Value Collection BDNA-D30043 Hex Cap Screw 5/16-18 X 5.5in

Product Description

The VALUE COLLECTION BDNA-D30043 is a Grade 5 steel hex head cap screw sized 5/16-18 x 5-1/2 inches, manufactured to ASME B18.2.1 standards. It features a Unified National Coarse (UNC) thread form with partial threading along the shank and a zinc-plated finish for basic corrosion resistance. This fastener is suited for general mechanical assembly, structural connections, and equipment fabrication where a standard hex-drive cap screw is required. Machinists, millwrights, pipefitters, and general contractors commonly stock this size for maintenance and repair work across a broad range of applications.

This screw is appropriate for use in residential and commercial construction, HVAC equipment mounting, light structural fabrication, and general mechanical assembly. The 5-1/2 inch length under head makes it suitable for applications requiring fastening through thicker material stacks or spacers. The 5/16-18 UNC thread engages standard tapped holes and hex nuts of matching thread specification. Installation is performed with standard hand or power tools using a hex wrench or socket.

Key Features

• Grade 5 steel construction for reliable tensile and proof load performance in general-purpose fastening
• 5/16-18 UNC thread form compatible with standard tapped holes and nuts of matching specification
• 5-1/2 inch length under head accommodates thicker material stacks and spacer applications
• Partial threading preserves a smooth shank section for shear-load and alignment applications
• Zinc-plated finish provides basic corrosion protection in dry and mildly humid environments
• Manufactured to ASME B18.2.1 dimensional standards for consistent fit and interchangeability

Compatibility

Designed as a standard-dimension replacement or stock fastener for any application requiring a 5/16-18 UNC hex head cap screw with a 5-1/2 inch length under head, conforming to ASME B18.2.1.

Installation Notes

Installation is performed by qualified mechanics, millwrights, or tradespeople using a standard hex socket or wrench sized for a 5/16-inch hex head cap screw. Always ensure the mating tapped hole or nut is clean and free of debris before installation. Follow applicable torque specifications from the equipment manufacturer or relevant fastener standards for Grade 5 hardware. Do not overtighten, as this may yield the fastener or damage the mating threads.