Holo-krome 08058 Shoulder Screw 3/8 in Alloy Steel Hex Socket

Product Description

The HOLO-KROME 08058 is a Grade 8 alloy steel shoulder screw designed for precision fastening applications that require a hardened, close-tolerance shoulder as a pivot, spacer, or guide pin. The shoulder measures 0.3750 inches in diameter and 3 inches in length, providing a reliable bearing surface. The threaded end is 5/16-18 UNC with a 0.5000-inch thread length. A hex socket drive accepts a 3/16-inch hex key for installation. The rounded head measures 0.2500 inches tall with a diameter of 0.5430 to 0.5620 inches. Overall length is 3.7500 inches. This fastener is installed by mechanical, maintenance, and assembly technicians across industrial and trade applications.

Shoulder screws of this type are commonly used in jigs, fixtures, tooling plates, linkage assemblies, and machine components where a smooth, hardened pin diameter is needed for rotational or sliding movement. The uncoated alloy steel construction at Grade 8 material designation provides high tensile strength suited for demanding mechanical environments. This screw is appropriate for both original equipment and MRO replacement scenarios.

Key Features

• Shoulder diameter of 0.3750 inches provides close-tolerance bearing surface
• 3-inch shoulder length suitable for thicker fixtures, linkages, and spacer applications
• Grade 8 alloy steel construction for high tensile strength
• 5/16-18 UNC thread with 0.5000-inch thread length for secure engagement
• 3/16-inch hex socket drive for torque-controlled installation
• Meets ASME B1.1 and ASME B18.3 standards

Compatibility

Designed as a standard ASME B18.3 shoulder screw for use in industrial machinery, fixtures, jigs, and mechanical assemblies requiring a 3/8-inch shoulder diameter and 3-inch shoulder length with 5/16-18 UNC threading.

Installation Notes

Installation is performed with a 3/16-inch hex key. Ensure the receiving bore is sized to the shoulder diameter tolerance for proper fit and function. De-energize and lock out any equipment before installing or removing fasteners in live assemblies. Follow applicable ASME fastener standards for seating torque guidelines appropriate to the material and joint design.