Value Collection 209055B Hex Head Cap Screw 5/16-18 X 2-1/4 in

Product Description

The VALUE COLLECTION 209055B is a hex head cap screw sized at 5/16-18 x 2-1/4 inches, manufactured from 18-8 stainless steel with an uncoated finish and partial threading. The 5/16-18 designation indicates a 5/16-inch nominal diameter with 18 threads per inch on a Unified National Coarse (UNC) thread form. Partial threading leaves a smooth shank section under the head, which provides clamping strength and helps resist fastener loosening under vibration. Installers in HVAC, plumbing, electrical, and general mechanical trades rely on 18-8 stainless steel fasteners where corrosion resistance is a priority.

This fastener suits applications in light commercial and residential settings where exposure to moisture, mild chemicals, or outdoor conditions makes carbon steel fasteners unsuitable. Typical installations include equipment panels, pipe hangers, electrical enclosures, mechanical supports, and general structural connections. The UNC thread form is the standard inch-series coarse thread, compatible with the widest range of tapped holes, threaded inserts, and hex nuts used in trade applications. These screws are sold individually with a minimum order quantity of 100 units.

Key Features

• 5/16-18 UNC thread form for broad compatibility with standard tapped holes and hardware
• 2-1/4-inch length under head, measured from the bearing face to the end of the fastener
• 18-8 stainless steel construction provides corrosion resistance in wet or chemically exposed environments
• Partial threading preserves a smooth shank section that improves clamping and shear resistance
• Uncoated finish suitable for use with standard stainless steel nuts and hardware
• Inch system of measurement; conforms to UNC thread standard

Compatibility

Designed for use with standard 5/16-18 UNC tapped holes, hex nuts, and threaded inserts in inch-standard fastener applications across HVAC, plumbing, electrical, and general mechanical assemblies.

Installation Notes

Install using a standard hex wrench or socket driver sized for the fastener head. Ensure the mating tapped hole or nut matches the 5/16-18 UNC thread specification before installation to avoid cross-threading. When fastening stainless steel hardware, apply an appropriate anti-seize compound to reduce the risk of galling between mating stainless surfaces. Torque to the value specified by the equipment manufacturer or applicable code for the fastener size and joint type.