CB Antenna Stud Mount (PL-259)



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Quick Overview

This Firestik stud mount is our best-selling stud and the one we recommend for general CB applications! Instead of low-cost components, Firestik uses stainless steel, machined brass and oversized hex stock for a high-quality stud that will last. The SO-239 connection is compatible with all PL-259 style coax connections. For best performance, we recommend using with antennas 5' and shorter. If you'll be using a longer antenna, you'll want to consider a ball mount or an oversized, heavy-duty stud.

Firestik K4A CB Antenna Stud

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  • Firestik K4A CB Antenna Stud
  • PL-259 Antenna Stud - Side
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  • PL-259 All Included Parts
  • Firestik K4A Stud Diagram
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Additional Information

Model / SKU: Firestik K4A
Recommended for: All-purpose CB use for antennas 5' and shorter. For antennas longer than 5', use a heavy-duty stud or ball mount.
Compatible with: Accepts all fiberglass and center-load antennas with a 3/8" x 24 thread. SO-239 connection on the bottom is compatible with coax that has PL-259 barrel-style ends. Designed for 1/2" stud holes, which are the industry standard on all CB mounts.
Installation Notes: It's crucial to install the nylon washer between the metal mounting surface and the top antenna nut. If not, a short will occur. See stud washer troubleshooting for more information. If installing on a flat surface without a mount, a 1/2" hole should be drilled.
Mount Location: Other
Stud Type: PL-259 (Barrel)
Material Stainless Steel
Product Includes: Stud mount
Antenna, mount and coax not included


The importance of the stud mount cannot be overstated! The antenna stud mount acts as a bridge between the antenna and the coaxial feed line. Accordingly, it needs to allow for efficient transfer of your signals to and from the transceiver. If the stud mount doesn't perform that task efficiently, you end up with unneeded loss. And if that isn't enough, the stud mount must be strong enough to withstand the stress from an antenna subject to severe wind load and vibration.

Firestik stud mounts have become the industry standard. This wasn't by accident; it's because users learned to appreciate their outstanding design and quality material. Instead of inexpensive aluminum, Firestik uses chrome-plated machine brass. Instead of 9/16" (14mm) hex stock, they use 5/8" (16mm) stock. Instead of ABS or inferior plastic insulators, they use nylon. Instead of cadium-plated hardware, they use stainless steel. And their heavy-duty 3/8" center shanks can mean the difference between trouble-free use and lost antennas. Some businesses have copied the look of the Firestik antenna studs, but those "low-cost targeted" parts have a tendency to come apart -- it's buyer beware! You might save a dollar, but you could also lose a $25+ antenna as your "reward."

This K-4A stud mount has been praised by communications professionals for 20 years. You can actually pay more for a stud mount but you certainly will not get more than what the K-4A offers. The K-4A should be used whenever a PL-259 terminated coax cable is to be used (K-8A, K-9A, R-8A, R-9A). Like the K-4, this stud is designed for 1/2" (13mm) holes. In a typical installation, antennas with 0.680" (15mm) of exposed threads can be used without the fear of bottoming out before proper tightening is accomplished.

  • Industry-leading, quality construction antenna stud mount
  • Standard 3/8" x 24 thread
  • 5/8" (16mm) hex
  • Screw-on coax connection
  • One-year warranty 

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Customer Reviews


Review by Cummins Guy
Overall Rating
Works well. The only complaint I have is that if mounting it into a thicker material say, 1/4" back rack, there is not enough thread to fully engage into the other part. I had to do without the lock washer and check it a few times a week to make sure it has not backed out. (Posted on August 5, 2014)
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(1 of 1 people found this review helpful)

Good Product!

Review by Dan Star
Overall Rating
Stud mount works great with Terraflex spare tire mount and 4ft Firestick on my 2010 Wrangler JK. (Posted on May 5, 2014)
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Hard to find, item found!

Review by Swifty
Overall Rating
My father was desperately seeking for this part. After numerous searches online, we came across this site. It has great prices and carries "hard to find" items plus fast shipping! We will definitely buy again and will spread the word! (Posted on April 3, 2013)
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(2 of 3 people found this review helpful)

Great product!

Review by Matt L
Overall Rating
This stud mount is used with the bandi mount for my '07 FJ Cruiser along with a medium spring and quick disconnect which are hooked up to a 3' Firefly antenna. I have had no problems with reception or transmitting. In the end I really like this stud and would definitely recommend it. (Posted on February 7, 2013)
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(0 of 1 people found this review helpful)