Holo-krome 08128 Shoulder Screw 3/4 in Alloy Steel Hex Socket

Product Description

The HOLO-KROME 08128 is a hex socket shoulder screw machined from Grade 8 alloy steel, designed for precision fastening applications where a smooth, unthreaded shoulder is required to act as a bearing surface, pivot, or locating pin. The shoulder measures 3/4 inch in diameter and 1-3/4 inches in length, providing a controlled, ground surface for rotating or sliding components. The threaded section is 5/8-11 UNC and 7/8 inch long. Drive engagement is via a 3/8 inch hex socket. Overall length is 3-1/8 inches. This screw is installed by mechanical assemblers, maintenance technicians, and tooling specialists in production and repair environments.

Shoulder screws of this type are used in jigs, fixtures, die sets, linkages, and machine assemblies where a precision shaft or pivot is needed without a separate dowel or pin. The 3/4 inch shoulder diameter and 1-3/4 inch shoulder length suit medium-to-heavy-duty mechanical assemblies. The uncoated finish is appropriate for applications where dimensional tolerances are critical and additional coatings would affect fit. Meets ASME B18.3 socket cap and shoulder screw standards as well as ASME B1.1 thread form requirements.

Key Features

• 3/4 inch shoulder diameter with 1-3/4 inch shoulder length for precise bearing and pivot applications
• Grade 8 alloy steel construction for high tensile strength and wear resistance
• 5/8-11 UNC thread with 7/8 inch thread length for secure clamping engagement
• 3/8 inch hex socket drive for standard Allen wrench or hex bit installation
• Uncoated finish preserves dimensional accuracy for tight-tolerance fits
• Meets ASME B18.3 and ASME B1.1 standards

Compatibility

Designed as a standard shoulder screw for use in mechanical assemblies, tooling fixtures, die sets, and linkage systems requiring a 3/4 inch diameter precision shoulder and 5/8-11 UNC threaded engagement.

Installation Notes

Installation is performed with a 3/8 inch hex key or socket bit driver. Ensure the mating bore is sized to the shoulder diameter tolerance specified in ASME B18.3 before installation. Do not use impact tools on socket shoulder screws, as this can damage the hex socket or alter the shoulder surface. Follow applicable mechanical assembly standards and torque guidelines published in ASME B18.3 for the applicable screw size.