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Klein Tools 646 3/8 inch magnetic nut driver with 6 inch shaft and cushion grip

Klein Tools

Klein Tools 646 3/8 in magnetic tip nut driver 6 in shaft

SKU CH-FRMJ-NMP36

Magnetic tip holds 3/8 in fasteners securely while the 6 in hollow shaft clears long bolts

  • Magnetic tip holds 3/8 in fasteners securely
  • 6 in shaft reaches deep or recessed bolts
  • Hollow round shank clears long threads easily
  • Cushion grip reduces hand fatigue during extended use
  • Built by Klein Tools for professional durability

Magnetic Tip Nut Driver

The Klein Tools 646 3/8 in magnetic tip nut driver has a six inch hollow round shank designed to hold SAE fasteners securely. Its cushion grip provides comfort during extended use. The magnetised tip helps retain bolts and nuts in awkward positions. This hand tool is built for professional and DIY applications.

Suited for SAE Fastening Tasks

This driver suits technicians and hobbyists who regularly install or remove 3/8 inch SAE nuts and bolts. The magnetic tip and six inch bolt clearance speed up work in tight spaces. It is not intended for insulated electrical work or ESD sensitive environments. Buyers needing those protections should look at something else.

Capacity and Headroom

The six inch shaft length and hollow round design give enough reach and bolt clearance for common automotive and maintenance jobs. The tool handles standard 3/8 inch fasteners without slipping. It runs out of reach when deeper recessed hardware requires a longer shank or when metric sizes are needed.

How it compares

Measured against everything we stock in Bits, Hole Saws & Accessory Kits, at today’s prices. Recalculated every night.

Price $8.99
Cheaper than about 90% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameKlein Tools

Questions about this item

What power tool chuck size is needed for the 6 in shaft on this nut driver?

The 6 in hollow round shank fits standard 3/8 in and larger drill chucks, so a 3/8 in or 1/2 in chuck will hold it securely.

Will the magnetic tip hold a 3/8 in fastener while I start it in a tight automotive bracket?

Yes, the magnetized tip is designed to hold 3/8 in fasteners, giving one-handed starts in confined engine-bay spaces.

How can I confirm the tip is still magnetised after a day of use?

Touch the tip to a loose 3/8 in nut; if it lifts and holds the nut without falling, the magnetic tip is working as intended.

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