Square Tubing | McMaster-Carr

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System of Measurement

Outside Width

Outside Height

Shape

Wall Thickness

Inside Width

Material

Length

Inside Height

Outside Corner Shape

Inside Corner Shape

Post Width

Width

Rail Style

I-Slotted/Single Flanged

Thickness

Specifications Met

ANSI/MSS SP-58 Type 23

ASTM Standard

EN Standard

Fed. Spec. WW-H-171 Type 23

Appearance

Yield Strength

31,000 psi to 33,999 psi

34,000 psi to 39,999 psi

40,000 psi to 69,999 psi

70,000 psi or greater

Rail Height

Bolt-Together Framing Component

Performance

Electrically Insulating

RoHS

Compliant with Exemptions

Not Compliant

REACH

Compliant

Not Compliant

Export Control Classification Number (ECCN)

2B999

9A991

EAR99

DFARS Specialty Metals

4,580 Products

Raw Materials

Steel

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

77 products

Stainless Steel

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

61 products

Aluminum

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

70 products

Plastic

A lightweight alternative to metal and glass

16 products

Brass

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

7 products

Fiberglass

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

23 products

Garolite

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

4 products

Carbon Fiber

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

6 products

Rubber

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

21 products

Building and Machinery Hardware

Bolt-Together Framing and Fittings

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

125 products

Weld-Together Framing and Fittings

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

40 products

T-Slotted Framing and Fittings

The most versatile system, attach fittings along the continuous slots to build virtually anything

2,269 products

Strut Channel Framing and Fittings

Secure fittings in the U-shaped channel to route conduit and pipe or build other structures

1,150 products

Press-Fit Framing and Fittings

Set up temporary partitions, guards, and displays using only a hammer

90 products

Locking-Slotted Framing and Fittings

Make platforms, bases, and other structures that stand up to more movement than T-slotted framing

12 products

Push-to-Close Latches

Automatically hold doors shut when you push them closed

9 products

Containers, Storage, and Furniture

Stacking Caps and Targets

Turn the ends of posts into stackable shelving and rack systems

6 products

Metal Panels

Close off openings in structures while allowing air to pass through

254 products

Material Handling

Shipping Tubes

Protect rods, rolled-up blueprints, and other long, thin objects during shipping

180 products

Beam Clamps

Secure lines of pipe and duct, overhead equipment, and lighting fixtures to beam flanges

9 products

Measuring and Inspecting

Stroboscopes

Shine a bright flashing light at moving belts and pulleys to measure speed and detect wear

3 products

Electrical

Electrical Enclosure Mounting Channels

Position components inside electrical enclosures without drilling holes, which can leak

9 products

Manual Switches

Everything from toggle, push-button, and rocker switches to foot switches

10 products

Fabricating and Machining

Strut Channel Cutters

Shear strut channel down to size using a die instead of a blade for safer, cleaner cuts

1 product