Value Collection 2-SFM-31C-300 Flat Head Machine Screw

Product Description

The VALUE COLLECTION 2-SFM-31C-300 is a 5/16-18 x 3-inch flat head slotted machine screw manufactured from Grade 316 stainless steel with a bright, uncoated finish. The flat head profile sits flush with mating surfaces upon installation, making it well suited for applications where a low-profile fastener is required. Grade 316 stainless steel provides strong resistance to corrosion and oxidation, including in marine, chemical, and high-moisture environments. This screw is sold individually and is appropriate for use by millwrights, pipefitters, electricians, HVAC technicians, and other tradespeople who require corrosion-resistant fasteners in demanding service conditions.

This fastener is used in a wide range of industrial and mechanical assembly applications where a countersunk, flush-mounted connection is needed. The 5/16-18 Unified National Coarse thread pattern is a standard size compatible with commonly available hardware, panels, equipment frames, and enclosures. The slotted drive accommodates a flat-blade screwdriver, which is practical in tight spaces or where specialty drive tools are not available. Typical installation scenarios include equipment mounting, enclosure assembly, and structural fastening in corrosive or wet environments.

Key Features

• Grade 316 stainless steel construction for superior corrosion resistance in harsh or marine environments
• Flat head profile allows flush seating with the mating surface
• Slotted drive compatible with standard flat-blade screwdrivers
• 5/16-18 UNC thread pattern — a widely used coarse-thread standard
• 3-inch length under head provides substantial thread engagement for deep or stacked material fastening
• Bright, uncoated finish — no additional surface treatment that could affect dimensional tolerance or chemical compatibility

Compatibility

Designed as an OEM-style replacement or general-use fastener for applications requiring a 5/16-18 x 3-inch flat head slotted machine screw in Grade 316 stainless steel.

Installation Notes

Installation is performed with a flat-blade screwdriver sized appropriately for the slotted drive. Ensure the mating material is pre-drilled and tapped to 5/16-18 UNC specification before driving the screw. Power down or de-energize any electrical enclosure or equipment before fastener service. Do not overtighten stainless steel fasteners, as galling can occur — applying an appropriate anti-seize compound to the threads is a common field practice when working with stainless fasteners.