Value Collection 3148MSL Machine Screw 5/16-18 X 3 in

Product Description

The VALUE COLLECTION 3148MSL is a 5/16-18 x 3-inch fillister head machine screw with a slotted drive, manufactured from steel with a zinc finish. It conforms to ASME B18.6.3 and SAE J82 standards, making it a reliable choice for general mechanical assembly applications. The fillister head profile offers a smaller outer diameter and taller head height compared to a pan head, which suits installations where lateral clearance is limited or a deep slot engagement is needed. This fastener ships without an integrated washer. Licensed trade mechanics, millwrights, pipefitters, and maintenance technicians commonly source this screw for equipment reassembly and structural fastening tasks.

This screw is suited for use in light to medium-duty mechanical assemblies, equipment enclosures, and general industrial maintenance applications where a 5/16-18 UNC thread is specified. The 3-inch length under head provides adequate grip range for multi-layer material stacks or thicker structural members. The zinc finish provides a base level of corrosion resistance appropriate for indoor and sheltered environments. Sold individually per package; minimum order quantity is 5 units.

Key Features

• 5/16-18 UNC thread with 3-inch length under head for solid engagement in thicker assemblies
• Fillister head profile provides reduced outer diameter and deep slotted recess for secure drive engagement
• Slotted drive compatible with standard flat-blade screwdrivers and manual bit drivers
• Steel construction with zinc finish for base corrosion resistance in dry or sheltered environments
• Conforms to ASME B18.6.3 and SAE J82 fastener standards
• No integrated washer style — clean seating on flat surfaces without a flange footprint

Compatibility

Designed as a standard 5/16-18 UNC fillister head machine screw per ASME B18.6.3, suitable as a replacement or stock fastener in any application calling for this thread size, head type, and drive style.

Installation Notes

Installation requires a flat-blade screwdriver or slotted bit sized for a 5/16-inch fillister head. Ensure the mating tapped hole or nut is clean and free of debris before threading to avoid cross-threading or drive slot damage. Follow applicable torque guidelines from the equipment manufacturer or relevant ASME standards for Grade J82 steel fasteners. Do not use impact drivers without appropriate torque control, as slotted drive recesses are susceptible to cam-out under high torque.