Value Collection 225139PR Shoulder Screw 1/2 in 3-1/2 in 3/8-16

Product Description

The VALUE COLLECTION 225139PR is a hex socket shoulder screw machined from 4140 alloy steel, designed for precision fastening applications that require a smooth, close-tolerance shoulder as a bearing or locating surface. The shoulder measures 0.5 inches in diameter and 3.5 inches in length, with a 3/8-16 UNC threaded section. The 1/4-inch hex socket drive allows installation with a standard hex key or Allen-style driver. This screw is built to ASME/ANSI B18.3, ASTM F835, and IFI 124 standards, making it appropriate for industrial, mechanical, and structural assembly work where dimensional consistency is critical.

Shoulder screws of this configuration are commonly used in machinery, fixtures, jigs, and linkage assemblies where a rotating or sliding component must be retained on a fixed axis. The smooth shoulder acts as a precision pivot, guide pin, or spacer. This part is suited for mechanical assembly technicians, millwrights, and maintenance professionals working on production equipment, conveyor systems, tooling fixtures, or any application requiring controlled shoulder-to-bore clearance fits.

Key Features

• 4140 alloy steel construction for high tensile strength and wear resistance
• 0.5-inch shoulder diameter with 3.5-inch shoulder length for deep clearance or guide applications
• 3/8-16 UNC threaded shank for standard nut and tapped-hole compatibility
• 1/4-inch hex socket drive for precise torque application with common hand or power tools
• 3/4-inch head diameter and 5/16-inch head height for positive seating against mating surfaces
• Meets ASME/ANSI B18.3, ASTM F835, and IFI 124 standards

Compatibility

Designed as a standard shoulder screw for use in any application requiring a 0.5-inch shoulder diameter, 3.5-inch shoulder length, and 3/8-16 UNC thread engagement in conformance with ASME/ANSI B18.3 dimensional standards.

Installation Notes

Installation should be performed by a qualified mechanical technician using a 1/4-inch hex key or equivalent driver. Ensure the tapped hole or nut thread is clean and free of debris before driving the screw. Do not exceed the recommended torque for 3/8-16 hardware in the base material being fastened. Verify shoulder-to-bore clearance fits before final assembly to avoid binding or premature wear.