Product Description
SO-239 to 3/8"-24 Threaded Stud Antenna Mount Adapter
The American Radio Supply - ARS-SM1 is a heavy-duty antenna mounting adapter designed to connect a standard PL-259 (UHF Male) coaxial cable assembly to an antenna or mounting component with a 3/8"-24 threaded base. This adapter provides a convenient mechanical and RF connection for mobile, CB, amateur radio, and custom antenna installations.
The ARS-SM1 features a UHF-Female (SO-239) connector on one end and a 3/8"-24 threaded stud on the opposite end. The 3/8"-24 stud is a solid brass-alloy threaded section with no internal connector features. A white nylon reducing washer is incorporated into the assembly to accommodate mounting through a standard vehicle or equipment mounting hole.
Key Features
- UHF-Female (SO-239) to 3/8"-24 threaded stud
- Designed for connection to standard PL-259/UHF-Male coaxial cables
- 3/8"-24 threaded stud for compatible antenna bases and mounting hardware
- Solid machined brass-alloy threaded construction
- Nickel-plated finish for durability and corrosion resistance
- White nylon reducing washer included
- Delrin (acetal) dielectric insulator
- Machined brass-alloy center contact
- Gold-plated center contact for reliable electrical conductivity
- 9/16" wrench flats for installation
- Designed to accommodate a standard 1/2" mounting hole
- Compact 1.50" overall length
Specifications
| Part Number | ARS-SM1 |
| Connector 1 | UHF-Female (SO-239) |
| Connector 2 | 3/8"-24 Threaded Stud |
| Impedance | ~50 Ω |
| Frequency Range | DC to 300 MHz |
| Body Material | Brass Alloy |
| Finish | Nickel Plated |
| Center Contact | Machined Brass Alloy, Gold Plated |
| Insulator | Delrin (Acetal) |
| Reducing Washer | White Nylon |
| Overall Length | 1.50" (38.10 mm) |
| SO-239 Thread Length | 0.50" (12.70 mm) |
| SO-239 Diameter | 5/8" (0.625") (15.88 mm) |
| Body/Wrench Flat Size | 9/16" (0.5625") (14.28 mm) |
| Thread Size | 3/8"-24 |
| Mounting Hole Size | 1/2" (13 mm) |
Applications
The ARS-SM1 is suitable for a wide range of RF and antenna mounting applications, including:
- CB radio antenna installations
- Amateur/Ham radio antenna systems
- Mobile radio installations
- Vehicle antenna mounts
- Mirror and bracket-mounted antennas
- Bumper and fender mounting applications
- Fiberglass and whip antennas using a 3/8"-24 base
- Custom antenna fabrication and repair
- RF coaxial cable-to-antenna mounting connections
Installation
The 3/8"-24 threaded stud is designed to mate with antennas or mounting components having a corresponding 3/8"-24 female thread. The SO-239 female connector accepts a standard PL-259/UHF-male coaxial connector. The included white nylon reducing washer helps position and electrically isolate the adapter when installed through a mounting bracket or chassis hole.
Product Summary
ARS-SM1 – SO-239 to 3/8"-24 Threaded Stud Antenna Mount Adapter is a compact, rugged RF adapter for connecting UHF coaxial cable assemblies to antennas and mounting hardware using the common 3/8"-24 thread. Its machined brass-alloy construction, nickel-plated finish, Delrin insulation, gold-plated center contact, and included nylon reducing washer make it well suited for mobile, CB, amateur radio, and custom antenna applications.
Other Details
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Custom Field
Product Reviews
5 Reviews Hide Reviews Show Reviews
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Excellent
Excellent! I used it during my portable HF operations in Europe. Ham Radio Odyssey on Facebook and YouTube
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Works Perfectly
Worked perfectly and is now in use on my vehicle.
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Very Happy
Nice job. Very happy. Package score 10.
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An Essential Part
I had a terrible time finding someone carrying these adapters. I needed them to make a solid element 2m/70cm j-pole. I keep getting asked to make those antennas because they are tough and reliable. These adapters are an essential part. Thanks American Radio Supply.
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Works Great!
This connector is perfect for building an aluminum rod J Pole antenna. Without this you will not have a durable antenna that you can make solid connection to the feed coax, and you will be able to seal this better than with simply soldering the conductors together. Mine works great, and I use it with a cargo rack mount to use as a field expedient mobile com unit with a 5 watt HT - it is amazing how well this works. Great for setting up as a field post for events, and it stows easily for transport or storage.
