Square Stock | McMaster-Carr

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CPSC Compliant 16 CFR 1201 Category I and II

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Compliant with Exemptions

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DFARS Specialty Metals

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10,000 psi to 19,999 psi

20,000 psi to 99,999 psi

100,000 psi to 199,999 psi

200,000 psi or greater

Not Rated

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17,240 Products

Raw Materials

Steel

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

1,111 products

Aluminum

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

2,908 products

Stainless Steel

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

2,064 products

Plastic

A lightweight alternative to metal and glass

2,566 products

Brass

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

301 products

Rubber

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

4,319 products

Bronze

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

223 products

Titanium

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

82 products

Copper

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

489 products

Foam

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

837 products

Garolite

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

869 products

Tungsten

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

20 products

Ceramic

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

222 products

Carbon Fiber

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

78 products

Fiberglass

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

187 products

Aramid

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

10 products

Graphite

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

18 products

Cobalt

Resists impact and rapid temperature changes—all with material certificates for traceability

1 product

Nickel

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

76 products

Lead

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

63 products

Carbon

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

19 products

Glass

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

91 products

Niobium

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

6 products

Zinc

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

4 products

Mica

An electrical insulator that resists high temperatures; use in circuit breakers and heating elements

145 products

Tin

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

8 products

Fabricating and Machining

Lathe Tool Blanks

Machine custom lathe tool bits

48 products

Dovetail Blanks

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

5 products

Prototyping Foam

Carve, mill, or sand into lightweight parts for testing

8 products

Building and Machinery Hardware

Bolt-Together Framing and Fittings

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

121 products

Weld-Together Framing and Fittings

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

26 products

Fastening and Joining

Shim Stock

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

190 products

Shims

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

9 products

Machine Key Stock

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

2 products

Electrical Power, Networking, and Controlling

Thermal Interface Pads

Soft and flexible, so they conform to rough surfaces and fill gaps between two surfaces

24 products

Sealing

Gasket Material

Cut custom shapes and sizes to fill gaps between flat surfaces

72 products

Safety Equipment

Fire Stops

Prevent fire and smoke from passing through holes in fire-resistant walls and floors

18 products