1/4-20 X 3/8" Socket Cap Screws | Flat Head Hex Socket Drive | Alloy Steel Thermal Black Oxide (100 / 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