Proto J5220SPL Spline Socket 3/8 in Drive 22 Spline

Product Description

The PROTO J5220SPL is a 12-point spline socket designed for professional-grade fastener removal and installation. Built around a 3/8 inch drive, it accepts a 5/8 inch hex fastener and is sized for 22-spline applications. Spline sockets distribute torque across multiple contact points rather than concentrating force on fastener corners, which reduces rounding on worn or corroded hardware. This socket meets Federal Specification GGG-W-641e and ANSI Specification B107.1, making it suitable for government contract work and jobs where documented compliance is required. It is used by mechanics, maintenance technicians, and trade professionals working on equipment with spline-drive fasteners.

This socket is well suited for automotive, industrial, and equipment maintenance applications where spline fasteners are encountered on drivetrain components, steering assemblies, or heavy machinery. The 3/8 inch drive size makes it compatible with standard 3/8 inch drive ratchets, extensions, and torque wrenches commonly found in professional tool sets. It is a single-piece replacement socket sold individually, appropriate for adding to an existing socket set or replacing a worn unit.

Key Features

• 3/8 inch drive size fits standard ratchets, extensions, and torque wrenches
• 22 spline sizing for spline-drive fastener applications
• 5/8 inch hex size for precise fastener engagement
• 12-point contact geometry distributes torque to reduce fastener rounding
• Meets Federal Spec GGG-W-641e and ANSI Spec B107.1 for compliance-critical jobs

Compatibility

Designed as an OEM-style replacement spline socket for use with 3/8 inch drive tool systems requiring a 22-spline, 5/8 inch hex socket.

Installation Notes

This socket is installed and used by mechanics and maintenance technicians working on spline-fastened assemblies. Ensure the drive tool and socket are fully seated before applying torque to avoid slippage or socket damage. Inspect the socket for cracks or wear before each use, and retire any socket showing signs of deformation. Follow applicable workplace safety and tool-use guidelines when working in high-torque or confined-space environments.