Value Collection 221061P Shoulder Screw 3/8 in Alloy Steel

Product Description

The VALUE COLLECTION 221061P is a shoulder screw designed for precision alignment and pivot applications in mechanical assemblies. The shoulder diameter measures 0.375 inches with a 1-inch shoulder length, providing a precise bearing surface for bushings, bearings, or rotating components. The head is rounded with a 3/16-inch hex socket drive and a head height of 0.25 inches. Manufactured from Grade 8 alloy steel with an uncoated finish, this fastener meets ANSI B18.3, ASME/ANSI B18.3, and ASTM A574 standards. It is sold in multiples of 25 with a package quantity of 1.

Shoulder screws of this type are commonly used in jigs, fixtures, tooling plates, linkages, and pivot assemblies across manufacturing, machining, and mechanical maintenance environments. The 5/16-18 UNC threaded section engages a tapped hole while the precision-ground shoulder provides a controlled-clearance fit for a bushing or bearing bore. This part is appropriate for applications where a hardened, dimensionally consistent shoulder is required for repeatable alignment or articulating motion.

Key Features

• 0.375-inch precision shoulder diameter for accurate bore-to-shoulder fit
• 1-inch shoulder length accommodates standard bushing and bearing stack heights
• Grade 8 alloy steel construction for high tensile strength and durability
• 3/16-inch hex socket drive for installation with standard Allen keys or hex drivers
• 5/16-18 UNC thread standard ensures broad tap compatibility
• Meets ANSI B18.3, ASME/ANSI B18.3, and ASTM A574 standards

Compatibility

Designed as a standard UNC shoulder screw for use in precision mechanical assemblies requiring a 3/8-inch shoulder diameter and 5/16-18 threaded engagement. Verify bore diameter and thread depth against assembly drawings before installation.

Installation Notes

Installation is performed by mechanical technicians, machinists, or maintenance personnel using a 3/16-inch hex key or socket driver. Ensure the mating tapped hole is clean and dimensionally correct for 5/16-18 UNC thread engagement before driving the screw. Do not overtighten, as the shoulder must remain free to rotate within its bore in pivot applications. Always confirm shoulder clearance fit tolerance against the applicable engineering drawing or standard before assembly.