Value Collection 701156PR Button Socket Cap Screw 5/16-18

Product Description

The VALUE COLLECTION 701156PR is a button socket cap screw designed for mechanical assemblies where a low-profile head and high clamping strength are required. It features a 5/16-18 UNC thread with a 3-inch length under the head, driven by a 3/16-inch hex socket. Constructed from alloy steel with a black oxide finish, this fastener delivers hardness in the 36-43 HRC range. The black oxide coating provides moderate corrosion resistance and reduces light reflection, making it a common choice in machinery, fixtures, and fabricated assemblies. Fully threaded with a right-hand thread direction and a Class 3A thread fit.

This screw is suited for use in general industrial, mechanical, and structural assembly applications where a button-head profile is needed to clear adjacent components or provide a flush, snag-free surface. It is appropriate for both OEM production and field service work. The 5/16-18 thread size is a standard UNC fastener used across a broad range of equipment in manufacturing, maintenance, and fabrication environments. Installation requires a 3/16-inch hex socket driver or Allen key.

Key Features

• Button head profile keeps fastener height low at 0.166 inches, reducing interference with adjacent parts
• Alloy steel construction with 36-43 HRC hardness for high tensile and shear strength
• Black oxide finish provides mild corrosion resistance and a non-reflective surface
• Fully threaded 5/16-18 UNC right-hand thread with Class 3A fit for precise engagement
• Driven by a 3/16-inch hex socket for reliable torque transfer
• Meets ANSI/ASME B18.3 and ASTM F835 fastener standards

Compatibility

Designed as a standard UNC replacement or production fastener for assemblies specifying a 5/16-18 x 3-inch button socket cap screw per ANSI/ASME B18.3 and ASTM F835.

Installation Notes

Installation is typically performed by machinists, millwrights, or maintenance technicians using a 3/16-inch hex key or socket driver. Ensure mating threads are clean and free of debris before installation. Follow applicable torque specifications from the equipment manufacturer or relevant engineering standards for 5/16-18 alloy steel fasteners. Avoid cross-threading by hand-starting the screw before applying torque.