Value Collection 221079PR Shoulder Screw 3/8 in Grade 8

Product Description

The VALUE COLLECTION 221079PR is a Grade 8 alloy steel shoulder screw designed for precision fastening applications requiring a tight-tolerance cylindrical shoulder. The shoulder measures 3/8 inches in diameter and 2-1/2 inches in overall length, with a 5/16-18 UNC threaded end. Drive engagement is through a 3/16-inch hex socket recess. The head is hex-style with a height of 0.250 inches and a diameter between 0.543 and 0.562 inches. This screw is supplied uncoated and conforms to ANSI B18.3, ASME/ANSI B18.3, and ASTM A574 standards. Machinists, maintenance technicians, and assembly professionals install these in applications that require a pivot point, spacer, or guide for mating components.

Shoulder screws of this type are used across industrial machinery, jigs and fixtures, linkage assemblies, and mechanical pivot joints. The precision shoulder acts as a bearing surface or pivot pin while the threaded shank locks into a tapped hole. This part is sold individually but carries a minimum order quantity of 5 units, making it suitable for both repair stock and production builds. It is appropriate for both light industrial and heavy-duty mechanical assemblies where Grade 8 tensile strength is required.

Key Features

• 3/8-inch shoulder diameter provides a precision bearing or pivot surface
• 2-1/2-inch overall length accommodates deeper assemblies and linkage stacks
• 5/16-18 UNC thread for secure engagement in standard tapped holes
• Grade 8 alloy steel construction for high tensile strength in demanding applications
• 3/16-inch hex socket drive for torquing in confined spaces
• Meets ANSI B18.3, ASME/ANSI B18.3, and ASTM A574 standards
• Uncoated finish suitable for use as-is or with added corrosion protection

Compatibility

Designed as an OEM-style or replacement shoulder screw for industrial machinery, fixture builds, and mechanical assemblies requiring a 3/8-inch shoulder diameter with 5/16-18 UNC threading.

Installation Notes

Installation is performed by machinists or maintenance technicians using a 3/16-inch hex key or Allen wrench. Ensure the mating tapped hole is clean and within tolerance before driving the screw. Do not over-torque into soft or thin materials; follow applicable mechanical assembly standards for Grade 8 fasteners. Minimum order quantity of 5 units applies when sourcing this part.