Value Collection -33628-2 Hex Socket Cap Screw 5/16-18

Product Description

The VALUE COLLECTION -33628-2 is a partially threaded hex socket cap screw engineered for secure, high-torque fastening in industrial and mechanical assemblies. Sized at 5/16-18 UNC with a 3-3/4 inch length under head, it is driven by a 1/4 inch hex key and manufactured from alloy steel for high tensile strength. The black oxide finish provides moderate corrosion resistance and reduces light reflection in precision assemblies. This fastener meets ASME/ANSI B18.3 and ASTM A574 standards, making it suitable for structural and machine-building applications where consistent clamping force and dimensional accuracy are required.

This screw is commonly used in machine tool fixtures, jigs, structural steel fabrication, and general industrial assembly. The partial threading design allows for precise alignment in clearance holes before full engagement, which is typical in flanged joint assemblies and mechanical housings. It is installed by machinists, millwrights, and maintenance technicians across manufacturing and fabrication environments. Minimum order quantity is 25 pieces per order.

Key Features

• 5/16-18 UNC thread size for standard imperial fastener compatibility
• 3-3/4 inch length under head suits deeper grip and thicker material stacks
• Partially threaded shank allows accurate part alignment in clearance-fit applications
• Alloy steel construction provides high tensile strength for demanding assemblies
• Black oxide coating offers mild corrosion resistance and a low-glare finish
• Meets ASME/ANSI B18.3 and ASTM A574 standards

Compatibility

Designed as a standard 5/16-18 UNC hex socket cap screw for use in any application requiring an ASME/ANSI B18.3-compliant socket head fastener with a 1/4 inch hex drive.

Installation Notes

Installation requires a 1/4 inch hex key or Allen-drive bit; use a calibrated torque wrench when assembly specs require controlled clamping force. Power down and de-energize any equipment before replacing fasteners in live mechanical assemblies. Ensure mating threads are clean and free of debris before installation to avoid cross-threading or false torque readings. Follow applicable ASME or facility-specific torque guidelines for 5/16-18 UNC alloy steel fasteners.