[100 PKG] Cap Screws Button Socket Steel Black Oxide 4-40 X 1/2

Upgrade your assemblies with these Cap Screws Button Socket, crafted from durable steel and finished in black oxide for a sleek, low-profile look. The 4-40 thread size and 1/2″ length make these small but mighty fasteners ideal for precision projects, electronics enclosures, and lightweight mechanical assemblies.

Designed for reliability, these button head socket cap screws deliver a clean, flush appearance while providing strong holding power. The internal hex drive (Allen drive) ensures easy installation with a standard Allen wrench, reducing the risk of slippage and cam-out in tight spaces.

Specifications

• Thread size: 4-40
• Length: 1/2″
• Head style: Button head socket cap screw
• Drive: Internal hex (Allen)
• Material: Steel
• Finish: Black oxide

This combination of steel construction and black oxide finish provides durability with a corrosion-resistant surface and a low-reflective, professional appearance. Perfect for applications where a compact, secure fastener is required without protruding heads, such as electronics housings, cabinetry, machinery dashboards, and precision instruments.

Add these cap screws to your toolkit and ensure fast, reliable assemblies with a finish that looks as good as it performs.