreversible Protractor
Head with Built-in Level

Reversible Protractor Head

Reversible Protractor Head
with Built-in Level

	Numeric Increments Numeric Increments

	Graduation Location Graduation Location

	Thickness Thickness

	Width Width

	Blade Material Blade Material

Steel

Stainless Steel

Aluminum

	Square Head Material Square Head Material

	Graduation Mark Style Graduation Mark Style

Etched

Printed

Embossed

	Head Length Head Length

	Graduation Color Graduation Color

	Black
	White
	Silver

	Manufacturer Model Number Manufacturer Model Number

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

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198 Products

Squares

Laser Squares

Lay out machine tables and work stations at precise right angles. This laser generates two red lines that form a 90° angle.

Squares with Graduations on Both Blades

Also known as carpenters’ and framing squares, these have graduations on both blades for horizontal and vertical measurements.

High-Accuracy Square Sets

Ensure reliable, repeatable angles.

High-Accuracy Squares

Ensure reliable, repeatable angles.

Squares with Adjustable Blade

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

Squares

Also known as try squares, these are square inside and out for checking and marking angles.

Starrett High-Accuracy Squares

These squares meet Fed. Spec. GGG-S-656-E, which establishes uniform standards for square accuracy to ensure reliable, repeatable angles.

Combination Squares

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.

Starrett High-Accuracy Combination Square Blades

Use these blades with Starrett High-Accuracy Combination Square Heads. They meet Fed. Spec. GGG-R-791H, which establishes uniform standards for accuracy, graduations, and size.

Starrett High-Accuracy Combination Square Heads

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

Combination Squares

Replace your try square, miter square, depth gauge, marking gauge, 90° level, ruler, and scriber with one tool.

High-Accuracy Combination Square Blades

Blades are for use with High-Accuracy Combination Square Heads.

High-Accuracy Combination Squares

Use these squares in place of your try square, miter square, depth gauge, height gauge, center-point finder, and level.

High-Accuracy Combination Square Heads

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

Scratch-Resistant High-Accuracy Combination Squares

A titanium coating protects the blade against scratches and wear.

Angle Squares

Also known as rafter squares, these have a 0° to 90° scale for measuring angles.

Pipefitters' Squares

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

Layout Marking and Drafting Tools

Folding Triangle Straightedges

Unfold and lock the corners to form a triangle for marking angles.

Triangle Straightedges

Mark and cut straight lines or 90° angles.

Triangle Straightedges/Protractors

A protractor and triangle in one, use these tools to quickly set any angle from 0° to 90°.

T-Squares

Draw and cut straight lines in drafting, graphics, and construction applications.

Straightedges

Use these highly accurate straightedges as a guide to scribe and cut straight lines and to check surface straightness.

Angle Transfers

Duplicate or transfer any angle.

Multi-Angle Transfers

Transfer multiple angles, draw parallel lines, or create a template to make repeated patterns and measurements.

Center Finders for Curved Surfaces

Center your work by mounting these into your drill chuck or collet and lining up the pointer with the mark on the shaft.

Parallel Straightedges

Level machinery, check surface flatness, and scribe work positions.