Proto J5216MH 16mm 6-point 3/8 Drive Hand Socket

Product Description

The PROTO J5216MH is a 16 mm, 6-point hand socket designed for 3/8 inch drive ratchets and breaker bars. Built to standard length, it features a chrome-plated finish that resists corrosion and simplifies cleaning in shop and field environments. The 6-point contact pattern applies torque to the flat faces of fasteners, reducing the risk of rounding under load. This socket is appropriate for automotive, mechanical, and general trade use where a reliable metric hand socket is required for everyday fastener work.

This socket fits standard 3/8 inch drive tooling and is suited for residential and commercial maintenance applications, automotive service, HVAC equipment assembly, and light industrial mechanical work. It is intended for manual use with ratchets, extensions, and breaker bars. The 16 mm size is a common metric fastener size encountered across a wide range of equipment and machinery servicing tasks.

Key Features

• 16 mm socket size fits common metric fasteners in automotive and mechanical applications
• 6-point design engages fastener flats to reduce rounding compared to 12-point patterns
• 3/8 inch drive compatible with standard ratchets, extensions, and adapters
• Standard length profile suitable for general-access fastener locations
• Chrome-plated finish provides corrosion resistance and easy wipe-down maintenance

Compatibility

Designed for use with standard 3/8 inch drive ratchets, breaker bars, and extensions. Fits any 3/8 inch drive tool following standard square drive dimensions.

Installation Notes

Hand sockets should be installed onto the drive tool until the detent ball fully seats to prevent slippage during use. Inspect the socket for cracks or wear before each use and remove from service if deformation is present. Always ensure the fastener is fully engaged in the socket before applying torque to avoid rounding. Do not use hand sockets with impact drivers unless the socket is rated for impact use.