Value Collection 581433PR Hex Socket Cap Screw 5/16-18 Unc

Product Description

The VALUE COLLECTION 581433PR is a hex socket cap screw designed for high-strength fastening applications in mechanical, industrial, and trade assembly work. Sized at 5/16-18 UNC with a 4.5-inch length under head, it accepts a 1/4-inch hex drive and is partially threaded for secure clamping against a mating surface. Manufactured from alloy steel with a black oxide finish, this screw delivers corrosion resistance and surface hardness suitable for demanding service environments. It conforms to ASME/ANSI B18.3 and ASTM A574 standards, making it appropriate where code-compliant fasteners are specified.

This screw is used across a wide range of applications including equipment assembly, machinery mounting, structural bracketing, and HVAC or mechanical system component fastening. The partially threaded shank provides a stronger grip in through-bolt configurations and is well suited for joining thick material sections where full threading would reduce clamping force. Maintenance technicians, millwrights, pipefitters, and general mechanical contractors commonly install this type of fastener.

Key Features

• 5/16-18 UNC thread size for broad compatibility with standard tapped holes
• 4.5-inch length under head for deep through-bolt or thick-material applications
• Partially threaded shank for improved clamping strength
• 1/4-inch hex socket drive for standard Allen wrench or hex bit installation
• Alloy steel construction with black oxide coating for corrosion and wear resistance
• Meets ASME/ANSI B18.3 and ASTM A574 standards for dimensional and mechanical compliance

Compatibility

Designed as an OEM-style replacement or direct-fit fastener for any application requiring a 5/16-18 UNC partially threaded hex socket cap screw with a 4.5-inch length under head.

Installation Notes

Installation is performed using a 1/4-inch hex key or socket bit driver. Ensure the receiving hole is properly tapped to 5/16-18 UNC before driving the screw. Apply appropriate thread lubricant or thread-locking compound as required by the application. Always de-energize or depressurize any system before replacing or installing fasteners on live equipment.