Machine Bolts | McMaster-Carr

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Finish

Corrosion-Resistant Coated

Dyed

Hot-Dipped Galvanized

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Fastener Strength Grade/Class

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Federal Specification

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Tensile Strength

10,000 psi to 19,999 psi

20,000 psi to 29,999 psi

30,000 psi to 99,999 psi

100,000 psi or greater

Thread Fit

Unified Standard Class 2A

Unified Standard Class 2B

Unified Standard Class 3A

Not Rated

DFARS Specialty Metals

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Compliant with Exemptions

Not Compliant

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Compliant

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U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Yes

Export Control Classification Number (ECCN)

39,594 Products

Fastening and Joining

Square Head Screws

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

145 products

Hex Head Screws

Used with nuts to create a stronger joint than flat and rounded screws

11,773 products

Socket Head Screws

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

7,992 products

Flat Head Screws

Fit in countersunk holes for a flush finish that won't snag on surrounding parts

6,263 products

Rounded Head Screws

Sit just above the surface for a low-profile finish and hold tighter than flat head screws

10,439 products

12-Point Screws

12 contact points handle more torque than a hex head while a flange eliminates the need for a washer

208 products

Tapping Screws

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

2,317 products

Oval Head Screws

The domed top sits slightly above the surface of countersunk holes for a decorative look

307 products

Fastener Assortments

Keep a variety of common screws, nuts, and washers on hand

10 products

Concrete Screws

Anchor parts to concrete, block, and brick without tapping the hole first

39 products

Pentagon Head Screws

Create a tamper-resistant joint with a head than can only be removed with a 5-point socket

17 products

Electrical Power, Networking, and Controlling

Electrical Enclosure Fasteners

Mount components to your enclosure without worrying about leaks

3 products

Fabricating and Machining

T-Tracks

A versatile foundation for custom fixturing setups

4 products