Holo-krome 08120 Shoulder Screw 5/8 in Alloy Steel Hex Socket

Product Description

The HOLO-KROME 08120 is an alloy steel shoulder screw designed for precision mechanical assemblies requiring tight dimensional tolerances and controlled shoulder fit. The screw features a 5/8 inch shoulder diameter and a 4 inch shoulder length, providing a precise bearing surface for rotating or sliding components such as linkages, pivot points, and guide mechanisms. The threaded end is 1/2-13 UNC with a 3/4 inch thread length. Drive engagement is via a 5/16 inch hex socket in a rounded head measuring 7/8 inch in diameter and 3/8 inch in height. The uncoated alloy steel construction meets ASME B1.1 and ASME B18.3 standards. This fastener is installed by machinists, millwrights, and maintenance technicians in industrial and commercial equipment applications.

Shoulder screws of this type are commonly used in jigs, fixtures, die sets, and machinery where a hardened, ground shoulder acts as a shaft or bearing surface. The 5/8 inch shoulder diameter and 4 inch shoulder length make this screw suited to applications requiring extended travel or a longer pivot span. Typical installation environments include manufacturing equipment, hydraulic and pneumatic assemblies, and mechanical linkages across a range of industrial settings. This screw ships individually and is sold in single-unit quantities.

Key Features

• 5/8 inch shoulder diameter with 4 inch shoulder length for extended pivot and bearing surface applications
• 1/2-13 UNC thread at 3/4 inch thread length for secure fastening engagement
• Grade 8 alloy steel construction for high tensile strength and durability
• 5/16 inch hex socket drive in a rounded head for precise torque application with standard hex keys
• Uncoated finish — suitable for use as-supplied or for further surface treatment
• Conforms to ASME B1.1 and ASME B18.3 dimensional standards

Compatibility

Designed as an OEM-style replacement or direct-use shoulder screw for industrial machinery, jigs, fixtures, and mechanical assemblies requiring a 5/8 inch diameter shoulder at 4 inches in length with a 1/2-13 UNC threaded end.

Installation Notes

Installation is typically performed by machinists, millwrights, or maintenance technicians using a 5/16 inch hex key or socket driver. De-energize and lock out all equipment before fastener installation or replacement per applicable OSHA lockout/tagout procedures. Ensure the mating bore diameter matches the 5/8 inch shoulder dimension to achieve the intended fit class. Do not use impact drivers on hex socket shoulder screws, as this can damage the socket recess or alter the seating torque.