Holo-krome 73142 Hex Socket Cap Screw 1/2-20 Unf Alloy Steel

Product Description

The HOLO-KROME 73142 is a partially threaded hex socket cap screw designed for high-strength mechanical fastening in demanding trade and industrial applications. It features a 1/2-20 UNF thread size, a 2.5-inch length under head, and a 3/8-inch hex drive. Manufactured from alloy steel with a black oxide finish, this screw meets ASME B18.3 and ASTM A574 standards, making it suitable for applications requiring controlled torque and reliable clamping force. It is installed using a 3/8-inch hex key or socket driver.

This cap screw is used in mechanical assemblies, machinery maintenance, and structural fastening where a flush or low-profile socket head is required. The 1/2-20 UNF fine thread pitch provides tighter thread engagement and is well-suited for applications requiring precise clamping or where vibration resistance is a factor. Typical installers include millwrights, maintenance mechanics, and industrial technicians working on equipment assemblies, jigs, fixtures, and fabricated metal structures.

Key Features

• 1/2-20 UNF fine thread for precise clamping and vibration resistance
• 2.5-inch length under head with partial threading for strong grip in clearance-hole applications
• 3/8-inch hex socket drive for use with standard hex keys or socket drivers
• Alloy steel construction meets ASTM A574 high-strength fastener requirements
• Black oxide finish provides mild corrosion resistance and reduces light glare on finished assemblies
• Conforms to ASME B18.3 dimensional standards for socket cap screws

Compatibility

Designed as an OEM-style replacement or standard-service hex socket cap screw for mechanical assemblies requiring a 1/2-20 UNF partially threaded cap screw per ASME B18.3.

Installation Notes

Installation should be performed by qualified mechanics or technicians familiar with fastener torque requirements for alloy steel cap screws. De-energize and lock out all equipment before removing or replacing fasteners in active machinery. Use a properly sized 3/8-inch hex key or socket to avoid rounding the drive socket. Do not substitute a lower-grade fastener in applications specified for ASTM A574 high-strength hardware.