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A silver 12-point 21 mm hex socket with a 1/2 inch drive

Wiha Tools

Wiha Tools 31621 1/2 in Drive 21 mm Hex Socket

SKU CH-RAGT-2MDY3

Insulated 12-point 21 mm socket with 1/2 in drive meets ASTM F1505, CSA, EN/IEC 60900, NFPA70E and VDE standards

  • 12-point socket profile grips flats securely
  • 21 mm metric size fits standard fasteners
  • 1/2 in drive compatible with common ratchets
  • Insulated to EN/IEC 60900 for electrical safety
  • Alloy steel chrome finish resists corrosion

Professional Insulated Socket for Electrical Work

The Wiha Tools 31621 is a 1/2 in drive 21 mm metric hex socket built for professional electricians and maintenance technicians. It features a 12-point alloy steel construction with a chrome finish for standard hand operation.

Suited for Insulated Fastener Access, Not Impact Use

This socket suits users who require VDE and ASTM F1505 compliant insulated tools for accessing fasteners on live electrical systems. It is not intended for technicians who need impact-rated sockets for powered driver applications.

21 mm 12-Point Hex Opening on 1/2 in Drive

The single specification that decides fit is the 21 mm 12-point hex opening combined with a 1/2 in square drive. Verify the fastener size and drive compatibility before purchase.

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Price $22.99
Typical for this category: the median of 2,748 items is $20.99.

Specifications

Product
Brand nameWIHA

Questions about this item

How do I install the 1/2 in drive 21 mm hex socket on my ratchet, and what step is often missed?

Align the 1/2 in square drive with the ratchet anvil and press firmly until the detent ball clicks into the socket groove; the missed step is forgetting to verify the ball is fully seated before applying torque.

What maintenance or replacement will the 21 mm insulated socket need over time?

Inspect the chrome finish and insulation before each use; replace the socket if the coating shows cracks, chips, or wear that exposes the alloy steel underneath.

What limit appears first when the 12-point socket sees sustained high-torque work?

The socket is not impact rated, so the chrome plating and 12-point geometry will deform or round off before the alloy steel core reaches its yield point.

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