Cap Screws | McMaster-Carr

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Corrosion-Resistant Coated

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Hot-Dipped Galvanized

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Federal Specification

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Tensile Strength

20,000 psi to 39,999 psi

40,000 psi to 59,999 psi

60,000 psi to 99,999 psi

100,000 psi or greater

Thread Fit

Unified Standard Class 2A

Unified Standard Class 2B

Unified Standard Class 3A

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Compliant with Exemptions

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Export Control Classification Number (ECCN)

37,107 Products

Fastening and Joining

Socket Head Screws

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

8,012 products

Hex Head Screws

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

10,148 products

Rounded Head Screws

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

10,401 products

Flat Head Screws

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

6,266 products

Fastener Assortments

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

13 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

Captive Panel Screws

Secure panels and enclosures while still having access to them

201 products

Oval Head Screws

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

307 products

Square Head Screws

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

145 products

Tapping Screws

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

1,166 products

Pentagon Head Screws

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

15 products

Standoff Caps

Create a finished look on standoffs and protect them from dirt and debris

66 products

Building and Machinery Hardware

Protective Caps

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

37 products

Protective Plugs

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

3 products

Clamp-On Framing and Fittings

Two-piece fittings let you modify assembly stations, conveyors, and racks without dismantling them

1 product

Communication

Reference Charts

Check decimal equivalents, drill sizes, or specifications for socket screws

2 products

Electrical

Electrical Enclosure Fasteners

Mount components to your enclosure without worrying about leaks

3 products

Facility and Grounds Maintenance

Toilet Seat Fasteners

Secure toilet seat hinges to your toilet bowl

1 product

Fabricating and Machining

T-Tracks

Add fixturing to flat surfaces on machines such as table saws, CNC routers, and drill presses

4 products