Trending 1/4-20 X 3/8″ Socket Cap Screws Flat Head Hex Socket Drive Alloy Steel Thermal Black Oxide (200 / Pkg.)

Cap Screws Flat Socket Alloy Thermal Black Oxide 1/4-20 x 3/8 is a high-strength fastening solution designed for precision assemblies in mechanical, automotive, and industrial environments. The combination of alloy steel and a thermal black oxide finish delivers reliable performance with a discreet, low-profile appearance.

Key features

Material: Alloy steel for strength and durability

Finish: Thermal black oxide for a non-reflective, protective coating and improved wear

Size: 1/4-20 thread (UNC)

Length: 3/8 inch

Head/Drive: Flat socket cap screw with hex socket drive for consistent torque transfer

Why choose these fasteners

High-strength fastening: Cap screws are designed to withstand demanding loads in assemblies

Low profile: Flat socket head sits flush in recessed or tight spaces

Easy to install: Compatible with standard hex keys (Allen wrenches) for quick, secure tightening

Appearance and protection: Subdued black oxide improves aesthetics and guards against minor wear

Applications

Ideal for equipment housings, machinery, consumer electronics enclosures, automotive assemblies, and DIY projects where a reliable, compact fastener is required.

Specifications

Thread size: 1/4-20 UNC

Length: 3/8 in (9.5 mm)

Material: Alloy steel

Finish: Thermal black oxide

Drive type: Hex socket

Head type: Flat socket cap screw