Klein Tools 646 Nut Driver, 6-...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$12.97
Klein Tools 646 Nut Driver, 6-Inch Hollow Shaft

Klein Tools 646 Nut Driver, 6-Inch Hollow Shaft

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Model: 646-1/4

In Stock (leaves warehouse same day if ordered before 3pm ET)

$12.97
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1/4-Inch Nut Driver with 6-Inch Hollow Shaft

  • Warnings

    • NOT insulated. Will NOT protect against electrical shock.
    • Always wear approved eye protection.

  • Features

    • Meets or exceeds applicable ASME / ANSI specifications
    • Cushion-Grip™ handle allows for greater torque and comfort
    • Tip-Ident® quickly identifies nut driver and size
    • Full hollow shafts facilitate work on stacked circuit boards or other long bolt applications
    • Handle end is also color coded for easy identification
    • Premium chrome plated for smooth feel and corrosion resistance
    • Made in USA
    • Reaches into deep recesses and fits over extra-long bolts and studs
    • Internal flanges provide solid, twist-resistant shaft anchor


646-1/4 - spec sheet

Product Specs

Department:
Electrical
Insulated:
No
Measurement Standard:
SAE
Product Type:
Nut Driver
Shaft Length:
6" (15.2 cm)
Product Width:
2.3670 in
Magnetic:
No
Product Subgroup:
Screwdrivers & Drivers
Product Group:
Hand Tools

Klein Tools 646-1/4 – Frequently Asked Questions

1) Can a Klein 646 nut driver run down a long bolt or stud, or does the shaft bottom out?
The 646 has a full hollow shaft, 6 inches long, so the bolt or stud passes up inside the shaft instead of stopping the driver. That is what makes it the tool for stacked circuit boards, deep recesses, and extra-long threaded studs where a solid-shaft driver would stall as soon as the thread filled the socket.
2) Is the Klein 646 nut driver safe to use on live electrical work?
No. The 646 is not insulated and will not protect against electrical shock. De-energize the circuit before using it. If you need to work on or near energized parts, you need a 1000V insulated nut driver instead, not this one. Eye protection is called for either way.
3) What sizes does the Klein 646 hollow-shaft nut driver come in, and are they metric or SAE?
Three SAE (inch) sizes: 1/4-inch (646-1/4), 11/32-inch (646-11/32), and 1/2-inch (646-1/2). There is no metric option in the 646 hollow shaft, so if you are working on metric hex heads you need a metric driver line.
4) Will the Klein 646 hold a loose nut on the tip while I start it one-handed?
No, the 646 is not magnetic. Overhead or blind starts need a second hand or a magnetized driver. The trade-off is deliberate: a hollow shaft can't hold a magnet insert because the bore has to stay clear for the bolt to pass through.
5) Does the Klein 646 nut driver meet a recognized tool standard, and where is it made?
The 646 meets or exceeds applicable ASME/ANSI specifications and is made in the USA. For MRO and government buyers who need domestic-origin hand tools on a purchase order, that origin statement is on the manufacturer's own product data.
6) How do you tell the three 646 drivers apart quickly in a pouch?
Two ways. Tip-Ident marks the size right at the tip, and the end of the Cushion-Grip handle is color coded, so the size reads off the butt of the handle when the drivers are standing in a pouch or bucket. Useful when 1/4, 11/32 and 1/2 are all riding together.
7) Is the shaft on the Klein 646 pressed into the handle, and will it spin loose under torque?
The handle uses internal flanges that anchor the shaft against twisting, and the Cushion-Grip handle is sized to let you put real torque on a fastener. The shaft is premium chrome plated, which also keeps corrosion off a tool that lives in a damp van or a service bag.
How fast can I get the Klein Tools 646-1/4 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Klein Tools 646-1/4 come with a warranty?
Absolutely. The Klein Tools 646-1/4 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Klein Tools 646-1/4?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Klein Tools 646-1/4 from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.
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