Holo-krome 73130 Hex Socket Cap Screw 1/2-20 Unf

Product Description

The HOLO-KROME 73130 is a fully threaded hex socket cap screw manufactured from alloy steel with a black oxide finish. It carries a 1/2-20 UNF thread size and measures 1 inch in length under the head. Drive engagement is through a 3/8 inch hex socket. The black oxide coating provides mild corrosion resistance and reduces light reflection on the fastener surface. This screw meets ASME B18.3 and ASTM A574 standards, making it suitable for high-strength bolted joint applications in mechanical, HVAC equipment, and general industrial assemblies. Installation requires a 3/8 inch hex key or socket driver.

This fastener is used in a wide range of trade and industrial applications where a high-strength, flush or low-profile cap screw is required. Common uses include securing mechanical components in HVAC equipment, pump housings, electrical enclosures, and structural assemblies. The fine 1/2-20 UNF thread pitch provides stronger thread engagement and improved resistance to vibration loosening compared to coarse thread equivalents, making it a preferred choice in precision or vibration-prone assemblies.

Key Features

• 1/2-20 UNF fully threaded for maximum thread engagement along the full shank length
• 1 inch length under head suits medium-depth fastening applications
• 3/8 inch hex socket drive for standard hex key or socket wrench installation
• Alloy steel construction meets ASTM A574 high-strength fastener requirements
• Black oxide finish provides mild corrosion resistance and a low-reflectance surface
• Conforms to ASME B18.3 dimensional standard for hex socket cap screws

Compatibility

Designed as an OEM-style replacement or standard hex socket cap screw for applications requiring a 1/2-20 UNF, 1 inch length under head, alloy steel fastener per ASME B18.3 and ASTM A574.

Installation Notes

Installation should be performed by a qualified mechanic or technician using a 3/8 inch hex key or socket drive tool. De-energize and lock out any equipment before replacing or installing fasteners in live assemblies. Do not exceed the torque rating appropriate for the fastener grade and joint material. Inspect threads on both the screw and mating component for damage before assembly.