Wiha 33441 Insulated T-handle Hex Key 4 Mm

Product Description

The WIHA 33441 is an insulated T-handle hex key designed for driving 4 mm hex fasteners in environments where electrical hazard protection is required. The T-handle arm style delivers high torque with controlled hand pressure, making it well suited for tight-quarters fastener work on electrical enclosures, motor terminal boxes, and switchgear. Built from Chrome Vanadium Molybdenum steel, the blade measures 150 mm in length with an overall length of 176 mm. The insulated construction meets VDE, EN/IEC 60900, and NFPA 70E requirements, making this tool appropriate for live-panel service work up to the rated voltage limits of those standards.

This hex key is used by licensed electricians, industrial maintenance technicians, and instrumentation specialists working on equipment where incidental contact with energized components is a risk. The T-handle format is common in motor control center (MCC) work, panel assembly, and equipment commissioning where repetitive fastener driving demands ergonomic grip and torque transfer. The metric 4 mm drive size is standard across a wide range of European and domestic electrical and HVAC equipment fasteners.

Key Features

• Insulated construction rated to EN/IEC 60900 and NFPA 70E for electrical hazard protection
• Chrome Vanadium Molybdenum steel blade for durability and torque resistance
• T-handle arm style for high torque output and comfortable grip
• 4 mm hex drive in metric sizing, 150 mm blade length
• 176 mm overall length fits standard tool pouches and kit rolls
• Meets ASTM F1505-10, CSA, DIN 7437, and VDE 0682/Part 201 standards

Compatibility

Designed as an OEM-style insulated hand tool for use with 4 mm hex fasteners found on electrical enclosures, motor terminal covers, and related equipment requiring IEC 60900-compliant tooling.

Installation Notes

This tool is intended for use by qualified electricians following applicable codes including NFPA 70E and NEC arc-flash and shock hazard requirements. Always verify the insulation rating is appropriate for the voltage level present before using on or near energized equipment. Inspect the insulation sleeve for cracks, cuts, or damage before each use and remove the tool from service if any defect is found. Do not use impact drivers or apply torque beyond what the hand grip naturally provides.