MPN: JPJN-58B.750 / JPJN-58S.750


  • Re-usable
  • Easier to time your muzzle device


  • Material: Steel
  • Weight: 0.2 oz.
  • Finish: Black (Phosphate) or Raw Stainless Steel
  • Thread: 5/8"-24


  • Any barrel with 0.750" outer diameter with 5/8"-24 TPI (Threads Per Inch)


Every operator has his favorite setup. You finalize a build with the brake and accessories that make it fit you best. You probably know what you want in a brake, but if you’re going to mount it yourself, you’re in for a whole new set of decisions. Most brakes require timing to get their ports lined up appropriately in order to work as intended. The question is: How are you going to ensure your brake stays where it is supposed to? You could fight with crush washers, or even pin weld it, but the best option for most shooters is to use a 5/8-24 hex nut to keep your brake installed securely with minimum complication. The JP Enterprises 5/8-24 Jam Nut allows you to install your brake at the proper timing, correct errors and even remove it entirely in the future with no hassles.

Easily Install Your Brake, and Take It Off Too

Using a 5/8-24 nut to install a muzzle device makes it a simple matter to secure your muzzle device in the proper position. Thread your jam nut onto your barrel followed by your chosen muzzle device. Once your brake and 5/8-24 nut are tightened against one another the installation of your brake is complete. If it’s not quite right, you have the option to loosen them again and correct the installation. That’s not so easy with other timing devices. If you used a washer for installation, you’re going to have to start over with a new washer, and unless you keep them on hand, that means you’ll be waiting for the mail again.

Two Quality Finishes

The JP Enterprises 5/8-24 Jam Nut is a quality 5/8-24 hex nut manufactured specifically for the purpose of mounting muzzle devices. This quality firearm accessory is available in bare stainless steel or with a tough Magnesium Phosphate finish that will endure whatever your operating environment dishes out.

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Reviews (6)

  • 5/8-24 Jam Nut

    Posted by David Petix on 2nd Jan 2022

    I no longer us crush washers since I tried these, not only do they work well they look good, my only suggestion would be to add a couple of o-rings to fill the space between the nut and base of barrel threads once what you are using is clocked, it would also set your company’s from others selling Jam Nuts

  • jam nut

    Posted by Alan Talbott on 2nd Oct 2020

    Works great but a little pricey.

  • jam nut does what it should.

    Posted by john on 25th Dec 2019

    No issues works as it is supposed to. Bought two.

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