Proto JSCR10 Combination Wrench 5/16 Inch Ratcheting

Product Description

The PROTO JSCR10 is a 5/16-inch combination wrench built for trade professionals who need a reliable, compact fastening tool in tight spaces. It features a 12-point box end with a 15-degree offset head and a ratcheting mechanism, allowing forward drive without repositioning the wrench on the fastener. The wrench measures 5.5 inches in overall length and weighs 0.06 pounds, making it easy to carry on a tool belt or in a kit. Constructed from steel with a corrosion-resistant chrome finish, it meets ASME standards and carries a lifetime warranty. The tether-capable design supports use in elevated or safety-critical work environments.

This wrench is suited for maintenance, mechanical, plumbing, and electrical work where 5/16-inch fasteners are common. Its compact overall length makes it useful in confined spaces such as equipment panels, junction boxes, pipe hangers, and mechanical rooms. The ratcheting box end speeds up repetitive fastener work without requiring a separate ratchet and socket. Trades including HVAC technicians, plumbers, and electricians will find it practical as a dedicated wrench for smaller fastener sizes encountered during service calls and installations.

Key Features

• Ratcheting 12-point box end drives fasteners without repositioning
• 15-degree offset head angle improves clearance in recessed fastener locations
• Tether-capable design meets safety requirements for work at height or over equipment
• Chrome finish provides corrosion resistance for long service life
• Meets ASME standards for combination wrenches
• Lifetime warranty backed by manufacturer

Compatibility

Designed for use with 5/16-inch hex fasteners in standard SAE applications across HVAC, plumbing, electrical, and general mechanical service work.

Installation Notes

No power shutdown is required for hand tool use, but always de-energize electrical panels or mechanical systems before working on fasteners near live components. Confirm the wrench size matches the fastener before applying torque to avoid rounding. When using the tether attachment point, inspect the tether and anchor point before each use per applicable fall protection or dropped-object prevention guidelines.