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Klein Tools 63038 nut driver with blue cushion grip handle and chrome plated hollow shaft

Klein Tools

Klein Tools 63038 nutdriver

SKU CH-RFGX-AC3QV MPN 63038

A 3/8-inch hollow-shaft nut driver with a cushion-grip handle for turning long bolts and fasteners

  • Handle constructionChrome Plated
  • Product typeNut Drivers
  • Color and finishBlue
  • Key featuresCorrosion Resistant Twist Resistant Cushion Grip
  • Cushion grip reduces hand fatigue during extended use
  • Hollow shaft allows work on long bolts or threaded rod
  • Heat-treated chrome-plated steel resists wear and corrosion
  • Amber handle with colour-coded caps speeds size identification
  • Professional-grade construction built for daily job-site demands

3/8 Inch Nut Driver for Fastener Work

The Klein Tools 63038 is a 3/8 inch nut driver built for turning hex nuts and bolts. Its hollow shank allows use on long bolts or threaded rod where a standard socket cannot reach. The cushion-grip handle reduces hand fatigue during repetitive fastening tasks. It suits electricians, HVAC technicians and maintenance crews who need a reliable hand tool.

Upgrade from Fixed Shaft or Worn Drivers

This model replaces solid-shaft nut drivers that cannot clear protruding threads. The hollow design removes the depth limitation found on older or basic drivers. The jump is worth it when you regularly encounter long studs, all-thread or deep-set hardware. It also replaces drivers with rounded or stripped tips that risk damaging fastener corners.

Limits of Hollow Shank Design

The hollow shaft reduces the tool's cross-section compared to a solid driver of the same size. This lowers the maximum torque you can safely apply before the shaft twists or deforms. The chrome-plated tempered steel resists corrosion but the hollow bore remains the structural weak point. For very high-torque joints, a solid-shank driver or impact-rated socket on a wrench is the appropriate choice.

How it compares

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

Price $8.99
Cheaper than about 70% of the 415 comparable items (median $11.99).

Specifications

Product
Brand nameKLEIN TOOLS
Product typeNut Drivers
Color and finishBlue
Size & build
Handle constructionChrome Plated
Shipping weight0.45 kg
Package size25 × 25 × 25 mm

Questions about this item

Does the 3 inch hollow shaft clear long bolts on the 3/8 inch driver?

Yes, the 3 inch hollow shaft lets the nut driver slide over protruding threads so you can tighten or loosen nuts on long bolts without bottoming out.

How do I seat the chrome-plated shaft fully into the cushion-grip handle?

Push the shaft straight in until the handle cap snaps flush; the common mistake is stopping at the first resistance instead of applying firm pressure until it clicks.

When should I replace the driver if the amber handle caps fade?

Replace it when the color-coded caps become illegible or the cushion grip tears, because worn caps slow size identification and a damaged grip reduces torque control.

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