Value Collection -33626-1 Hex Socket Cap Screw 5/16-18

Product Description

The VALUE COLLECTION -33626-1 is a partially threaded hex socket cap screw designed for secure mechanical fastening in assemblies that require a recessed drive and high clamping strength. Sized at 5/16-18 UNC with a 2.75-inch length under head, this screw accepts a 1/4-inch hex (Allen) drive. It is manufactured from alloy steel and finished with a black oxide coating, which provides mild corrosion resistance and a low-reflectance surface. This fastener is suited for general industrial, machinery, and structural assembly work performed by millwrights, maintenance technicians, and mechanical contractors.

This screw is appropriate for applications where a socket head profile is required to clear surrounding material or where torque demands exceed the capacity of standard fastener heads. The partial thread design allows for precise clamping without thread engagement across the full grip length, making it well suited for through-hole and clearance-fit applications in steel and alloy assemblies. It conforms to ASME/ANSI B18.3 and ASTM A574 standards.

Key Features

• 5/16-18 UNC thread size for standard inch-series assembly
• 2.75-inch length under head with partial threading for clearance-fit installations
• 1/4-inch hex socket drive for use with standard Allen wrenches or hex bit drivers
• Alloy steel construction meets ASTM A574 mechanical requirements
• Black oxide finish provides mild corrosion resistance and reduces surface reflectance
• Conforms to ASME/ANSI B18.3 dimensional standards

Compatibility

Designed as a standard ASME/ANSI B18.3 hex socket cap screw for use in inch-series mechanical assemblies requiring a 5/16-18 UNC partially threaded fastener.

Installation Notes

Installation is performed with a 1/4-inch hex key or socket bit driver; verify bit engagement before applying torque to avoid drive recess damage. De-energize and lock out any equipment before fastener removal or installation on live machinery per applicable safety procedures. Do not substitute a metric hex key, as dimensional differences will damage the drive recess. Thread engagement depth and torque should follow the assembly drawing or applicable engineering specifications for the joint material.