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Klein Tools yellow nut driver with hollow round shank and cushion grip

Klein Tools

Klein Tools 646-5/8 Nut Driver 5/8 in Hex 11 3/8 in L

SKU CH-3X60-FHJJK MPN 646-5/8

A 5/8-inch nut driver with a hollow round shank and cushion grip for SAE fasteners

  • TypeNut Drivers
  • Color/FinishYellow
  • 5/8 in hex tip fits common fasteners
  • 6 in bolt clearance reaches deep nuts
  • 11 3/8 in overall length gives extra leverage
  • Cushion grip reduces hand fatigue during extended use
  • Hollow round shank design for standard applications

Nut Driver for 5/8 in Fasteners

This Klein Tools 646-5/8 nut driver fits 5/8 in hex fasteners. The hollow round shank provides 6 in of bolt clearance for reaching recessed hardware. A yellow cushion grip adds comfort during extended use. The tool is non-magnetic and not ESD safe.

Build Fit and Clearance

The 6 in shank length reaches past obstructions that block shorter drivers. Hollow construction slides over long studs without bottoming out. Non-magnetic tip avoids attracting metal shavings in sensitive assemblies. No insulation means the tool is not rated for live electrical work.

Upgrade from Shorter or Solid Shanks

Replaces stubby nut drivers when depth is the limiting factor. The jump is worth it when bolts sit deeper than 6 in or when studs protrude past a solid shaft. Buyers who need insulated shafts or magnetic retention should select a different model.

Highlights

  • 5/8 in hex tip fits common fasteners
  • 6 in bolt clearance reaches deep nuts
  • 11 3/8 in overall length gives extra leverage
  • Cushion grip reduces hand fatigue during extended use
  • Hollow round shank design for standard applications

Specifications

BrandKlein Tools
Model646-5/8
TypeNut Drivers
Color/FinishYellow

Questions about this item

How deep can the 6 in bolt clearance reach on a long stud?

The hollow round shank provides 6 in of bolt clearance so the nut driver slides over extended threads without bottoming out.

Does the cushion grip stay comfortable during a full day of repetitive fastening?

The yellow cushion handle is shaped to reduce hand fatigue during prolonged use and the non‑magnetic tip avoids unwanted metal shavings.

Is a separate insulated driver required for live electrical work with this nut driver?

This model is not insulated and carries no ESD rating, so a dedicated insulated nut driver must be used for energised circuits.

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