Value Collection 3180MSF 5/16-18x5 Flat Head Slotted Machine Screw

Product Description

The VALUE COLLECTION 3180MSF is a 5/16-18 x 5-inch flat head slotted machine screw manufactured from steel with a zinc-plated finish. It meets ASME B18.6.3 and SAE J82 dimensional and material standards. The flat head profile sits flush with or below the mating surface when countersunk, making it suitable for applications where a smooth, unobtrusive fastener face is required. The slotted drive accommodates a standard flat-blade screwdriver. Overall length and length under head are both 5 inches. This fastener is used by mechanical contractors, millwrights, electricians, and general maintenance trades in equipment assembly and structural fastening work.

This screw is suited for general-purpose mechanical assemblies in residential, commercial, and light industrial settings. The 5/16-18 coarse thread provides strong thread engagement in steel, aluminum, and other common base materials. The zinc plating offers moderate corrosion resistance in indoor and sheltered environments. No washer is included or integrated. This fastener is sold individually per package with a minimum order quantity of 50 pieces.

Key Features

• 5/16-18 coarse thread for broad material compatibility and reliable clamping force
• 5-inch overall length with full 5-inch length under head for deep fastening applications
• Flat head profile for flush or countersunk installation
• Slotted drive compatible with standard flat-blade screwdrivers
• Zinc-plated steel construction for moderate corrosion resistance in indoor environments
• Conforms to ASME B18.6.3 and SAE J82 standards

Compatibility

Designed as a standard inch-series machine screw for use in any application requiring a 5/16-18 coarse thread flat head slotted fastener per ASME B18.6.3.

Installation Notes

Installation is performed by mechanical, maintenance, or trade personnel using a flat-blade screwdriver or slotted bit of the appropriate size. For countersunk applications, the mating material must be pre-drilled and countersunk to the correct angle to achieve a flush head seating. Avoid over-torquing, which can strip the slot or damage the mating threads. Follow applicable mechanical codes and equipment manufacturer torque guidelines for the specific assembly.