Value Collection 581634PR Hex Socket Cap Screw 9/16-18 Unf

Product Description

The VALUE COLLECTION 581634PR is a hex socket cap screw designed for high-strength fastening applications across mechanical, industrial, and trade assembly work. This fastener features a 9/16-18 UNF thread size with a 1-1/2 inch length under head and is fully threaded along its entire length. The 7/16 inch hex drive socket requires a standard hex key or Allen driver for installation. Constructed from alloy steel with a black oxide finish, this screw delivers strength and corrosion resistance suited for demanding environments. It meets ASME/ANSI B18.3 and ASTM A574 standards, confirming dimensional accuracy and mechanical performance. Licensed tradespeople and assembly technicians working on equipment, fixtures, and structural connections will find this fastener ready for production use.

This cap screw is suited for use in mechanical equipment assembly, fixture fabrication, machine tooling, and general industrial fastening where fine-thread UNF engagement is required. The 9/16-18 UNF thread pitch provides tighter thread engagement per inch compared to coarse-thread alternatives, making it appropriate for applications requiring vibration resistance or installation into thin-walled tapped holes. The black oxide coating adds mild corrosion protection and reduces light reflection in close-tolerance assemblies. This fastener is commonly installed by millwrights, machinists, HVAC equipment assemblers, and general contractors working with steel components.

Key Features

• 9/16-18 UNF fully threaded profile for maximum thread engagement
• 1-1/2 inch length under head suits medium-depth fastening applications
• 7/16 inch hex socket drive compatible with standard Allen keys and hex bit drivers
• Alloy steel construction meets ASTM A574 mechanical property requirements
• Black oxide finish provides mild corrosion resistance and low-glare appearance
• Conforms to ASME/ANSI B18.3 dimensional standards

Compatibility

Designed as a standard ASME/ANSI B18.3 hex socket cap screw suitable for tapped holes accepting 9/16-18 UNF threads in steel, aluminum, and other compatible base materials.

Installation Notes

Install using a properly sized 7/16 inch hex key or socket bit driver. Ensure the mating tapped hole is clean and free of debris before driving the fastener. Always de-energize and lock out equipment before performing fastener work on live mechanical assemblies. Do not exceed the rated mechanical limits of the fastener; consult engineering references for torque specifications appropriate to the joint material and application.