Holo-krome 65016 Button Socket Cap Screw 1/4-28 3/8in

Product Description

The HOLO-KROME 65016 is a button socket cap screw designed for applications requiring a low-profile, high-strength fastener with a hex socket drive. Manufactured from alloy steel with a black oxide finish, this screw meets ANSI/ASME B18.3 and ASTM F835 standards. It features a 1/4-28 UNF thread form with a Class 3A fit, providing close dimensional tolerances for precision assemblies. The 5/32-inch hex socket drive accepts standard hex keys. Hardness is rated at 38 HRC, making it suited for moderate to high load-bearing joints in tight-clearance installations. Fully threaded along its 3/8-inch length under head, it is commonly installed by machinists, millwrights, and maintenance technicians.

The HOLO-KROME 65016 is used in mechanical assemblies, machine guarding, fixtures, and equipment frames where a flush or near-flush fastener head is required. The button head profile reduces snag points and distributes clamping load over a wider bearing surface than a standard socket head. The black oxide finish provides mild corrosion resistance suitable for interior or controlled-environment use. This screw ships in multiples of 100 units per order.

Key Features

• Button head profile with 0.437-inch head diameter for low-profile, wide-bearing installations
• 1/4-28 UNF fully threaded, Class 3A fit for precise thread engagement
• Alloy steel construction rated at 38 HRC hardness
• Black oxide finish for mild corrosion resistance in controlled environments
• 5/32-inch hex socket drive compatible with standard hex keys
• Meets ANSI/ASME B18.3 and ASTM F835 fastener standards

Compatibility

Designed as a standard 1/4-28 UNF button socket cap screw conforming to ANSI/ASME B18.3, suitable for use in any application requiring this thread size, head style, and drive type.

Installation Notes

Install and remove using a 5/32-inch hex key or hex bit driver. Power down and de-energize any equipment before accessing fastener locations in live machinery. Black oxide finish does not provide heavy corrosion protection - avoid prolonged exposure to moisture or corrosive environments without additional coating. Follow applicable industry or equipment manufacturer torque guidelines for 1/4-28 fasteners in the specific joint material.