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KLEIN TOOLS

Klein Tools 56999 Conduit Locknut Wrench for 1/2-Inch and 3/4-Inch Connectors, Direct Drive Heads Rotate

  • Based on 694 reviews
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Availability: In Stock.
Fulfilled by Amazon
Arrives Tuesday, Jul 14
Order within 34 minutes
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Features

  • Unique design loosens or tightens connectors using a stationary twisting motion
  • Easily attach locknuts in tight or deep cut-in boxes
  • For 1/2-Inch and 3/4-Inch connectors
  • Direct-drive heads rotate each other when twisted
  • Heavy duty steel construction enables needed torque to loosen or tighten connectors
  • Perfect for remodel work where box is filled with existing wires

Description

Perfect for hard to reach connectors. Works in deep or tight boxes where pliers or fingers can't. Drive shaft design lets you easily loosen and tighten conduit connectors using a stationary twisting motion. Turn a complicated operation into an easy two hand task with Klein's conduit locknut wrench. For more than 160 years, Klein Tools has manufactured premium-quality, professional-grade hand tools that deliver the performance, durability and precision needed to get the job done right. Our family of engineers, workers and craftsman continue to put six generations of expertise into every tool we create by using only the highest quality materials, superior workmanship, and keeping manufacturing as close to home as we can. Klein isn't just the name of our company, it's also our family name. And since we're an American company that's family-owned and family-run, you know you can count on us to be here tomorrow. Klein Tools doesn't just make great products, we make great products that stand up to the demands of the professionals who use them every day ... Since 1857.

Color: Black


Brand: KLEIN TOOLS


Material: Alloy Steel


Item Length: 9 Inches


Item Weight: 0.89 Pounds


Head Style: Box End


Operation Mode: Mechanical


Is Racheting: Yes


Is Non Sparking: No


End Style: hang hole


Measurement Standard: SAE (Inch)


Wrench Length Style: standard


Material Type: Alloy Steel


Finish Types: Brushed


Color: Black


Item Length: 9 Inches


Item Weight: 0.89 Pounds


Package Quantity: 1


Jaw Capacity: 0.75 Inches


Brand Name: KLEIN TOOLS


Model Number: 56999


Manufacturer: Klein - Geneva Supply


UPC: 092644569999 785971838561


Global Trade Identification Number: 99


Manufacturer Part Number: 56999


Item Type Name: Klein Tools Conduit Locknut Wrench, Fits 1/2", 3/4"


Unit Count: 1.0 Count


Manufacturer Warranty Description: 1 Year Manufacturer


Included Components: Conduit Locknut Wrench, 1/2" and 3/4"


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Tuesday, Jul 14

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

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Top Amazon Reviews

    • Super handy, excellent tool!
Excellent for those who work with flex and boxes. I have used this several times since purchase, and I am impressed. I have always hated having to put lock nuts on flex connectors inside of j-boxes, because often there isnt much room to get yoir hand in there to tighten or loosen. This tool gets in to most areas for you. This thing holds the nut well, and gets the tight with little effort. It will loosed the nuts that have been overtightned, and save your flathead from the abuse of hammering. The proce seemed a little steep, but honestly after using this I feel it is worth it. It is larger than I thought it would be, but it is solid, and the internal parts need the support of a solid housing. This was well worth the investment in my opinion, and the little steel wrenches I was using are obsolete now. So far, I would recommend this to anyone that finds their hands getting cut or scraped up while trying to fidget with putting nuts on. Also, when hammering on a box that has been fastened on a sheetrock wall will often loosen the box, you do not want that to happen because you were trying to loosen a nut. The leverage this tool provides is substantial, and I'm glad this was created. ... show more
Reviewed in the United States on August 11, 2025 by Brian
    • Good tool
After 30 years in the trade my stiff hands are getting inside the smaller device boxes as easily. Gave this tool a try,although I don't use it alot,it works perfectly in the tight areas. Money well spent.
Reviewed in the United States on April 4, 2024 by Keith
    • Helpful, but not perfect
Its pretty good. Works well with gem boxes. However, the 3/4" socket needs to be filed in order to fit the lock nuts
Reviewed in the United States on March 11, 2026 by Kevin Robinson
    • It actually works..
So I'm convinced the people who say it doesn't work aren't sure what they've bought. If you're an electrician who deals with steel cut-in boxes and MC; you know what a pain it is to spin a locknut on inside a single gang box with two fingers. Fight the connector while pulling wires to make the threads straight, etc. If you want a solution, this is it. I used it 4 times on a commercial job today and it worked every time. That's the reason I got one. Starting MC locknuts on steel cut-in boxes. People say it's made for tightening or breaking locknuts loose, no. Its best function is a locknut STARTER for hard to reach locations. I could care less about it being able to break anything loose. That's why they make lineman's.... to hit the back of the screwdriver with! Bottom line: It works. One improvement I'd make is to magnetize the bezel that holds the locknut. That way you could move it around and it wouldn't come off until threads were started. ... show more
Reviewed in the United States on January 4, 2024 by Matthew
    • Great
great in a pinch, just dont put too much torque on it
Reviewed in the United States on July 26, 2025 by Ethan Baird
    • Don't buy. Doesnt work as advertised
This doesn't fit all lock nuts Would not buy. Only fist cast style nut wont fit the stamped steel style nuts
Reviewed in the United States on April 23, 2026 by Brad N.
    • Great
Great
Reviewed in the United States on March 2, 2026 by The product was as described. Very well made and works great.
    • Not great
Works fine if the lock ring is in the top, bottom or side of the box. If the lock ring is in the back of the box it won't reach it.
Reviewed in the United States on February 9, 2026 by James Harmston

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