Value Collection 93051 Button Socket Cap Screw 4-40 X 5/16

Product Description

The VALUE COLLECTION 93051 is a button socket cap screw designed for precision fastening applications where a low-profile head and high corrosion resistance are required. Threaded 4-40 UNC with a 5/16 inch length under head, the screw is fully threaded and drives with a 1/16 inch hex socket. Made from 18-8 stainless steel with a bright uncoated finish, it meets ANSI/ASME B18.3 and ASTM F837 standards. Machinists, maintenance technicians, and assembly professionals install these in light-duty mechanical assemblies, electronics enclosures, and instrumentation hardware.

This fastener is suited for light mechanical assemblies requiring a flush, rounded head profile with minimal protrusion. The 4-40 UNC thread standard is common in small-format instrumentation, electronics chassis, and precision mechanical devices. The 18-8 stainless steel construction handles mildly corrosive environments including indoor industrial and marine-adjacent settings. Right-hand thread direction and a Class 3A thread fit make it compatible with standard 4-40 tapped holes across a wide range of materials including aluminum, steel, and thermoplastics.

Key Features

• Button head profile provides low clearance and a smooth, rounded top surface
• 18-8 stainless steel construction resists corrosion in mildly aggressive environments
• Fully threaded 4-40 UNC at 5/16 inch length under head for maximum thread engagement in thin materials
• 1/16 inch hex socket drive compatible with standard ball-end hex keys and hex bits
• Class 3A thread fit ensures consistent engagement with standard tapped holes
• Meets ANSI/ASME B18.3 and ASTM F837 fastener standards

Compatibility

Designed as an OEM-style replacement or standard-use fastener for any application requiring a 4-40 UNC button socket cap screw with a 5/16 inch length under head.

Installation Notes

Install using a calibrated 1/16 inch hex key or hex bit driver. Ensure the mating tapped hole meets 4-40 UNC Class 3B tolerance before driving. Do not exceed the torque capacity of the 18-8 stainless steel material, as stainless fasteners at small diameters are susceptible to galling — apply an appropriate anti-seize compound when driving into stainless or aluminum. Power down any equipment before accessing fastened panels or enclosures.