Value Collection 3156MST 5/16-18 Truss Head Slotted Machine Screw

Product Description

The VALUE COLLECTION 3156MST is a 5/16-18 unified coarse thread machine screw with a truss head and slotted drive, measuring 3.5 inches under the head. Manufactured from steel with a zinc finish, it meets ASME B18.6.3 and SAE J82 standards. The truss head profile features a wide, low-profile head that distributes clamping load across a larger bearing surface than a standard pan or round head, making it well suited for thin sheet metal, plastic panels, and light structural assemblies. This fastener is sold in a minimum order quantity of 10 pieces.

This screw is used across a wide range of trade and industrial applications where a low-profile head and broad bearing surface are needed. Common installations include HVAC sheet metal enclosures, electrical panel covers, equipment access doors, and light structural connections. The zinc finish provides basic corrosion resistance suitable for dry indoor environments. A licensed technician or journeyman mechanic would typically install this fastener as part of equipment assembly or field service work.

Key Features

• 5/16-18 unified coarse thread for broad fastener compatibility
• 3.5 inch length under head accommodates thicker stack assemblies
• Truss head distributes load over a wide bearing surface
• Slotted drive works with standard flat-blade screwdrivers
• Zinc finish provides basic indoor corrosion resistance
• Meets ASME B18.6.3 and SAE J82 fastener standards

Compatibility

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

Installation Notes

Install with a flat-blade screwdriver or appropriate bit driver sized for the slotted head. De-energize and lock out any electrical or mechanical equipment before replacing fasteners on live assemblies. Do not over-torque slotted drives, as the slot geometry is more susceptible to cam-out than hex or square drives. Follow applicable NEC or equipment manufacturer guidelines when fastening electrical enclosure covers.