Value Collection 30740 Hex Head Cap Screw 5/16-18 X 3/4 in

Product Description

The VALUE COLLECTION 30740 is a 5/16-18 x 3/4 inch hex head cap screw machined from silicon bronze, intended for fastening applications where corrosion resistance and conductivity matter. The unified coarse thread (UNC) pattern provides reliable engagement across standard tapped holes and nuts. With a 1/2 inch hex drive and a 3/4 inch length under head, this fastener is sized for light- to medium-duty assemblies in trade and industrial environments. Electricians, plumbers, and mechanical contractors commonly use silicon bronze fasteners where galvanic compatibility or marine-adjacent conditions are a concern.

This screw suits applications in plumbing, electrical, HVAC, and general mechanical assemblies where steel fasteners would be susceptible to corrosion. Silicon bronze is a copper-based alloy with strong resistance to saltwater, humidity, and many chemicals, making it a practical choice for outdoor enclosures, wet locations, pool equipment, and coastal installations. It is sold in packages of 25, making it practical for service trucks and job-site replenishment.

Key Features

• 5/16-18 UNC thread for compatibility with standard tapped holes and hex nuts
• 3/4 inch length under head suits medium-thickness panel and bracket fastening
• Silicon bronze construction provides corrosion resistance in wet and coastal environments
• 1/2 inch hex drive works with standard box, open-end, and socket wrenches
• Sold in a 25-piece package for convenient stock replenishment

Compatibility

Designed as a standard inch-series UNC hex head cap screw compatible with any 5/16-18 tapped hole or nut in general mechanical, electrical, plumbing, and HVAC assembly applications.

Installation Notes

Install with a 1/2 inch wrench or socket driver. Ensure mating threads are clean and free of debris before driving. Silicon bronze is softer than steel — avoid over-torquing, which can strip threads or shear the fastener head. When used in electrical enclosures or wet locations, follow applicable NEC or IPC guidelines for fastener material selection.