Square Heads | McMaster-Carr

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System of Measurement

Thread Size

Length

Material

Fastener Head Type

Pipe Size

Head Width

Thread Type

UN/UNF (SAE Straight)

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Fitting Type

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Tip Type

Head Height

Fastener Strength Grade/Class

Pipe Material

For Use With

Acetic Acid (White Vinegar) (5% Concentration)

Hydrochloric Acid (10% Concentration)

Natural Gas

Oil

Phosphoric Acid (85% Concentration)

Sodium Hydroxide (Caustic Soda)

Steam

Sulfuric Acid (30% Concentration)

Gender

Finish

Zinc Phosphate Coated

Zinc Plated

Zinc Yellow-Chromate Plated

RoHS

Compliant

Compliant with Exemptions

Not Compliant

DFARS Specialty Metals

REACH

Export Control Classification Number (ECCN)

Specifications Met

Fed. Spec. QQ-A-200/8

Thread Length

Maximum Pressure @ Temperature

1,446 Products

Fastening and Joining

Set Screws

Exert pressure at the tip to hold parts in place, unlike screws that hold material together with threads

251 products

Square Head Screws

Turn the large flat sides with a wrench into square holes that stop further rotation

145 products

Measuring and Inspecting

Combination Square Heads

Attach combination square blades to form a combination square

28 products

Fluid Handling

Pipe and Fittings

Generally thicker and more rigid than tubing for distributing liquids and gases

586 products

Fabricating and Machining

T-Slot Bolts

Secure clamps and workpieces to machine tables with quicker setup than a T-slot nut and stud

262 products

T-Slot Cleaners

Scrape debris out of machine table T-slots

2 products

Fixture Kits

Everything needed to mount workpieces of different sizes to your machine table

50 products

Building and Machinery Hardware

Protective Plugs

Insert into holes in pipe, containers, panels, and parts to keep out debris

78 products

Protective Caps

Protect just about anything, including pipe, flanges, screws, and posts

42 products