Klein Tools
Klein Tools 646-5/16 5/16-Inch Nut Driver 6-Inch Hollow Shaft pneumatic accessory
5/16-inch hollow-shaft nut driver with 6-inch bolt clearance and cushion grip
- Hollow shaft clears 6-inch bolts for deep reach
- 5/16-inch SAE tip fits common fastener size
- Cushion grip reduces hand fatigue during extended use
- Non-magnetic tip prevents unwanted metal debris attraction
- ESD-safe design protects sensitive electronic components
5/16-Inch Nut Driver with 6-Inch Hollow Shaft
This Klein Tools nut driver fits 5/16-inch SAE fasteners and features a six-inch hollow round shank that provides bolt clearance for longer studs. The cushion grip adds comfort during repetitive tightening or loosening tasks. It is a non-magnetic, non-insulated hand tool suited for automotive, electrical and general mechanical work where a deep-reach driver is required.
Installation and common issues
Select the driver that matches the fastener size, seat the tip fully on the nut or bolt head, and apply steady torque by hand or with a compatible power tool. The hollow shaft allows the fastener to pass through, but debris or damaged threads can prevent full engagement. The cushion grip is not rated for electrical insulation, so do not use it on live circuits. Excessive force on corroded hardware may round the fastener corners.
Capacity and headroom
The tool handles standard 5/16-inch SAE hex fasteners and clears bolts up to the full six-inch shank length, making it practical for deep-set or threaded-rod applications. It lacks a magnetic tip, so the fastener must be held or started by hand in tight spaces. For larger hex sizes, smaller drives, or insulated work, a different driver is required.
Highlights
- Hollow shaft clears 6-inch bolts for deep reach
- 5/16-inch SAE tip fits common fastener size
- Cushion grip reduces hand fatigue during extended use
- Non-magnetic tip prevents unwanted metal debris attraction
- ESD-safe design protects sensitive electronic components
Specifications
| Brand | Klein Tools |
|---|
Questions about this item
How can I confirm the 646 5/16-inch nut driver is working correctly after attaching it to my pneumatic tool?
The 6-inch hollow shaft should seat fully on the 5/16-inch fastener and turn smoothly without wobble; the non-magnetic tip will not hold the bolt, so you must keep the driver aligned while driving.
What comes in the box with the Klein Tools 646 nut driver and what must I supply?
The package contains only the 5/16-inch hollow-shaft nut driver; you must provide a compatible pneumatic or power driver and any required sockets or adapters.
Which version of the 646 nut driver should I choose for a 5/16-inch SAE fastener?
Select the 646-5/16 model with a 6-inch hollow round shank; it is sized for 5/16-inch fasteners, non-magnetic, non-insulated, and not ESD-safe.
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