Square Heads | McMaster-Carr

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System of Measurement

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Zinc Phosphate Coated

Zinc Plated

Zinc Yellow-Chromate Plated

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Slot Width

DFARS Specialty Metals

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Compliant with Exemptions

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Export Control Classification Number (ECCN)

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Specifications Met

Fed. Spec. QQ-A-200/8

Head Length

For Use With

Inside Width

Thread Fit

Unified Standard Class 2A

Unified Standard Class 3A

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1,025 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

Fabricating and Machining

T-Slot Bolts

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

137 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

48 products

Fluid Handling

Pipe Plugs

Insert into the ends of pipe to keep out dirt and debris

294 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