Squares | McMaster-Carr

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System of Measurement

Thickness

Width

Length

Shape

Rectangular Tube

Material

Cotton/Polyester Fabric

Blade Length

Color

Fluorescent Amber

Fluorescent Blue

Backing Type

Hardness Rating

RoHS

Compliant with Exemptions

Hardness

REACH

Export Control Classification Number (ECCN)

DFARS Specialty Metals

Blade Width

Performance

Chemical Resistant

Corrosion Resistant

Easy Thermoform

Electrically Insulating

Erosion Resistant

Flame Resistant

Texture

Maximum Temperature

Less than 1,000° F

1,000° F to 1,999° F

2,000° F to 2,999° F

3,000° F to 3,999° F

4,000° F or greater

Specifications Met

CARB Compliant 17 CCR 93120

CPSC Compliant 16 CFR 1201 Category I and II

Federal Specification

Head Length

Blade Thickness

Diameter

Tolerance Rating

Angle Measured

0 min to 120 min

Graduations

How can we improve?

16,808 Products

Measuring and Inspecting

Squares

Check 90° angles during layout work with combination, angle, or pipefitters' squares

Square Holding Clamps

Square Holding Clamps

Position squares for repeat checking and marking

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

Protractors

Set bevels and measure angles with everything from pocket-size to long-arm protractors

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

Straightedges

Draw straight lines and check the straightness of surfaces

Angle Transfers

Angle Transfers

Duplicate any angle in construction and other applications

Straightedge/Protractors

Straightedge/Protractors

Draw straight lines and measure angle, slope, and rise with one tool

Levels

Ensure surfaces are completely horizontal or vertical

Color Calibrators

Color Calibrators

Calibrate your color meter to identify colors with precision

Raw Materials

Steel

Strong, machinable, and weldable—all with material certificates for traceability

Aluminum

Lightweight, easy to machine, and corrosion resistant—all with material certificates for traceability

Stainless Steel

Stainless Steel

Resists corrosion and chemicals in most environments—all with material certificates for traceability

Plastic

A lightweight alternative to metal and glass

Rubber

Compresses and bounces back to shape; often used for sealing, cushioning, and shock absorbing

Brass

More machinable than copper and bronze—all with material certificates for traceability

Foam

Pockets of air make it lighter in weight than rubber; good for packing, insulating, and sealing

Copper

Our most conductive metal for electrical applications—all with material certificates for traceability

Tungsten

Our densest metal resists wear and heat to make end mills, heat shields, electrodes, and more

Glass

Clear and highly heat and chemical resistant; often used in sights, lighting, and lab equipment

Fiberglass

A lightweight alternative to metal and wood widely used in electrical and structural applications

Garolite

A strong, machinable alternative to metal and plastic widely used in circuit boards and gears

Bronze

Better wear resistance than copper and brass—all with material certificates for traceability

Titanium

The most corrosion-resistant metal we offer—all with material certificates for traceability

Lead

A dense insulator often used to shield against radiation and absorb sound and vibration

Ceramic

Hard and wear resistant, it also withstands corrosion and high temperatures

Nickel

An upgrade from stainless steel to withstand harsh chemicals and acids—all with material certificates for traceability

Carbon Fiber

The strongest composite we offer; comparable in strength to 6061 aluminum but lighter in weight

Aramid

Strong, lightweight, and an excellent thermal insulator; also known as Nomex

Wood

Commonly used to build ramps, crates, and prototypes or to make repairs

Tin

Soft and malleable for forming gaskets and filters; also mixes with other metals to make solder

Hard Fiber

Chemically treated to be hard and dense, this is the easiest composite to machine in our offering

Zinc

Draws corrosion away from nearby metal; an alternative to lead for sound barriers and vibration dampers

Carbon

An electrical conductor that’s often used in electronics and sensors

Graphite

Compressible or conductive for making high-temperature seals, furnace parts, and crucibles

Niobium

Conductive and corrosion resistant even at extreme temperatures—all with material certificates for traceability

Fabricating and Machining

Fixture Squares

Fixture Squares

Build different fixtures on multiple sides of the same block

Rotary Angle Indexers

Rotary Angle Indexers

Position round workpieces at precise, repeatable angles for machining flats, hexes, and key slots

Clamps

Hold workpieces securely in place

Dovetail Blanks

Dovetail Blanks

Machine a blank workpiece with precut dovetails and locating slots for easy setup

Multitools

A variety of tools and blades all in one

Lathe Tool Blanks

Lathe Tool Blanks

Machine custom lathe tool bits

Prototyping Foam

Prototyping Foam

Carve, mill, or sand into lightweight parts for testing

Fastening and Joining

Shim Stock

Cut into custom shapes to align, space, and level components on dies, presses, and machinery

Shims

Align and space components on shafts, or level machinery, cabinets, and doors

Machine Key Stock

Machine Key Stock

Cut a custom length to transfer torque from shafts to components such as gears and sprockets

Tape

Bind, seal, and mark surfaces

Building and Machinery Hardware

Bolt-Together Framing and Fittings

Bolt-Together Framing and Fittings

Fasten through equally spaced holes to build and adjust guards, tables, and racks

Weld-Together Framing and Fittings

Weld-Together Framing and Fittings

Permanently join rails and fittings to assemble heavy duty racks, shelving, and work tables

Sealing

Gasket Material

Gasket Material

Cut custom shapes and sizes to fill gaps between flat surfaces

Electrical

Thermal Interface Material

Thermal Interface Material

Dissipate heat away from electronic components

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