Holo-krome 64006 Button Socket Cap Screw 4-40 Alloy Steel

Product Description

The HOLO-KROME 64006 is a button socket cap screw designed for applications requiring a low-profile head and high tensile strength in a compact fastener. It features a 4-40 UNC thread and a 1/16-inch hex socket drive, accepting a standard hex key for installation and removal. The alloy steel construction with black oxide finish provides corrosion resistance in moderate environments. Fully threaded along the 1/2-inch length under head, it meets ANSI/ASME B18.3 and ASTM F835 standards with a 3A thread fit class and 38 HRC hardness rating. Machinists, assembly technicians, and mechanical contractors install this type of fastener in precision equipment, panels, and enclosures.

This screw is suited for light mechanical assemblies, electronic enclosures, jigs, fixtures, and machine components where a flush or recessed fastener profile is required. The button head style distributes clamping load over a wider surface area compared to a standard socket cap, making it a common choice for thin panels and soft substrates. The black oxide finish blends into finished metalwork and provides mild lubricity during installation. This fastener is sold in multiples of 100 per order with a package quantity of 1.

Key Features

• 4-40 UNC fully threaded, 3A thread fit class for precise engagement
• 1/2-inch length under head with 1/16-inch hex socket drive
• Alloy steel construction rated at 38 HRC hardness
• Black oxide finish for mild corrosion resistance and reduced glare
• Button head profile reduces snag risk and distributes load on thin materials
• Meets ANSI/ASME B18.3 and ASTM F835 fastener standards

Compatibility

Designed as an OEM-style replacement or standard-fit fastener for assemblies specifying a 4-40 UNC button socket cap screw per ANSI/ASME B18.3 with a 3A thread class.

Installation Notes

Installation requires a 1/16-inch hex key or driver bit; confirm the correct drive size before applying torque to avoid socket rounding. Power down or de-energize any equipment before accessing fastener locations inside electrical or mechanical enclosures. Right-hand thread direction applies - turn clockwise to tighten. Follow applicable assembly and torque specifications from the equipment manufacturer or relevant industry standards.