Square Head Screws | McMaster-Carr

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System of Measurement

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Material

Stainless Steel

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External Square

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Partially Threaded

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Phosphate Coated

Zinc Yellow-Chromate Plated

Fastener Strength Grade/Class

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Specifications Met

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Export Control Classification Number (ECCN)

DFARS Specialty Metals

REACH

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Compliant with Exemptions

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Thread Fit

Metric Class 6g

Metric Class 6h

Unified Standard Class 2A

Unified Standard Class 3A

For Use In

Stainless Steel

Drive Size

Slot Width

How can we improve?

1,030 Products

Fastening and Joining

Set Screws

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

Square Head Screws

Square Head Screws

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

Tapping Screws

Fasten a range of materials together without needing to tap the hole first

Wood Screws

Fasten material to wood or pieces of wood to each other

Socket Head Screws

Socket Head Screws

With a deeper drive than flat and rounded head screws, these withstand more torque for a tighter hold

Drywall Screws

Fasten panels of drywall to materials such as wood, metal, and drywall

Fabricating and Machining

T-Slot Bolts

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

Fixturing Kits

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

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