Value Collection 711208BR Shoulder Screw 4140 Alloy Steel

Product Description

The VALUE COLLECTION 711208BR is a shoulder screw machined from 4140 alloy steel, designed for use in precision mechanical assemblies where accurate alignment and controlled pivot or bearing surfaces are required. The shoulder measures 1.25 inches in diameter and 3 inches in length, providing a true bearing surface for bushings, rollers, and linkages. Drive engagement is through a 5/8-inch hex socket head, with a thread size of 7/8-9 UNC for secure fastening. The uncoated finish is suitable for applications where secondary coating or lubrication is applied in the field. This fastener is installed by machinists, maintenance technicians, and mechanical assemblers.

This shoulder screw is used in industrial and mechanical applications requiring a precision-ground shank to serve as a shaft, pivot, or guide. Common installations include jigs, fixtures, conveyor systems, linkage assemblies, and any application where a bushing or bearing must rotate or slide along a controlled-diameter surface. The 4140 alloy steel construction provides high tensile strength and wear resistance suitable for demanding load-bearing environments.

Key Features

• 1.25-inch shoulder diameter provides a precision bearing surface for bushings and rollers
• 3-inch shoulder length accommodates deeper assemblies and thicker workpieces
• 4140 alloy steel construction offers high tensile strength and wear resistance
• 7/8-9 UNC thread ensures secure clamping with standard tooling
• 5/8-inch hex socket drive for high-torque installation with standard Allen keys or socket drivers
• Meets ANSI B18.3, ASME/ANSI B18.3, and ASTM A574 standards

Compatibility

Designed as a standard shoulder screw conforming to ANSI B18.3 and ASME/ANSI B18.3 specifications, suitable for use in any mechanical assembly that accepts a 1-1/4-inch shoulder diameter, 7/8-9 UNC threaded shoulder screw.

Installation Notes

Installation should be performed by qualified machinists or mechanical technicians familiar with precision fastener assemblies. Ensure the mating bore is sized to the shoulder diameter tolerance before installation and that the threaded hole is clean and free of debris. Use a calibrated hex socket driver sized to 5/8 inch; do not use impact drivers on precision shoulder screws, as this can damage the shoulder surface or thread. Always verify thread engagement depth meets design requirements before applying load.