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Klein Tools yellow cushion-grip nutdriver with magnetic tip

Klein Tools

Klein Tools 646-5/16M nutdriver

SKU CH-82T0-ZW8Y7 MPN 646-5/16M

A 5/16-inch magnetic nut driver with a 6-inch hollow shank, cushion grip and corrosion-resistant finish for fastener clearance

  • Handle constructionChrome Plated
  • Product typeNut Drivers
  • Color and finishYellow
  • Key featuresTwist Resistant Corrosion Resistant Cushion Grip Magnetic Ti
  • Magnetic tip holds 5/16 inch fasteners securely
  • Cushion grip reduces hand fatigue during extended use
  • Hollow round shank provides 6 inch bolt clearance
  • Chrome plated handle resists corrosion and twisting
  • California Proposition 65 warning for cancer and reproductive harm

5/16 Inch Nut Driver

The Klein Tools 646-5/16M is a hollow round shank nut driver sized for 5/16 inch fasteners. It features a cushion grip handle with twist-resistant and corrosion-resistant properties. A magnetized tip helps hold fasteners during installation or removal. The tool is built for professional use in automotive and general maintenance tasks.

Upgrade From Basic Drivers

This nut driver replaces standard non-magnetic or fixed-shank drivers when bolt clearance and fastener retention are priorities. The hollow shank design accommodates longer bolts or threaded rod up to the shank length. The magnetic tip adds value when working in tight or vertical spaces where dropping hardware is a risk. The jump is worth it for technicians who frequently service SAE fasteners in confined areas.

Easy Install, Watch The Grip

No installation is required as this is a hand tool ready for immediate use. The cushion grip reduces hand fatigue during repetitive tasks. The chrome-plated handle resists corrosion but can become slippery when exposed to oils or solvents. Users should ensure the tip seats fully on the fastener to prevent rounding. The tool is not insulated or ESD safe, so it is unsuitable for live electrical work.

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 name646-5/16M
Product typeNut Drivers
Color and finishYellow
Size & build
Handle constructionChrome Plated

Questions about this item

How deep is the hollow shank so a 5/16-inch bolt clears it?

The hollow round shank provides 6 inches of bolt clearance for 5/16-inch fasteners.

Does the magnetic tip hold the fastener while I start it?

Yes, the magnetized tip holds 5/16-inch nuts and bolts in place during installation.

Will the cushion grip wear out and need replacement?

The cushion grip is bonded to the shank and is not designed to be replaced separately.

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