Value Collection MSRI03105500-050BX Machine Screw 5/16-18

Product Description

The VALUE COLLECTION MSRI03105500-050BX is a 5/16-18 x 5.5 inch round head, slotted machine screw manufactured from Grade 2 alloy steel with a zinc-plated finish. The round head profile provides a low-profile bearing surface, and the slotted drive accommodates standard flat-blade tools. The zinc coating delivers basic corrosion resistance suited to general indoor and light-duty industrial applications. These screws follow the Unified National Coarse (UNC) thread standard at 5/16-18, making them a common fastener size across mechanical assemblies, equipment frames, and enclosures. They are sold in a minimum order of 50 pieces per box and are handled by general contractors, millwrights, and maintenance technicians.

These machine screws are appropriate for use in general mechanical assembly, equipment mounting, and structural fastening where a UNC coarse-thread fastener is specified. The 5.5 inch length under head accommodates thicker material stacks, spacers, and through-bolt applications. The zinc-plated alloy steel construction is suitable for dry indoor environments and light-duty service conditions where moderate tensile strength is required. Typical installation scenarios include machinery frames, enclosure panels, and general fabrication work.

Key Features

• 5/16-18 UNC coarse thread for broad compatibility with standard tapped holes and hex nuts
• 5.5 inch length under head accommodates thicker material stacks and spacer applications
• Round head profile provides a low-profile clamping surface with slotted flat-blade drive
• Grade 2 alloy steel construction delivers adequate tensile strength for general-purpose fastening
• Zinc-plated finish provides basic corrosion resistance for dry indoor use
• Sold in boxes of 50 to meet minimum order and job-site quantity needs

Compatibility

Designed for use in standard 5/16-18 UNC tapped holes and with matching hex nuts or threaded inserts in general mechanical and structural assembly applications.

Installation Notes

Installation is performed with a standard flat-blade screwdriver or slotted bit driver sized to the head recess. Ensure the mating tapped hole or nut is clean and free of debris before driving. Do not overtighten slotted fasteners, as the drive recess is susceptible to cam-out under excessive torque. Follow applicable fastener standards and project specifications for proper clamp load requirements.