Value Collection 225073PR Shoulder Screw 3/8 in 4140 Alloy Steel

Product Description

The VALUE COLLECTION 225073PR is a hex socket shoulder screw machined from 4140 alloy steel, designed for precision fastening applications where a hardened, close-tolerance shoulder is required. The screw features a 3/8 inch shoulder diameter and a 2 inch shoulder length, providing a smooth bearing surface for pivoting components, guide pins, or linkage assemblies. The 5/16-18 UNC thread provides secure clamping, while the 3/16 inch hex socket drive allows installation with standard Allen keys or hex bit drivers. This fastener meets ASME/ANSI B18.3, ASTM F835, and IFI 124 standards, making it appropriate for demanding mechanical assemblies in industrial and commercial applications.

Shoulder screws of this type are commonly installed in machine fixtures, jigs, die sets, linear slide assemblies, and rotating linkage mechanisms where the unthreaded shoulder serves as the primary bearing or pivot surface. The 4140 alloy steel construction handles moderate-to-high stress environments. Machinists, millwrights, and maintenance technicians typically install these fasteners in production equipment and mechanical subassemblies requiring tight dimensional tolerances at the shoulder.

Key Features

• 3/8 inch shoulder diameter with 2 inch shoulder length for precise bearing surface fitment
• 5/16-18 UNC thread standard for compatibility with standard tapped holes
• 4140 alloy steel construction for high strength and wear resistance
• 3/16 inch hex socket drive for installation with Allen keys or hex bit drivers
• 9/16 inch head diameter and 1/4 inch head height for low-profile clamping
• Meets ASME/ANSI B18.3, ASTM F835, and IFI 124 standards

Compatibility

Designed as a standard shoulder screw for use in mechanical assemblies requiring a 3/8 inch diameter shoulder, 5/16-18 UNC threaded engagement, and a hex socket drive per ASME/ANSI B18.3.

Installation Notes

Installation is typically performed by machinists or maintenance technicians using a 3/16 inch hex key or hex socket bit. Ensure the mating tapped hole is clean and dimensionally correct for 5/16-18 UNC thread engagement before installation. Do not use the shoulder threads as the primary bearing surface — the unthreaded shoulder is intended to carry radial loads. De-energize and lock out any equipment before replacing shoulder screws in active machinery per applicable OSHA lockout/tagout procedures.