Value Collection 221049PR Shoulder Screw 3/8 in Alloy Steel

Product Description

The VALUE COLLECTION 221049PR is an alloy steel shoulder screw built for precision fastening applications where a controlled-diameter shank is required to act as a pivot, shaft, or locating pin. The shoulder measures 0.375 inches in diameter and 0.375 inches in length, providing a consistent bearing surface between mating components. The threaded portion is 5/16-18 UNC, and the head is driven by a 3/16-inch hex socket key. This fastener is supplied uncoated and meets ANSI B18.3 and ASTM A574 standards. Machinists, tool-and-die technicians, and maintenance mechanics commonly install this type of fastener in jigs, fixtures, linkages, and mechanical assemblies.

Shoulder screws of this type are used across a wide range of industrial and mechanical applications, including assembly fixtures, cam mechanisms, pivot joints, and guide pin installations. The precise shoulder diameter allows mating bores to be machined to close tolerances, enabling smooth rotational or sliding motion without relying on the threaded shank for alignment. This part is sold individually but must be ordered in multiples of 25.

Key Features

• 0.375-inch shoulder diameter provides accurate locating and bearing surface
• 0.375-inch shoulder length suits shallow pivot and guide pin applications
• 5/16-18 UNC thread for secure clamping into tapped holes
• 3/16-inch hex socket drive for installation with a standard Allen key or hex bit
• Grade 8 alloy steel construction for high tensile strength
• Meets ANSI B18.3, ASME/ANSI B18.3, and ASTM A574 standards

Compatibility

Designed as an OEM-style or replacement shoulder screw for mechanical assemblies, fixtures, and linkages requiring a 3/8-inch shoulder diameter and 5/16-18 UNC threaded engagement.

Installation Notes

Installation is typically performed by machinists or mechanical maintenance technicians using a 3/16-inch hex key or socket driver. The mating bore should be sized to the shoulder diameter for the intended fit class before installation. Ensure the tapped hole depth accommodates the threaded portion without bottoming out the shoulder prematurely. Do not use an impact driver on hex socket head shoulder screws, as over-torquing can compromise the precision shoulder or damage the socket recess.