Value Collection 225079PR Shoulder Screw 3/8 in 4140 Alloy Steel

Product Description

The VALUE COLLECTION 225079PR 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 0.375 inches in diameter and 2.5 inches in length, providing an accurate bearing surface for pivot points, linkages, and guided components. The 5/16-18 UNC threaded section locks the fastener securely into tapped holes. A 3/16-inch hex socket drive allows installation with a standard hex key or Allen driver. This fastener is specified by machinists, tool and die makers, and maintenance technicians who require close-tolerance shoulder dimensions for controlled-motion assemblies.

Shoulder screws of this type are used wherever a precision-ground cylindrical surface is needed to serve as a shaft, pivot, or guide post. Common applications include die sets, cam mechanisms, stripper plates, plastic injection tooling, and general industrial machinery. The 4140 alloy steel construction provides high tensile strength and wear resistance suitable for demanding production environments. This fastener is appropriate for both OEM manufacturing and MRO replacement use in industrial maintenance settings.

Key Features

• Shoulder diameter of 0.375 inches provides a precision bearing surface for pivot and guide applications
• 2.5-inch shoulder length suits deeper fixture and tooling assemblies
• 4140 alloy steel construction delivers high strength and resistance to wear and fatigue
• 5/16-18 UNC thread standard ensures broad compatibility with standard tapped holes
• 3/16-inch hex socket drive for installation with a hex key or Allen driver
• Meets ASME/ANSI B18.3, ASTM F835, and IFI 124 standards

Compatibility

Designed as a standard shoulder screw conforming to ASME/ANSI B18.3, ASTM F835, and IFI 124 specifications, suitable for tapped 5/16-18 UNC holes in industrial fixtures, tooling, and mechanical assemblies requiring a 3/8-inch shoulder diameter.

Installation Notes

Installation is performed by machinists or maintenance technicians using a 3/16-inch hex key. Ensure the receiving tapped hole meets 5/16-18 UNC thread specifications and is clean and free of debris before installation. Do not overtorque the threaded section, as the shoulder must seat flush against the mating surface to function as an accurate bearing or pivot surface. Follow applicable facility safety lockout/tagout procedures before servicing any machinery where this fastener is being replaced.