Proto J49903/16ST Hand Hex Bit Socket 3/8 in Drive

Product Description

The PROTO J49903/16ST is a hand hex bit socket designed for driving 3/16-inch hex fasteners using a 3/8-inch square drive ratchet or breaker bar. It measures 1-13/16 inches in overall length with a 3/4-inch bit length, making it a compact option for working in tighter fastener access points. PROTO tools are built to professional trade standards and are commonly specified in mechanical, HVAC, and industrial service work where precise hex drive engagement matters. This socket is sold individually and fits standard 3/8-inch drive tool sets.

This hex bit socket is suited for residential and commercial mechanical service applications where hex-head fasteners or set screws require a socket-driven approach rather than a T-handle or L-key. Typical install scenarios include equipment panel fasteners, motor set screws, valve packing nuts, and similar hex-drive hardware encountered during HVAC, plumbing, and general mechanical service calls. The 3/16-inch hex size targets smaller fasteners common in light equipment and control component assemblies.

Key Features

• 3/8-inch square drive compatible with standard ratchets, extensions, and torque wrenches
• 3/16-inch hex bit for precise engagement on smaller hex fasteners and set screws
• Compact 1-13/16-inch overall length suits confined fastener locations
• 3/4-inch bit length provides adequate fastener engagement depth
• Single-piece construction for direct ratchet-driven hex fastener removal and installation

Compatibility

Designed as a standard 3/8-inch drive hex bit socket for use with any 3/8-inch drive ratchet, extension, or torque wrench accepting bit-style sockets.

Installation Notes

This socket is installed and used by HVAC technicians, plumbers, electricians, and general mechanical service professionals. Ensure the drive tool is rated for the torque required by the fastener application before use. Inspect the hex bit for wear before engaging fasteners to avoid rounding. Follow applicable equipment service manuals and lockout/tagout procedures when servicing powered equipment.