Proto JSCV10 Combination Wrench 5/16 Inch Ratcheting

Product Description

The PROTO JSCV10 is a 5/16-inch combination wrench designed for professional trade use where access is tight and repetitive fastening is common. Built from steel with a corrosion-resistant chrome finish, it features a 12-point ratcheting box end with a 15-degree offset head angle, allowing incremental rotation without repositioning the wrench on the fastener. The overall length is 5.5 inches and the part weighs 0.08 pounds, making it a compact, lightweight tool for confined spaces. It is tether capable, supporting drop-prevention requirements in elevated or safety-critical work environments. The reversing ratchet mechanism adds efficiency on both tightening and loosening tasks.

This wrench suits licensed electricians, plumbers, HVAC technicians, and general mechanical trades working on equipment panels, pipe fittings, valve stems, and structural fasteners where a 5/16-inch drive is required. The tether-ready design makes it appropriate for overhead work, aerial platforms, and industrial facilities with tool-drop control programs. The chrome finish resists corrosion in damp or outdoor service environments, including rooftop HVAC installations and exposed mechanical rooms.

Key Features

• 12-point ratcheting box end allows fastener engagement without full wrench rotation
• Reversing ratchet mechanism for both tightening and loosening without removing the wrench
• 15-degree head offset angle improves clearance in tight or recessed fastener locations
• Tether capable for compliance with tool-drop prevention programs
• Corrosion-resistant chrome finish suited for damp and outdoor service conditions
• Meets ASME B107.100-2010 standard for combination wrenches

Compatibility

Designed as an OEM-style replacement or direct-use combination wrench for any application requiring a 5/16-inch fastener drive with a ratcheting box end.

Installation Notes

Install and remove fasteners using the ratcheting box end to reduce hand travel in confined spaces. Power down or de-energize equipment before servicing fasteners on electrical panels or HVAC components. When working at height, attach the tether point to an approved lanyard anchor before use. Inspect the ratchet mechanism for smooth engagement before each use and do not apply extension bars or pipe cheaters to this wrench.