Proto j5218m 18mm 12 Point Socket 3/8 in Drive

Product Description

The PROTO j5218m is a 12-point metric socket designed for industrial and professional trade use. Built around an 18 mm opening with a 3/8 inch drive, it delivers reliable torque transfer on fasteners requiring precise engagement across multiple flats. The 12-point configuration allows for greater positional flexibility when ratcheting in confined spaces, making it a practical choice for mechanical, HVAC, and industrial maintenance work. Licensed tradespeople and professional technicians working in environments where tool quality and repeatability matter will find this socket a dependable fit for standard metric fastener service.

This socket is suited for industrial and commercial maintenance applications where 18 mm metric fasteners are common. Typical use cases include mechanical equipment service, structural fastener work, and general trade applications requiring a 3/8 inch drive tool. It is sold individually and is intended for professional and industrial end users rather than consumer or light-duty use.

Key Features

• 18 mm opening accommodates standard metric fasteners
• 12-point configuration provides 30-degree indexing for tighter swing arcs in confined areas
• 3/8 inch drive interface is compatible with standard 3/8 inch drive ratchets and extensions
• Sold individually for targeted replacement or single-socket purchases
• Intended for industrial and professional end-user applications

Compatibility

Designed for use with standard 3/8 inch drive ratchets, extensions, and torque wrenches; fits 18 mm 12-point metric fasteners in industrial and trade service applications.

Installation Notes

Always ensure the socket is fully seated on the drive and fastener before applying torque to prevent rounding or slippage. Verify the fastener size matches the 18 mm opening before use. Inspect the socket for cracks or wear before each use, particularly in high-cycle industrial environments. De-energize or lock out equipment before performing any fastener work on mechanical or electrical systems per applicable OSHA and facility lockout-tagout procedures.

Technical Specifications

• Opening Size: 18 mm
• Opening Configuration: 12 Point
• Drive Size: 3/8 inch
• Package Quantity: 1 each

Standard Information

• Brand: PROTO
• Manufacturer Part Number: j5218m