Williams Comfort Products HK-4mm L-type Hex Key 4MM

Product Description

The WILLIAMS COMFORT PRODUCTS HK-4mm is an L-type hex key sized at 4 millimeters, sold in bags of 25 individual keys. L-type hex keys feature the standard short-arm and long-arm bend geometry that gives technicians the choice between high-torque driving on the short end or extended reach on the long end. This style of hex key is a staple hand tool for HVAC, plumbing, electrical, and general mechanical service work where fastener access is limited. The 25-piece bag format makes it practical for stocking a parts van, a service shop bench, or a tool crib so technicians always have a fresh key available.

The HK-4mm is suited for residential and light commercial service applications where 4 millimeter hex socket fasteners are common. Typical install scenarios include tightening set screws on motor couplings, fan blade hubs, valve stems, and equipment access panels. The bag quantity of 25 is well matched to shop stocking, field replenishment kits, and contractor supply orders.

Key Features

• L-type geometry provides both high-torque short-arm and extended-reach long-arm drive options
• 4 millimeter hex size fits standard metric socket-head fasteners common in HVAC and mechanical equipment
• Sold in bags of 25 for convenient shop or van stocking
• Lightweight at 0.02 pounds per key for easy carry in a tool pouch or apron

Compatibility

Designed for use with any metric hex socket fastener requiring a 4 millimeter drive, as commonly found on HVAC equipment, pumps, valves, and general mechanical assemblies.

Installation Notes

Hex keys should be used by qualified service technicians familiar with the fastener torque requirements of the equipment being serviced. Always ensure power is off and equipment is de-energized or depressurized before loosening or tightening fasteners on HVAC, plumbing, or mechanical systems. Inspect the hex key tip for wear or rounding before use, as a damaged tip can strip fastener sockets. Replace worn keys promptly to avoid fastener damage.

Technical Specifications

• Hex Size: 4 millimeters
• Type: L-Type
• Quantity Per Bag: 25
• Weight: 0.02 pounds
• UPC: 662459108159

Standard Information

• Brand: WILLIAMS COMFORT PRODUCTS
• Manufacturer Part Number: HK-4mm