Paramount PAR37160 Hex Key 4.00 Mm Long Arm

Product Description

The PARAMOUNT PAR37160 is a long-arm hex key designed for fastener-drive applications requiring a 4.00 mm metric hex end. Constructed from steel, it delivers the torsional strength needed for repetitive torque applications on hex socket fasteners. The long arm style provides extended reach into recessed fastener locations and, when flipped, the short arm delivers increased torque leverage. Overall length is 4-19/64 inches (4.3000 inches decimal). This tool is a standard in the service kits of HVAC technicians, plumbers, electricians, and mechanical contractors who work with metric hex fasteners on equipment panels, brackets, and fittings.

The PAR37160 is suited for general maintenance and installation work across commercial and residential trade applications. It is commonly used when servicing HVAC equipment access panels, pump assemblies, electrical enclosures, and plumbing fixture hardware that use 4.00 mm metric hex socket fasteners. The long arm geometry is particularly useful in tight equipment cabinets where a standard-length key cannot gain a full swing arc.

Key Features

• 4.00 mm metric hex end for standard M5 and similar metric hex socket fasteners
• Long arm style provides extended reach into recessed fastener bores
• Steel construction for durability under repeated torque loading
• Overall length of 4-19/64 inches (4.3000 inches) fits standard hex key holders and pouches
• Metric system sizing for equipment manufactured to metric fastener standards

Compatibility

Designed as a standard metric hex key for use with 4.00 mm hex socket fasteners across trade and mechanical service applications.

Installation Notes

This tool is used by licensed HVAC technicians, plumbers, electricians, and general mechanical contractors. Always de-energize equipment and shut off fluid supply before loosening or tightening fasteners on live systems. Ensure the hex key is fully seated in the fastener socket before applying torque to prevent rounding. Inspect the key for wear or deformation before use and replace if tip geometry is compromised.