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Gray Tools M604-I 4mm insulated socket orange yellow layers

Gray Tools

Gray Tools M604-I 4mm 1/4" Drive 6 Point 1000V Insulated tool storage

SKU CH-B0CQ-FHZYM

A 4 mm insulated 1/4" drive socket with dual-colour safety layers tested to 1000 V

  • Insulated to 1000 V for live-circuit safety
  • Dual-layer orange and yellow coating shows damage at a glance
  • 6-point 4 mm hex fits fasteners securely
  • Tested to ASTM F1505 for verified protection
  • 1/4-inch drive works with standard ratchets

4mm 1/4" Drive Insulated Socket

The Gray Tools M604-I is a 4mm hex socket with a 1/4-inch drive and six-point geometry. It carries a 1000V insulation rating for work on live electrical systems. Each piece is individually tested to ASTM F1505 standards. The tool suits electricians and technicians who require verified dielectric protection.

Dual-Layer Insulation Visual Indicator

An orange outer insulation layer covers a yellow inner layer that acts as a visual safety indicator. Damage to the orange surface reveals the yellow layer, signalling that the socket must be replaced. This design supports routine inspection without specialised equipment. The insulation system helps maintain user protection during normal use.

Sustained High-Voltage Application

Under continuous load at rated voltage the dual-layer construction maintains its dielectric integrity per the ASTM F1505 test protocol. The six-point drive distributes torque evenly across fastener flats, reducing the risk of rounding during prolonged fastening cycles. The tool is not intended for applications exceeding the 1000V rating or for use with impact drivers.

Highlights

  • Insulated to 1000 V for live-circuit safety
  • Dual-layer orange and yellow coating shows damage at a glance
  • 6-point 4 mm hex fits fasteners securely
  • Tested to ASTM F1505 for verified protection
  • 1/4-inch drive works with standard ratchets

Specifications

BrandGRAY TOOLS

Questions about this item

How do I install the 4 mm 6-point socket on a 1/4" drive ratchet, and what step do people often miss?

Press the socket squarely onto the ratchet anvil until the ball detent clicks; the step many miss is verifying both orange and yellow insulation layers are intact before first use.

What maintenance or replacement will the M604-I insulated socket need over time?

Inspect the dual-layer insulation before every job; if the yellow indicator layer becomes visible through the orange outer layer, replace the socket immediately.

What limit appears first when the 1000 V insulated socket sees sustained heavy use?

The insulation integrity limit — once the yellow safety layer shows through the orange coating, the socket no longer meets ASTM F1505 protection and must be retired.

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