Value Collection 225145PR Shoulder Screw 1/2 in 4140 Alloy Steel

Product Description

The VALUE COLLECTION 225145PR is a hex socket shoulder screw machined from 4140 alloy steel for use in precision mechanical assemblies, jigs, fixtures, and tooling applications. The shoulder measures 0.5 inches in diameter and 4 inches in length, providing a precision-ground bearing surface for pivoting links, bushings, and rotating components. The 3/8-16 UNC threaded section locks the fastener securely into tapped holes. With a 3/4-inch head diameter and a 5/16-inch head height, the cap-style head seats flush and accepts a 1/4-inch hex socket driver. This fastener is suited for machinists, millwrights, and maintenance technicians working on machine tools, dies, and mechanical assemblies.

Shoulder screws of this type are commonly used in manufacturing and industrial maintenance settings where a smooth, precise shaft is needed to guide linear motion, support a bushing, or act as a pivot point. The 4-inch shoulder length accommodates thicker assemblies or stacked components where standard-length shoulder screws fall short. The 4140 alloy steel construction provides high tensile strength and wear resistance for demanding load and cycle applications in both production and maintenance environments.

Key Features

• 0.5-inch precision shoulder diameter for accurate bushing and pivot fits
• 4-inch shoulder length for deep assemblies and stacked component applications
• 3/8-16 UNC thread standard for broad tapped-hole compatibility
• 4140 alloy steel construction for high tensile strength and wear resistance
• 1/4-inch hex socket drive for reliable torque application with standard tooling
• Meets ASME/ANSI B18.3, ASTM F835, and IFI 124 standards

Compatibility

Designed as a standard shoulder screw replacement or new installation fastener for mechanical assemblies, fixtures, jigs, and tooling that require a 0.5-inch shoulder diameter, 4-inch shoulder length, and 3/8-16 UNC threaded end.

Installation Notes

Installation is typically performed by machinists or maintenance technicians using a 1/4-inch hex key or socket driver. Ensure the mating tapped hole is clean and dimensionally correct for 3/8-16 UNC thread engagement before driving the fastener. Power down and de-energize any equipment before servicing assemblies that contain shoulder screws. Do not use impact drivers on hex socket shoulder screws, as this can damage the drive recess or distort the shoulder surface.