Holo-krome 08016 Shoulder Screw 5/16 in Alloy Steel Hex Socket

Product Description

The HOLO-KROME 08016 is a Grade 8 alloy steel shoulder screw with a 5/16-inch shoulder diameter and a 3/8-inch shoulder length. The shoulder, also called a stripper bolt or precision shoulder bolt, provides a hardened, precision-ground cylindrical surface used as a pivot, guide pin, or linear motion bearing in jigs, fixtures, dies, and mechanical assemblies. The 1/4-20 UNRC thread runs 0.438 inches in length, giving a secure fastener engagement while leaving the shoulder fully exposed for its intended function. A hex socket drive in the rounded head allows installation with a standard Allen key or hex bit driver. This fastener is typically installed by machinists, tool and die makers, maintenance technicians, and industrial mechanics.

The 08016 is suited for light-duty precision applications where a ground shoulder diameter acts as a locating or bearing surface. Common uses include punch-and-die sets, stripper plates, plastic injection molds, robotic end-of-arm tooling, and general machine fixture work. The uncoated finish keeps the shoulder diameter at its ground tolerance, making it appropriate where dimensional accuracy of the bearing surface is critical. The 0.438-inch thread length is short by design, ensuring the screw draws the mating component tight against the shoulder without bottoming out in blind tapped holes of standard depth.

Key Features

• Grade 8 alloy steel construction for high shear strength and hardness at the shoulder surface
• 5/16-inch shoulder diameter (0.3120 inches decimal) ground to close tolerance for precision fit
• 3/8-inch shoulder length provides a defined bearing or pivot zone
• 1/4-20 UNRC thread, 0.438 inches long, for secure thread engagement
• 5/32-inch hex socket drive in a rounded head for torque application with Allen keys or hex bit sets
• Uncoated finish maintains ground shoulder diameter tolerance
• Meets ASME B1.1 and ASME B18.3 standards

Compatibility

Designed as an OEM-style replacement or direct-fit fastener for applications requiring a 5/16-inch shoulder diameter, 3/8-inch shoulder length, and 1/4-20 thread in Grade 8 alloy steel shoulder screw configurations.

Installation Notes

Installation is performed by machinists or maintenance technicians using a 5/32-inch hex key or hex bit driver. De-energize and lock out any machine or fixture before replacing or installing shoulder screws in active assemblies. Do not overtorque into tapped holes shallower than the thread length, as this can strip threads or crack the mating component. ASME B18.3 governs dimensional and mechanical requirements for this fastener type.