Holo-krome 08038 Hex Socket Shoulder Screw 3/8 in Alloy Steel

Product Description

The HOLO-KROME 08038 is a hex socket shoulder screw manufactured from Grade 8 alloy steel with an uncoated finish. The shoulder diameter measures 0.375 inches and the shoulder length measures 0.625 inches, giving precision bearing surfaces for applications that require a tight-tolerance pivot or guide pin. The 5/16-18 UNRC threaded section is 0.5 inches long, and overall length is 1.375 inches. The rounded head stands 0.25 inches tall with a head diameter ranging from 0.543 to 0.562 inches. Drive engagement is through a 3/16-inch hex socket. This fastener is installed by machinists, millwrights, and maintenance technicians in industrial and mechanical assembly work where shoulder fit, alignment, or pivot function is required.

The 08038 is suited for use in jigs, fixtures, dies, machine components, and mechanical assemblies where a controlled shoulder diameter provides a bearing or locating surface. The Grade 8 alloy steel construction handles demanding load and shear conditions in both production and maintenance environments. The uncoated finish is appropriate for applications where secondary coating or lubrication will be applied by the installer.

Key Features

• Shoulder diameter of 0.375 inches provides a precision locating and bearing surface
• Grade 8 alloy steel construction for high shear and tensile load capacity
• 5/16-18 UNRC thread standard per ASME B1.1 ensures interchangeability
• 3/16-inch hex socket drive for positive torque engagement in tight clearances
• Uncoated finish compatible with field-applied lubricants or coatings
• Conforms to ASME B18.3 socket screw standards

Compatibility

Designed as a standard ASME B18.3 hex socket shoulder screw compatible with any application calling for a 3/8-inch shoulder diameter, 5/8-inch shoulder length, and 5/16-18 UNRC thread specification.

Installation Notes

Install using a 3/16-inch hex key or socket driver. Ensure the mating bore is reamed or drilled to a tolerance compatible with a 0.375-inch shoulder for proper fit. Torque the threaded section into the tapped hole without applying clamping force across the shoulder bearing surface unless the design requires it. Follow applicable mechanical assembly standards and inspect thread engagement depth before final assembly.