4-40 X 1/2″ Socket Cap Screws Hex Socket Drive Alloy Steel Black Oxide (300 / Pkg.) Reduced Price

Engineered for durable, high-strength fastening in precision assemblies, the Socket Head Cap Screws Alloy Steel Thermal Black Oxide 4-40 X 1/2 delivers dependable performance in machinery, electronics enclosures, and DIY projects. Crafted from tough alloy steel and finished with a thermally treated black oxide, these screws combine high tensile strength with a smooth, low-gloss surface for clean, professional installations.

Specifications

Material: Alloy steel

Finish: Thermal black oxide

Drive type: Socket hex drive

Thread size: 4-40

Length: 1/2 in (12.7 mm)

Head type: Socket head cap screw

Key benefits

High strength: Alloy steel provides robust load-bearing capability for demanding assemblies.

Smooth operation: Precisely machined threads reduce friction for reliable torque and clamping force.

Low-profile finish: Black oxide finish minimizes glare and aids corrosion resistance in moderate environments.

Versatile compatibility: Standard 4-40 thread size fits a wide range of hardware and components.

Applications

Ideal for machine shops, automotive work, electronics enclosures, robotics, and general maintenance tasks where a durable, compact fastener is required. The 1/2 inch length is suitable for panels and assemblies where space is limited but sufficient thread engagement is needed.

Installation & care

To ensure peak performance, use a compatible hex driver and apply a light lubricant on the threads during installation to reduce galling and achieve accurate torque. Do not exceed recommended torque to avoid stripping the thread or damaging components. Keep fasteners clean and dry when not in use to preserve the finish and integrity.