Holo-krome 08018 Shoulder Screw 5/16 in Hex Socket Alloy Steel

Product Description

The HOLO-KROME 08018 is a hex socket shoulder screw machined from Grade 8 alloy steel, designed for precision fastening applications where a controlled-diameter shoulder serves as a bearing surface, pivot point, or locating pin. The shoulder measures 5/16 inch in diameter and 1/2 inch in length, with a 1/4-20 UNC threaded end extending 0.438 inches. The rounded head accepts a 5/32 inch hex key drive. Overall assembled length is 1.157 inches. This fastener is installed by maintenance technicians, machine builders, and industrial assembly professionals in applications requiring tight positional tolerances.

Shoulder screws of this type are used in jigs, fixtures, dies, cams, linkages, and precision mechanical assemblies where a hardened, ground shoulder must rotate freely in a bore or act as a stop. The 5/16 inch shoulder diameter suits tight-tolerance bores in light to medium duty mechanical components. The uncoated finish maintains dimensional accuracy without adding coating thickness variability. This screw conforms to ASME B18.3 for hex socket fasteners and ASME B1.1 for thread form, making it suitable for controlled industrial and OEM environments.

Key Features

• Grade 8 alloy steel construction for high tensile strength in demanding mechanical assemblies
• 5/16 inch shoulder diameter with 0.3120 inch decimal dimension for precise bore fitment
• 1/2 inch shoulder length provides consistent bearing surface or pivot travel
• 1/4-20 UNC thread at 0.438 inch length for secure threaded engagement
• 5/32 inch hex socket drive allows torque application in confined spaces
• Conforms to ASME B18.3 and ASME B1.1 standards

Compatibility

Designed as a standard ASME B18.3 hex socket shoulder screw for use in precision mechanical assemblies, jigs, fixtures, and OEM equipment requiring a 5/16 inch shoulder diameter and 1/4-20 threaded shank.

Installation Notes

Installation is performed by machine builders, tool and die technicians, or maintenance professionals using a 5/32 inch hex key or T-handle driver. De-energize and lock out all equipment before servicing any assembly containing this fastener. Do not exceed the rated torque capacity of the 1/4-20 thread; consult published torque tables for Grade 8 alloy steel at this thread size. Verify bore diameter tolerance against the 0.3120 inch shoulder dimension before assembly to ensure proper fit and intended shoulder function.