Paramount PAR37213 Hex Key 5/16 Inch Short Arm

Product Description

The PARAMOUNT PAR37213 is a short-arm hex key with a 5/16-inch hex size and a hex end configuration. Designed for driving hex socket fasteners in tight or confined spaces, this hand tool is suited for mechanical, HVAC, plumbing, and electrical service work where a full-length L-key would be impractical. The short arm style provides a compact profile with a total overall length of 3-51/64 inches (approximately 96 millimeters). At 0.132 pounds, it is lightweight and easy to carry in a tool pouch or kit. It is sold individually and is typically purchased in multiples of 10.

This hex key is appropriate for general trade use across residential and commercial service environments. HVAC technicians, plumbers, electricians, and mechanical contractors commonly use short-arm hex keys to access recessed set screws, adjustment bolts, and fasteners on equipment panels, valve assemblies, motor mounts, and terminal covers. The short arm format is particularly useful when overhead clearance or lateral space is restricted around equipment housings.

Key Features

• 5/16-inch hex size for a wide range of standard hex socket fasteners
• Short arm style for use in confined or restricted spaces
• Hex end type for direct engagement with hex socket fasteners
• Overall length of 3-51/64 inches (96 millimeters) for compact handling
• Lightweight at 0.132 pounds for easy transport and daily carry
• Inch measurement system for compatibility with standard US fastener specifications

Compatibility

Designed as a standard 5/16-inch short-arm hex key for use with hex socket fasteners conforming to inch-based specifications across residential and commercial trade applications.

Installation Notes

This tool is used by licensed tradespeople across HVAC, plumbing, and electrical disciplines. Always de-energize or shut off equipment before accessing fasteners near live electrical components, refrigerant lines, or pressurized systems. Ensure the hex key is fully seated in the fastener socket before applying torque to avoid rounding the fastener head. Follow applicable codes and equipment manufacturer procedures when servicing trade equipment.