Holo-krome 73134 Hex Socket Cap Screw 1/2-20 Unf Alloy Steel

Product Description

The HOLO-KROME 73134 is a hex socket cap screw designed for high-strength fastening applications in mechanical, industrial, and trade assembly work. It features a 1/2-20 UNF thread size with a 1-1/2 inch length under the head and is fully threaded along its entire shank. The screw is machined from alloy steel and finished with a black oxide coating that provides moderate corrosion resistance and reduces surface light reflection. Drive engagement is via a 3/8 inch hex socket. This fastener meets ASME B18.3 and ASTM A574 standards, making it suitable for load-bearing and torque-critical joints where a socket-drive fastener is required.

This screw is used in mechanical assemblies, equipment fabrication, and maintenance work across HVAC, plumbing, electrical, and general industrial applications. The 1/2-20 UNF fine-thread pitch provides greater thread engagement and improved resistance to loosening under vibration compared to coarse-thread equivalents. It is typically installed by machinists, millwrights, or trade technicians using a hex key or socket driver. This item is sold individually but requires a minimum order quantity of 50 units per order.

Key Features

• 1/2-20 UNF fully threaded shank for maximum thread engagement
• 3/8 inch hex socket drive for use with standard hex keys or socket drivers
• Alloy steel construction rated to ASTM A574 for high tensile strength
• Black oxide finish for mild corrosion resistance and low-glare surface
• Conforms to ASME B18.3 dimensional standards
• 1-1/2 inch length under head suits medium-depth fastening applications

Compatibility

Designed as a standard ASME B18.3 hex socket cap screw suitable for any application requiring a 1/2-20 UNF fully threaded fastener with a 3/8 inch hex drive and 1-1/2 inch length under head.

Installation Notes

Installation requires a 3/8 inch hex key or Allen-type socket driver rated for the torque demands of an ASTM A574 alloy steel fastener. Power down or de-energize any equipment before fastener service on live assemblies. Ensure mating threads are clean and free of debris before driving to prevent cross-threading in fine-thread UNF holes. Follow applicable equipment manufacturer torque specifications for the joint material and fastener grade.