Holo-krome 64078 Button Socket Cap Screw 1/2-13

Product Description

The HOLO-KROME 64078 is a button socket cap screw designed for applications requiring a low-profile fastener with a high-strength alloy steel construction. This fully threaded fastener features a 1/2-13 UNC thread size and measures 1.25 inches in length under the head. Driven with a 5/16-inch hex socket, it meets ANSI/ASME B18.3 and ASTM F835 standards. A black oxide finish provides mild corrosion resistance and reduces light reflection in finished assemblies. With a hardness rating of 38 HRC and a 3A thread fit class, it delivers consistent clamping force in precision mechanical and structural installations.

This button cap screw is suited for mechanical assemblies, machine frames, enclosures, and equipment panels where a smooth, rounded head profile is needed to clear adjacent components or prevent snagging. The UNC right-hand thread and 3A fit class make it compatible with standard tapped holes in steel, aluminum, and similar substrates. It is commonly installed by millwrights, maintenance technicians, and mechanical contractors working on industrial machinery, conveyor systems, and fabricated steel structures.

Key Features

• Low-profile button head with 0.875-inch head diameter and 0.265-inch head height minimizes protrusion
• Alloy steel construction with 38 HRC hardness for high tensile strength in demanding applications
• Black oxide finish for mild corrosion resistance and a clean appearance
• 5/16-inch hex socket drive for use with standard Allen keys and socket bits
• Fully threaded 1/2-13 UNC 3A right-hand thread meets ANSI/ASME B18.3 and ASTM F835 standards

Compatibility

Designed as a direct-fit fastener for standard 1/2-13 UNC tapped holes in industrial, mechanical, and fabrication applications per ANSI/ASME B18.3.

Installation Notes

Installation should be performed by qualified mechanical technicians or tradespeople using a calibrated torque wrench and the correct 5/16-inch hex key or socket bit. Ensure the tapped hole is clean and free of debris before installation. Do not exceed the rated torque capacity of the mating material, particularly when threading into aluminum or softer substrates. Minimum order quantity for this fastener is 25 pieces.