Value Collection 3128MSL 5/16-18 Fillister Slotted Machine Screw

Product Description

The VALUE COLLECTION 3128MSL is a 5/16-18 unified coarse thread machine screw with a fillister head and slotted drive, manufactured from steel with a zinc finish. It measures 1-3/4 inches in length under the head and meets the dimensional and mechanical requirements of ASME B18.6.3 and SAE J82 Grade J82. The fillister head profile features a smaller, taller head diameter compared to a pan head, making it well suited for counterbored holes and applications where head clearance is limited. This screw is a general-purpose industrial fastener used across mechanical assembly, maintenance, and fabrication work.

This screw is appropriate for use in light to medium duty assemblies where a slotted drive and controlled head height are required. Typical applications include panel mounting, equipment enclosures, machinery guards, and fixture assembly in manufacturing or maintenance environments. The zinc finish provides basic corrosion resistance suitable for indoor or controlled-environment use. This is a sold-by-the-piece listing with a minimum order quantity of 100 units, making it appropriate for production or MRO purchasing.

Key Features

• 5/16-18 unified coarse thread for reliable engagement in standard tapped holes
• Fillister head profile suits counterbored holes and tight head-clearance applications
• Slotted drive compatible with standard flat-blade screwdrivers and power bits
• Steel construction with zinc finish for basic corrosion resistance
• Meets ASME B18.6.3 and SAE J82 Grade J82 dimensional and mechanical standards
• Inch measurement system with length measured under the head

Compatibility

Designed as a standard inch-series machine screw for use in any application requiring a 5/16-18 threaded fastener with a fillister head and slotted drive per ASME B18.6.3.

Installation Notes

Installation is performed with a flat-blade screwdriver or slotted power bit sized to the head slot. Ensure the mating thread is tapped or threaded to 5/16-18 UNC specification before installation. Apply appropriate torque for the Grade J82 steel material and joint requirements per applicable engineering or maintenance standards. Do not use this screw in outdoor or high-humidity environments without additional corrosion protection, as zinc plating provides only basic resistance.