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Klein Tools 646-3/8 nutdriver with 6 inch hollow shaft and 9-3/4 inch overall length

Klein Tools

Klein Tools 646-3/8 3/8" nutdriver

SKU CH-37JH-D1CBS MPN 646-3/8

A 3/8 inch heavy-duty nut driver with a hollow shaft and six-inch shank for deep fastener access

  • Product typeNut Drivers
  • 3/8" nut driver fits common fasteners
  • 6" hollow shank reaches recessed hardware
  • 9-3/4" overall length gives comfortable leverage
  • Heavy-duty construction withstands demanding use

3/8-Inch Heavy-Duty Nut Driver

The Klein Tools 646-3/8 is a 3/8-inch heavy-duty nut driver built for fastening hex nuts and bolts. Its hollow shaft allows use on long studs or threaded rod where a solid driver cannot reach. The 6-inch shank provides access to recessed fasteners in deep cavities. The overall length measures 9-3/4 inches for leverage and reach.

Target Users and Limitations

This tool suits technicians and tradespeople who drive 3/8-inch hex fasteners in deep or stud-mounted applications. It is not suited for anyone needing a different drive size, a shorter shank for tight clearances, or a ratcheting mechanism for speed. Buyers requiring insulated handles for live electrical work or a full nut driver set should look elsewhere.

How it compares

Measured against everything we stock in Screwdrivers, Nut Drivers & Hex Keys, at today’s prices. Recalculated every night.

Price $9.99
Cheaper than about 60% of the 415 comparable items (median $11.99).

Specifications

Product
Brand nameKlein Tools
Model name646-3/8
Product typeNut Drivers

Questions about this item

How do I install the 646 nut driver onto a fastener, and what step is often missed?

Align the hollow shaft over the nut or bolt head and push straight on until fully seated; the step people skip is confirming the driver is completely flush before applying torque.

What maintenance or replacement will the 646 nut driver need later?

Inspect the hollow shaft for rounding or cracks after heavy use; replace the tool if the drive end no longer grips the fastener securely.

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