4-40 x 3/8 Brass Flat Head Socket Cap Screw gives engineers a brass internal-hex fastener for countersunk holes where a smooth exposed face is part of the design.

Brass may be specified for nonferrous construction, electrical conductivity, distinctive appearance, and general resistance to ordinary atmospheric corrosion. It may be used in instrumentation, laboratory fixtures, and display hardware when the design already calls for a brass countersunk socket fastener.

The 82-degree flat head is intended for a properly prepared countersunk hole; final seating depends on the mating countersink and the surrounding assembly geometry. For this 4-40 thread and 3/8 in. length, review the body diameter, head diameter, head height, hex socket size, and key engagement before approving the fastener for a countersunk assembly. Cold Headers has supplied specialty industrial socket fasteners since 1962 and supports buyers looking for exact brass socket screw sizes.

Technical Highlights

• Material: Brass
• Thread Size: 4-40
• Length: 3/8 in.
• Nominal Body Diameter: 0.112 in.
• Head Diameter: 0.218-0.255 in.
• Head Height: 0.083 in.
• Hex Socket Size: 1/16 in.
• Drive Type: Internal Hex
• Minimum Key Engagement: 0.055 in.

Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.