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Single-piece metric hex key, 4 mm tip, 150 mm long arm, unfinished metal finish

Ampco

Ampco WT-4MM Hex Key 4 mm 150 mm

SKU CH-P9ND-E5GFS

Metric hex key with a 4 mm tip, 150 mm long arm, 115 mm short arm, non-sparking, non-magnetic and corrosion-resistant

  • Product typeHex/Torx Keys
  • Non-sparking safety for hazardous environments
  • Non-magnetic property prevents interference with sensitive equipment
  • Corrosion-resistant finish extends tool lifespan
  • 150 mm long arm provides extra reach and leverage
  • 115 mm short arm allows use in confined spaces

Precision Metric Hex Key

The Ampco WT-4MM is a non-sparking, non-magnetic hex key designed for maintenance tasks where ignition risk or magnetic interference must be avoided. Its unfinished metric tip fits 4 mm fasteners in industrial, marine or hazardous-environment assemblies.

Build Integration

The 150 mm long arm provides reach into recessed fittings while the 115 mm short arm allows leverage in tighter clearances. Corrosion-resistant construction suits damp or chemically exposed settings, and the single-tip format keeps the tool lightweight for overhead work.

Upgrade Context

This key replaces standard steel hex drivers when non-sparking and non-magnetic properties are required by safety protocol. It does not serve applications needing insulated handles, tether attachment points or multiple tip sizes on one tool.

How it compares

Measured against everything we stock in Pliers, Wrenches & Gripping Tools, at today’s prices. Recalculated every night.

Price $67.99
Pricier than about 82% of the 2,110 comparable items (median $23.99).

Specifications

Product
Brand nameAMPCO
Product typeHex/Torx Keys

Questions about this item

How long is the long arm before it becomes hard to reach deep fasteners?

The long arm measures 150 mm, giving extra reach for recessed bolts.

Does the tool get hot or spark during extended use in hazardous areas?

It is non-sparking and non-magnetic, so it stays cool and safe in flammable environments.

What drive size or handle must I already have to use this hex key?

No separate drive or handle is needed; the 4 mm tip is used directly by hand.

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