Holo-krome 72130 Hex Socket Cap Screw 5/16-18 Unc

Product Description

The HOLO-KROME 72130 is a hex socket cap screw designed for high-strength fastening in mechanical assemblies, maintenance applications, and equipment fabrication. It features a 5/16-18 UNC thread and a 1-1/4 inch length under head with full threading along the entire shank. The 1/4 inch hex drive socket accepts a standard Allen or hex key for installation in confined spaces where a wrench cannot reach. Constructed from alloy steel with a black oxide finish, the fastener offers solid tensile strength and moderate corrosion resistance in controlled environments. This screw meets ASME B18.3 and ASTM A574 dimensional and mechanical standards.

This fastener is suited for general industrial and mechanical applications where a flush or low-profile cap head is required. Common uses include securing machine components, jigs, fixtures, brackets, and fabricated assemblies. It is appropriate for use in manufacturing facilities, maintenance and repair operations, and trade shop environments. Machinists, millwrights, industrial mechanics, and experienced trade professionals typically source and install this type of fastener. It ships in a package quantity of one unit with a minimum order quantity of 100 pieces.

Key Features

• 5/16-18 UNC thread form for standard inch-series fastening applications
• Fully threaded shank provides maximum thread engagement along the 1-1/4 inch under-head length
• 1/4 inch hex socket drive for use with Allen keys or hex drivers in tight clearances
• Alloy steel construction meets ASTM A574 mechanical requirements for socket cap screws
• Black oxide finish provides a clean appearance and light surface protection in dry or lightly oiled environments
• Conforms to ASME B18.3 dimensional standards for hex socket head cap screws

Compatibility

Designed as an OEM-style and replacement fastener for standard inch-series mechanical assemblies requiring a 5/16-18 UNC hex socket cap screw with a 1-1/4 inch under-head length.

Installation Notes

Installation requires a 1/4 inch hex key or Allen driver; use of a calibrated torque wrench is recommended to avoid over-torquing alloy steel fasteners in tapped holes. Always ensure the mating threads are clean and free of debris before installation. Black oxide fasteners are not intended for prolonged exposure to moisture or corrosive environments without additional protective lubrication. Industrial mechanics and maintenance technicians should follow applicable equipment manufacturer torque guidelines and safety lockout procedures before working on any assembly.