Value Collection 221157PR Shoulder Screw 1/2 in Alloy Steel

Product Description

The VALUE COLLECTION 221157PR is a hex socket shoulder screw machined from Grade 8 alloy steel with an uncoated finish. The shoulder measures 0.5 inches in diameter and 5 inches in length, providing a precise bearing surface for rotating or sliding components. The 3/8-16 UNC threaded section secures the fastener into a tapped hole, while the 3/4-inch head diameter and 5/16-inch head height accept a 1/4-inch hex key drive for installation. This shoulder screw meets ANSI B18.3, ASME/ANSI B18.3, and ASTM A574 standards, making it suitable for applications where dimensional accuracy and material strength are critical.

Shoulder screws of this type are used in mechanical assemblies where a precision-ground cylindrical surface is needed to guide motion, act as a pivot point, or retain a bearing or bushing. Common applications include jigs and fixtures, die sets, linkage assemblies, and industrial machinery. The 5-inch shoulder length suits deeper assemblies or setups requiring extended travel. Technicians and machinists working in manufacturing, tooling, and mechanical maintenance environments are the primary installers of this fastener type.

Key Features

• 0.5-inch shoulder diameter with 5-inch shoulder length for extended precision bearing surfaces
• Grade 8 alloy steel construction for high tensile strength and durability
• 3/8-16 UNC thread standard for secure engagement in standard tapped holes
• 1/4-inch hex socket drive for torque application with standard hex keys or drivers
• Uncoated finish suitable for use with added lubrication or surface treatments
• Meets ANSI B18.3, ASME/ANSI B18.3, and ASTM A574 standards

Compatibility

Designed as a standard shoulder screw for use in mechanical assemblies requiring a 0.5-inch diameter shoulder, 3/8-16 UNC threaded engagement, and a 1/4-inch hex socket drive in conformance with ANSI B18.3 specifications.

Installation Notes

Installation is performed by machinists or maintenance technicians using a 1/4-inch hex key or socket driver. Ensure the mating tapped hole is clean and correctly sized for the 3/8-16 UNC thread before driving the fastener. Do not overtighten, as the shoulder surface must remain free to function as a bearing or pivot interface. Consult applicable machinery safety and lockout/tagout procedures before servicing any assembly containing this fastener.