Value Collection A997112 Shoulder Screw 5/16 in 4140 Steel

Product Description

The VALUE COLLECTION A997112 is a shoulder screw machined from 4140 alloy steel, designed for precision-fit applications where a smooth, hardened shoulder serves as a bearing surface, pivot point, or guide pin. The shoulder diameter measures 0.312 inches (5/16 inch nominal) with a shoulder length of 2.75 inches (2-3/4 inches). Fastening is accomplished through a 5/32-inch hex socket drive, allowing torque to be applied in tight clearances. The thread size is 1/4-20 UNC. The screw ships with an uncoated finish, preserving the base steel surface for applications where coating buildup on the shoulder would affect fit. Sold in a package of 5.

This shoulder screw is used in mechanical assemblies, jigs, fixtures, and tooling where a precise cylindrical shoulder must be maintained independent of the threaded section. Common applications include linkage pivots, die sets, linear guide elements, and panel-mount applications in industrial and light manufacturing environments. The 4140 alloy steel construction provides the hardness and tensile strength needed for demanding cyclic load and wear conditions. Machinists, toolmakers, and maintenance mechanics working in fabrication and equipment repair environments typically install this fastener.

Key Features

• 5/16-inch nominal shoulder diameter (0.312 inches decimal) for precision bore fit
• 2-3/4-inch shoulder length provides extended bearing or pivot surface
• 4140 alloy steel construction for high tensile strength and wear resistance
• 1/4-20 UNC thread for compatibility with standard tapped holes
• 5/32-inch hex socket drive for access in confined spaces
• Uncoated finish maintains tight shoulder diameter tolerance
• Meets ANSI B18.3 and ASME/ANSI B18.3 and ASTM A574 standards

Compatibility

Designed as a standard ANSI B18.3 hex socket shoulder screw suitable for use in fixtures, jigs, die sets, and mechanical assemblies requiring a 5/16-inch shoulder diameter and 1/4-20 UNC threaded section.

Installation Notes

Installation requires a 5/32-inch hex key or socket bit. Ensure the receiving bore is machined to the appropriate tolerance for the 5/16-inch shoulder to achieve proper fit and function. Confirm the mating tapped hole is clean and correctly sized for 1/4-20 UNC threads before installation. Do not apply thread-locking compounds to the shoulder surface.