Value Collection 221172BR Shoulder Screw 5/8 in Alloy Steel

Product Description

The VALUE COLLECTION 221172BR is a Grade 8 alloy steel shoulder screw with a 5/8-inch shoulder diameter and a 2-1/4-inch shoulder length. The threaded end is 1/2-13 UNC, and drive engagement is through a 5/16-inch hex socket. The head measures 7/8 inch in diameter and 3/8 inch in height. The uncoated finish leaves the base alloy steel exposed, which is standard for applications where additional coatings are not required. This fastener is installed by machinists, millwrights, and maintenance technicians in mechanical assemblies where a precise, hardened pivot or shoulder is needed.

Shoulder screws of this type are commonly used in industrial machinery, jigs and fixtures, die sets, linkage assemblies, and precision mechanical components. The shoulder acts as a bearing surface or pivot point, allowing mating parts to rotate or slide against the shoulder diameter with controlled clearance. The 5/8-inch shoulder diameter and 2-1/4-inch shoulder length suit medium-duty mechanical assemblies in both production and maintenance environments.

Key Features

• Grade 8 alloy steel construction for high tensile strength in demanding fastener applications
• 5/8-inch shoulder diameter provides a precise bearing or pivot surface
• 2-1/4-inch shoulder length accommodates medium-depth assemblies
• 1/2-13 UNC thread for standard engagement with compatible tapped holes
• 5/16-inch hex socket drive for installation with standard Allen or hex key tooling
• Meets ANSI B18.3 and ASME/ANSI B18.3 and ASTM A574 standards

Compatibility

Designed as an OEM-style replacement or maintenance fastener for mechanical assemblies requiring a 5/8-inch shoulder diameter, 2-1/4-inch shoulder length, and 1/2-13 UNC threaded end in alloy steel construction.

Installation Notes

Installation is performed by machinists, millwrights, or maintenance technicians using a 5/16-inch hex key or Allen driver. Ensure the tapped receiving hole is clean and dimensionally correct for 1/2-13 UNC thread engagement before installation. Do not use an impact driver on hex socket shoulder screws, as this risks thread damage or over-torque. Verify shoulder length and diameter clearances against mating components prior to assembly.