Value Collection 225091PR Shoulder Screw 3/8 in 4140 Alloy Steel

Product Description

The VALUE COLLECTION 225091PR is a hex socket shoulder screw machined from 4140 alloy steel, designed for precision-fit applications where a hardened, accurate shoulder diameter is required. The shoulder measures 0.375 inches in diameter and 3.5 inches in length, providing a reliable bearing or pivot surface in mechanical assemblies. The 5/16-18 UNC thread engages a tapped hole to clamp or locate components while the smooth shoulder guides motion or holds alignment. This fastener is installed by maintenance technicians, machine builders, and industrial mechanics in both production and repair settings.

Shoulder screws of this type are commonly used in jigs, fixtures, dies, robotic end-of-arm tooling, conveyor assemblies, and general mechanical linkages where a precise pivot or guide pin is needed. The hex socket drive allows installation with a standard hex key or socket driver in tight clearance areas. This screw is sold individually but carries a minimum order quantity of 5 units per order.

Key Features

• 0.375-inch shoulder diameter provides a precision bearing surface for guided or pivoting components
• 3.5-inch shoulder length accommodates deep stack assemblies or extended guide applications
• 4140 alloy steel construction offers high tensile strength and wear resistance
• 5/16-18 UNC thread is a common standard size for broad hardware compatibility
• 3/16-inch hex socket drive allows installation with a standard hex key in confined spaces
• 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 0.375-inch shoulder diameter and 5/16-18 UNC thread; confirm tapped hole depth and clearance bore diameter before installation.

Installation Notes

Installation requires a 3/16-inch hex key or appropriate hex socket driver. Power down and de-energize any machinery before servicing fasteners in moving assemblies. Do not use impact drivers on hex socket shoulder screws, as this can damage the drive recess or distort the shoulder. Verify mating bore and thread dimensions against the assembly drawing prior to installation.