Klein Tools 635-3/8 3/8-Inch H...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$71.09
$18.10
Klein Tools 635-3/8 3/8-Inch Heavy-Duty Nut Driver

Klein Tools 635-3/8 3/8-Inch Heavy-Duty Nut Driver

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Model: 635-3/8
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$71.09
$18.10
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3/8-Inch Heavy-Duty Nut Driver

  • Features

    • Heavy duty shaft with classic Cushion-Grip™ handle
    • Wrench assist for additional torque
    • Wrench Assist For Greater Torque
    • Hollow shaft allows for nut driving on unlimited bolt length
    • Magnetic feature helps retain nut
    • Color coding for easy identification of different sizes

  • Warnings

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


635-3/8 - spec sheet

Manufacturer Resources

Product Specs

Color Code:
Blue
Insulated:
No
Magnetic:
Yes
Nut Driver Sizes:
3/8"
Overall Length:
9" (22.9 cm)
Shaft Length:
4" (10.2 cm)
Department:
Electrical
Product Group:
Hand Tools
Product Subgroup:
Screwdrivers & Drivers
Product Height:
1.3500 in
Product Material:
Steel
Product Weight:
0.3000 lbs
Product Width:
2.3400 in
Product Depth:
9.0000 in
Product Type:
Nut Driver

Klein Tools 635-3/8 – Frequently Asked Questions

1) Can the Klein 635-3/8 nut driver be used on live electrical work?
No. The 635-3/8 is not insulated and will not protect against electrical shock, so it is not for live work. Use a rated insulated driver for energized circuits. Klein also advises approved eye protection whenever you use it.
2) Will a 3/8-inch nut driver work on long threaded rod or a bolt that sticks out past the nut?
Yes. The 635-3/8 has a hollow shaft, so the bolt or rod passes up inside the shaft and bolt length is not a limit. The shaft measures 4 inches with a 9 inch overall length, so the working reach is the 4 inch shaft plus whatever the hollow bore swallows.
3) Does the Klein 635-3/8 hold the nut so I can start it one-handed overhead?
It does. The 3/8-inch socket is magnetic to retain the nut, which is what you want reaching into a panel or working overhead on strut and box hardware. Steel construction throughout.
4) What do I do when a nut is too tight to break loose by hand with a nut driver?
The 635-3/8 has a wrench assist on the shaft, so you can put an open-end wrench on it for extra torque instead of switching tools. That is the difference between this heavy-duty version and a plain nut driver, along with the heavy duty shaft behind the Cushion-Grip handle.
5) How do I tell the 3/8-inch Klein nut driver apart from the other sizes in my pouch?
By color. Klein color codes these drivers by size and the 3/8-inch 635-3/8 handle is blue, so you can pull the right size out of a pouch without reading the stamp.
6) Is the 635-3/8 short enough to carry in a tool pouch?
Yes, 9 inches overall and 0.3 lbs, so it rides in a pouch easily. If you need to reach a nut recessed deeper than the 4 inch shaft allows, look at a longer-shank driver instead.
7) What is the exact Klein part number for the 3/8-inch heavy-duty nut driver?
Klein Tools 635-3/8. That is the manufacturer part number, and the 3/8 in the suffix is the socket size, not a shaft dimension.
How fast can I get the Klein Tools 635-3/8 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 635-3/8 come with a warranty?
Absolutely. The Klein Tools 635-3/8 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 635-3/8?
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 635-3/8 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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