Value Collection 581913BR Hex Socket Cap Screw 1-1/4-12 Unf

Product Description

The VALUE COLLECTION 581913BR is a hex socket cap screw designed for high-strength fastening applications in mechanical assemblies, tooling, and industrial equipment. It features a 1-1/4-12 UNF thread — a fine-pitch unified thread that provides increased clamping force and vibration resistance compared to coarse-thread alternatives. The screw measures 3 inches under the head, is fully threaded, and accepts a 7/8-inch hex drive. Constructed from alloy steel with a black oxide coating, it delivers solid corrosion resistance for general industrial use. This fastener meets ASME/ANSI B18.3 and ASTM A574 standards. Machinists, millwrights, and maintenance technicians are the typical installers.

This cap screw is suited for high-load bolted connections where a recessed socket drive is preferred over an external hex. The fine 12-pitch UNF thread is commonly used in applications requiring precise torque control or where the fastener threads into thin-walled or tapped steel components. Typical use cases include fixture mounting, machine bases, hydraulic component mounting, and structural mechanical assemblies in both shop and field environments.

Key Features

• 1-1/4-12 UNF fine-pitch thread for increased clamping load and vibration resistance
• Fully threaded along the 3-inch under-head length
• 7/8-inch internal hex socket drive for high-torque installation
• Alloy steel construction meets ASTM A574 mechanical requirements
• Black oxide finish provides moderate corrosion and abrasion resistance
• Conforms to ASME/ANSI B18.3 dimensional standards

Compatibility

Designed as a standard ASME/ANSI B18.3 hex socket cap screw for use in any application requiring a 1-1/4-12 UNF fully threaded fastener with a 7/8-inch hex drive.

Installation Notes

Install using a calibrated torque wrench with a 7/8-inch hex bit to achieve proper clamping force without overstressing the fastener. Ensure mating threads are clean and free of debris before installation. Power down or de-energize any equipment before accessing fastened assemblies on live machinery. Follow applicable industry or equipment manufacturer torque specifications for this thread size and grade.