Paramount PAR17513 Ball End Hex Key 5/16 Inch Long Arm

Product Description

The PARAMOUNT PAR17513 is a 5/16-inch ball end hex key with a long arm design and an overall length of 6 inches. Constructed from steel, this hex key is built for repeated use in tight spaces where standard L-keys struggle to reach. The ball end tip allows engagement with fasteners at angles up to 25 degrees, reducing the need to reposition the tool when working around obstructions. It is well suited for HVAC equipment panels, motor mounts, compressor housings, pump assemblies, and similar mechanical hardware that uses socket head cap screws. Technicians in HVAC, plumbing, and mechanical service trades keep this size on hand as a standard part of their hex key set.

The PAR17513 is used in residential and light commercial service applications where 5/16-inch hex fasteners are common. Typical scenarios include tightening or removing socket head screws on equipment access panels, motor brackets, fan assemblies, and pipe support hardware. The long arm configuration provides increased torque compared to a short arm key, making it practical for fasteners that have been seated firmly or exposed to corrosion over time.

Key Features

• Ball end tip allows off-axis engagement for improved access in confined areas
• Long arm style increases available torque over short arm designs
• 5/16-inch hex size suits standard socket head cap screws found on HVAC and mechanical equipment
• 6-inch overall length provides reach in deep or recessed fastener locations
• Steel construction for durability under repeated torque loading

Compatibility

Designed for use with 5/16-inch socket head cap screws and set screws in standard inch-measurement applications across HVAC, plumbing, and general mechanical service work.

Installation Notes

This tool is used by HVAC technicians, plumbers, and mechanical service professionals. De-energize and lock out equipment before removing or reinstalling fasteners on electrical or mechanical assemblies. The ball end is intended for light to moderate torque at an angle — use the straight end of the key for final tightening or high-torque applications to avoid rounding the fastener. Inspect the tip for wear regularly, as a damaged ball end can slip and damage fastener heads.