Value Collection 225181BR Shoulder Screw 5/8 in 4140 Alloy Steel

Product Description

The VALUE COLLECTION 225181BR is a hex socket shoulder screw machined from 4140 alloy steel, designed for precision locating, pivoting, and bearing-retention applications in mechanical assemblies. The shoulder measures 5/8 inch in diameter and 3 inches in length, providing a ground, close-tolerance surface that acts as a journal, pivot pin, or alignment boss. The 1/2-13 UNC threaded section locks the fastener into a tapped hole, clamping the assembly while the shoulder remains free to allow rotation or movement of mating components. Licensed mechanics, tool-and-die technicians, and industrial maintenance personnel typically install this fastener in jigs, fixtures, linkages, and precision machinery.

This shoulder screw is suited for moderate-to-heavy-duty mechanical assemblies where a hardened, close-tolerance pin is required to locate or support rotating or sliding components. The 4140 alloy steel construction provides good tensile strength and wear resistance, making it appropriate for use in machine guarding, cam followers, drill jigs, and general industrial linkage applications. The 7/8 inch head diameter and 3/8 inch head height allow seating against standard counterbores without requiring a custom tool seat.

Key Features

• 5/8 inch shoulder diameter provides a precision journal surface for rotating or sliding mating parts
• 3 inch shoulder length accommodates thicker workpieces and stacked assembly layers
• 1/2-13 UNC thread for reliable pull-down into standard tapped holes
• 4140 alloy steel construction for strength and wear resistance under cyclic loading
• 5/16 inch hex socket drive for installation with a standard hex key or Allen-type wrench
• Meets ASME/ANSI B18.3, ASTM F835, and IFI 124 dimensional and material standards

Compatibility

Designed as a standard shoulder screw replacement for mechanical assemblies requiring a 5/8 inch shoulder diameter, 3 inch shoulder length, and 1/2-13 UNC thread in applications specifying 4140 alloy steel per ASME/ANSI B18.3, ASTM F835, or IFI 124.

Installation Notes

Installation is performed with a 5/16 inch hex key. Ensure the mating tapped hole is clean, undamaged, and sized for a 1/2-13 UNC thread before driving the fastener. Power down and lock out all energy sources before replacing shoulder screws in live mechanical assemblies. Do not exceed the torque range appropriate for the tapped material; consult engineering references or fastener manufacturer torque tables for 1/2-13 UNC alloy steel fasteners.