Holo-krome 08028 Shoulder Screw 5/16 in Alloy Steel Hex Socket

Product Description

The HOLO-KROME 08028 is a Grade 8 alloy steel shoulder screw with a hex socket drive, designed for precision fastening applications that require an accurately machined cylindrical shoulder. The shoulder measures 5/16 inches in diameter and 1-1/2 inches in length, providing a tight-tolerance bearing surface for pivots, links, and guided assemblies. A 1/4-20 UNRC thread with a 0.438-inch thread length secures the fastener into the mating component. Overall length is 2.157 inches. The uncoated finish suits applications where plating or coating would compromise dimensional accuracy. Installed by maintenance technicians, machine builders, and industrial equipment assemblers.

This shoulder screw is suited for use in mechanical assemblies requiring a fixed-diameter pivot or guide post, such as linkages, jigs, fixtures, cams, and precision motion components. The accurately ground shoulder serves as the functional bearing surface, allowing mating parts to rotate or slide against it without relying on thread dimensions. This type of fastener is common in industrial machinery, tooling, and equipment manufactured to ASME standards. The hex socket head allows installation in tight clearance areas using a 5/32-inch hex key.

Key Features

• Grade 8 alloy steel construction for high tensile strength in demanding fastening applications
• 5/16-inch shoulder diameter with precision tolerance for accurate pivot and guide use
• 1-1/2-inch shoulder length provides substantial bearing surface for linkage and fixture assemblies
• 1/4-20 UNRC thread with 0.438-inch thread length per ASME B18.3 and ASME B1.1 standards
• 5/32-inch hex socket drive for installation in confined spaces
• Uncoated finish maintains dimensional accuracy where coatings would add unwanted material buildup

Compatibility

Designed as a standard ASME B18.3 shoulder screw for use in industrial machinery, tooling fixtures, and mechanical assemblies requiring a 5/16-inch diameter shoulder with 1/4-20 threaded engagement.

Installation Notes

Installation is performed with a 5/32-inch hex key or hex socket driver. Ensure the threaded bore in the mating component is clean and correctly tapped to 1/4-20 UNRC before driving the fastener. Do not use the shoulder threads as the bearing surface; the machined shoulder is the load-carrying element. Torque to the value specified by the equipment manufacturer or applicable ASME fastener guidelines for the material and joint configuration.