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Blue Klein Tools 1/2 inch hex nut driver with cushioned grip and hollow shaft

Klein Tools

Klein Tools 646-1/2 1/2" Hex Nut Driver

SKU CH-4RQK-WYZAB MPN 646-1/2

Drives 1/2 inch hex nuts with a 6 inch hollow shaft and cushioned grip

  • TypeNut Drivers
  • Color/FinishBlue
  • 1/2" hex tip drives common SAE fasteners
  • 6" hollow shank reaches recessed bolts
  • Cushion grip reduces hand fatigue during extended use
  • Non-magnetic tip avoids unwanted metal debris
  • Blue finish identifies size quickly in tool storage

1/2" Hex Nut Driver for SAE Fasteners

The Klein Tools 646-1/2 is a hollow-shaft nut driver sized for 1/2 inch SAE hex fasteners. Its 6 inch shank reaches recessed bolts and studs where a standard socket cannot fit. The cushion-grip handle provides comfort and torque control for automotive, electrical and maintenance tasks. It is built for professionals who need reliable engagement on inch-sized hardware.

Sustained Torque Through Hollow Shank

The hollow round shank allows the driver to slide over long bolts or threaded rod without bottoming out, so turning force stays consistent through the full depth of the fastener. The non-magnetic tip avoids attracting metal shavings that could interfere with seating. Because the shaft is not insulated or ESD-rated, it suits general mechanical work rather than live electrical panels. The steel shank resists rounding under repeated high-torque cycles.

Replaces Shallow Sockets in Deep Recesses

This driver upgrades a toolkit when a 1/2 inch socket cannot reach a nut buried inside a housing, engine bay or junction box. It is not for jobs requiring insulated shafts, magnetic retention or metric fastener sizes. Buyers who need to drive 1/2 inch hex heads on extended threads will find the 6 inch clearance essential, while those working only on exposed bolts may prefer a standard ratchet and socket.

Highlights

  • 1/2" hex tip drives common SAE fasteners
  • 6" hollow shank reaches recessed bolts
  • Cushion grip reduces hand fatigue during extended use
  • Non-magnetic tip avoids unwanted metal debris
  • Blue finish identifies size quickly in tool storage

Specifications

BrandKlein Tools
Model646-1/2
TypeNut Drivers
Color/FinishBlue

Questions about this item

Does the 646-1/2 nut driver generate heat or vibration during extended use?

No, the 646-1/2 is a manual hand tool with no motor or power source, so it produces no heat, noise or vibration regardless of how long you use it.

What fastener size must I already have for the 646-1/2 to engage properly?

The 646-1/2 is sized for 1/2 inch hex nuts and bolts, so you need fasteners with a 1/2 inch across-flats dimension.

Will the 6-inch hollow shaft of the 646-1/2 reach recessed bolts on older equipment?

Yes, the 6-inch hollow shank provides deep bolt clearance, allowing the driver to access recessed or long-threaded fasteners on legacy machinery.

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