Klein Tools
Klein Tools 646-3/8 3/8" nutdriver
A 3/8 inch heavy-duty nut driver with a hollow shaft and six-inch shank for deep fastener access
- TypeNut Drivers
- 3/8" nut driver fits common fasteners
- 6" hollow shank reaches recessed hardware
- 9-3/4" overall length gives comfortable leverage
- Heavy-duty construction withstands demanding use
3/8-Inch Heavy-Duty Nut Driver
The Klein Tools 646-3/8 is a 3/8-inch heavy-duty nut driver built for fastening hex nuts and bolts. Its hollow shaft allows use on long studs or threaded rod where a solid driver cannot reach. The 6-inch shank provides access to recessed fasteners in deep cavities. The overall length measures 9-3/4 inches for leverage and reach.
Target Users and Limitations
This tool suits technicians and tradespeople who drive 3/8-inch hex fasteners in deep or stud-mounted applications. It is not suited for anyone needing a different drive size, a shorter shank for tight clearances, or a ratcheting mechanism for speed. Buyers requiring insulated handles for live electrical work or a full nut driver set should look elsewhere.
Highlights
- 3/8" nut driver fits common fasteners
- 6" hollow shank reaches recessed hardware
- 9-3/4" overall length gives comfortable leverage
- Heavy-duty construction withstands demanding use
Specifications
| Brand | Klein Tools |
|---|---|
| Model | 646-3/8 |
| Type | Nut Drivers |
Questions about this item
How do I install the 646 nut driver onto a fastener, and what step is often missed?
Align the hollow shaft over the nut or bolt head and push straight on until fully seated; the step people skip is confirming the driver is completely flush before applying torque.
What maintenance or replacement will the 646 nut driver need later?
Inspect the hollow shaft for rounding or cracks after heavy use; replace the tool if the drive end no longer grips the fastener securely.
Also in this aisle
People compared these
Same shelf, same checkout — eight coins and a 30-minute rate lock.
