Value Collection 225109PR Shoulder Screw 1/2 in 4140 Steel

Product Description

The VALUE COLLECTION 225109PR is a hex socket shoulder screw machined from 4140 alloy steel for use in precision mechanical assemblies, fixtures, and jigs. The shoulder measures 0.5 inches in diameter and 1 inch in length, providing an accurate locating surface for bushings, linkages, and pivot points. The 3/8-16 UNC threaded shank secures the fastener to the mating component, while the 3/4-inch diameter socket head accepts a 1/4-inch hex key for installation in tight clearance applications. This screw meets ASME/ANSI B18.3, ASTM F835, and IFI 124 standards, making it suitable for demanding industrial and mechanical service environments where dimensional precision and material strength are required.

Shoulder screws of this type are commonly installed by machinists, tool and die makers, millwrights, and maintenance technicians working on production fixtures, cam mechanisms, die sets, and precision pivot assemblies. The 4140 alloy steel construction provides the hardness and wear resistance needed for applications involving repeated motion or load transfer through the shoulder. This fastener is sold individually but requires a minimum order of 5 units.

Key Features

• 0.5-inch shoulder diameter and 1-inch shoulder length provide a precision locating surface for bushings and pivot components
• 4140 alloy steel construction delivers high tensile strength and wear resistance
• 3/8-16 UNC threaded shank for secure fastening to tapped mating components
• 3/4-inch head diameter with 1/4-inch hex socket drive for installation in confined spaces
• Meets ASME/ANSI B18.3, ASTM F835, and IFI 124 standards
• 5/16-inch head height keeps the profile low in assembled configurations

Compatibility

Designed as a standard shoulder screw for use in mechanical fixtures, jigs, die sets, and precision pivot assemblies requiring a 1/2-inch shoulder diameter and 3/8-16 UNC thread engagement.

Installation Notes

Shoulder screws are typically installed by machinists or mechanical technicians using a 1/4-inch hex key. Ensure the mating tapped hole is clean and properly sized for 3/8-16 UNC thread engagement before installation. Do not apply torque to the shoulder surface. Verify that the shoulder diameter tolerance matches the bore or bushing fit required by the assembly design before installing.