RG-213U (400-series) Coax Assemblies - Pick your Connectors (Priced by length)

Our reliable workhorse! RG-213/U is a proven, rugged 50-ohm coaxial cable built for high-power RF applications where durability, shielding, and straightforward performance matter most.

Available by the foot or in full spools, this MIL-Spec-grade bulk cable features a 13 AWG stranded bare copper center conductor and a tough, non-contaminating black PVC jacket, delivering the strength and reliability that hams, commercial users, and professionals have trusted for decades.

With a solid polyethylene dielectric and 96-97% tinned or bare copper braid shielding (often with excellent coverage), RG-213/U provides solid RF integrity and effective suppression of interference. Its nominal outer diameter of 0.405", minimum bend radius of about 4-5", and weight of roughly 0.16 lbs/ft strike a great balance between robustness and usability—ideal for fixed installations, antenna runs, and setups that don’t require extreme flexibility.

RG-213/U stands up well to outdoor exposure thanks to its UV-resistant jacket, making it suitable for base station feeds, tower runs, and general ham radio use. It handles high power effectively (often rated for several kW at HF frequencies) and offers consistent 50-ohm performance with a velocity factor around 66% and capacitance of approximately 30-31 pF/ft.

Attenuation examples (typical):
- ~0.6 dB/100 ft at 10 MHz
- ~1.5 dB/100 ft at 50 MHz
- ~2.1 dB/100 ft at 100 MHz
- ~3.0 dB/100 ft at 200 MHz
- Higher at UHF, making it best suited for HF through lower VHF applications or shorter UHF runs.

Compared to lighter RG-8X types, RG-213/U offers significantly better power handling, lower loss at most frequencies, and greater durability. While modern low-loss options like LMR-400 or Bury-Flex provide less attenuation for long runs or higher frequencies, RG-213/U remains a cost-effective, no-nonsense choice that excels in high-power HF setups, mobile installations, and environments demanding mechanical toughness and proven reliability—without the need for premium pricing. It works seamlessly with standard PL-259, N-type, and other common RF connectors.

Typical applications include ham radio antenna feeders (especially HF), base and mobile stations, marine and commercial communications, SCADA systems, and any RF interconnect where rugged construction, solid shielding, and high-power capability are priorities.

RG-213/U is the classic American-made (or MIL-Spec equivalent) standard that delivers dependable performance year after year— a true workhorse for amateur radio, broadcast, and professional RF systems that simply gets the job done right.