Value Collection 581521PR Hex Socket Cap Screw 7/16-20 Unf

Product Description

The VALUE COLLECTION 581521PR is a fully threaded hex socket cap screw designed for precision fastening in mechanical, structural, and industrial assemblies. Sized at 7/16-20 UNF with a 7/8 inch length under head, it accepts a 3/8 inch hex drive for high-torque installation with an Allen key or hex bit. The fastener is manufactured from alloy steel and finished with a black oxide coating, which provides mild corrosion resistance and reduces light reflection. It meets ASME/ANSI B18.3 and ASTM A574 standards, making it suitable for applications requiring rated mechanical strength and dimensional consistency. Licensed trades and industrial maintenance technicians are the primary installers of this fastener class.

This cap screw is appropriate for use in equipment assembly, machinery maintenance, hydraulic component mounting, and general mechanical fabrication where a flush or recessed fastener head is required. The 7/16-20 UNF thread pitch is a fine-thread specification, offering improved torque retention and resistance to vibration loosening compared to coarse-thread equivalents. It is well suited to both ferrous and non-ferrous base materials where fine-thread engagement is specified by the original equipment design or engineering requirement. Minimum order quantity is 10 pieces.

Key Features

• 7/16-20 UNF fully threaded profile for consistent fine-thread engagement
• 7/8 inch length under head accommodates standard joint stack depths
• 3/8 inch hex socket drive for use with standard Allen keys or hex bits
• Alloy steel construction meets ASTM A574 mechanical strength requirements
• Black oxide finish provides mild corrosion resistance and low-reflectance appearance
• 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 calling for a 7/16-20 UNF fully threaded alloy steel fastener with a 3/8 inch hex drive.

Installation Notes

Install using a calibrated torque wrench with a 3/8 inch hex bit to achieve specified clamp load without overdriving. Alloy steel fasteners with black oxide finish are not rated for prolonged outdoor or high-humidity exposure without supplemental corrosion protection. Always inspect threads in the mating component before installation and chase with a tap if necessary to ensure full thread engagement. Power down and de-energize any equipment before performing fastener service on live mechanical assemblies.