Holo-krome 08108 Shoulder Screw 5/8 in Alloy Steel Hex Socket

Product Description

The HOLO-KROME 08108 is a hex socket shoulder screw machined from Grade 8 alloy steel with an uncoated finish. The shoulder measures 0.625 inches in diameter and 2.25 inches in length, providing a precise bearing surface for rotating or sliding components. The threaded portion is 1/2-13 UNC with a 0.75-inch thread length. The rounded head is 0.875 inches in diameter and 0.375 inches tall, driven by a 5/16-inch hex key. This fastener meets ASME B1.1 and ASME B18.3 standards and is installed by machinists, millwrights, and maintenance technicians in mechanical assemblies requiring a tight-tolerance pivot or guide pin.

Shoulder screws like the 08108 are used in jigs, fixtures, dies, and mechanical linkages where a smooth, hardened shank must bear radial load or act as a precision pivot point. The unthreaded shoulder seats into a bored hole to control alignment, while the threaded end clamps the assembly. This screw is suited for industrial machinery, tooling, and fabrication shop applications where dimensional accuracy and material strength are critical.

Key Features

• Grade 8 alloy steel construction for high tensile strength under load
• Shoulder diameter of 0.625 inches with 2.25-inch shoulder length for extended bearing surface
• 1/2-13 UNC thread with 0.75-inch thread length for secure clamping
• 5/16-inch hex socket drive for installation with standard Allen keys or hex bit drivers
• Rounded head profile, 0.875 inches in diameter and 0.375 inches tall, sits low in counterbored applications
• Uncoated finish; meets ASME B1.1 and ASME B18.3 dimensional standards

Compatibility

Designed as a standard ASME B18.3 shoulder screw for use in industrial fixtures, tooling, dies, and mechanical assemblies requiring a 0.625-inch precision shoulder and 1/2-13 UNC threaded end.

Installation Notes

Shoulder screws are typically installed by machinists or maintenance technicians using a 5/16-inch hex key or Allen driver. The mating bore for the shoulder should be machined to the appropriate tolerance to achieve the intended fit. Ensure the assembly is de-energized and depressurized before replacing fasteners in active machinery. Do not use an impact driver on hex socket shoulder screws, as this risks damaging the socket or over-torquing the threaded shank.