Holo-krome 08086 Shoulder Screw 1/2 in Alloy Steel Hex Socket

Product Description

The HOLO-KROME 08086 is a Grade 8 alloy steel shoulder screw designed for precision fastening applications requiring a tight-tolerance cylindrical bearing surface. The shoulder measures 0.500 inches in diameter and 2.750 inches in length, providing a smooth, hardened shank that acts as a pivot, guide pin, or bearing surface within an assembly. The threaded portion is 3/8-16 UNC with a 0.625-inch thread length. Drive engagement is via a 1/4-inch hex socket in a rounded head measuring 0.750 inches in diameter and 0.3125 inches in height. This fastener is installed by mechanical assemblers, millwrights, and maintenance technicians working on jigs, fixtures, linkages, and precision machinery.

Shoulder screws of this type are commonly used in industrial machinery, automation equipment, stamping dies, and mechanical linkages where a close-tolerance pivot or guide post is required. The uncoated alloy steel construction and Grade 8 material rating make this screw suitable for high-load, high-cycle applications. Overall installed length is approximately 3.687 inches. This screw is sold individually and is appropriate for both OEM builds and field maintenance repairs on equipment requiring precise pin-style fastening.

Key Features

• 0.500-inch shoulder diameter with 2.750-inch shoulder length for consistent bearing and pivot performance
• Grade 8 alloy steel construction for high tensile strength under mechanical load
• 3/8-16 UNC threaded shank with 0.625-inch thread length
• 1/4-inch hex socket drive in a rounded head for positive torque engagement
• Uncoated finish suitable for use as-is or with customer-applied coatings
• Meets ASME B1.1 and ASME B18.3 dimensional standards

Compatibility

Designed as an OEM-style replacement or direct-fit shoulder screw for industrial assemblies, jigs, fixtures, and mechanical linkages requiring a 1/2-inch shoulder diameter and 3/8-16 threaded shank conforming to ASME B18.3.

Installation Notes

Installation requires a 1/4-inch hex key or matching hex socket bit. Ensure the mating bore is machined to the appropriate close-tolerance fit for the 0.500-inch shoulder before installation. Do not over-torque the threaded section, as the shoulder, not the head, is the primary load-bearing feature. De-energize and lock out any machinery before replacing shoulder screws in live assemblies.