Description
Heavy-Duty 3/4" All-Brass Vehicular NMO Antenna Mount with 17' RG-58 Coax
Commercial-grade solid brass 3/4-inch hole mount with silver-plated contact pin and 17-foot un-terminated RG-58 cable for custom radio installs.
The Purchase Radios NMO-RG58-17-NC is a commercial-grade 3/4-inch permanent hole vehicular NMO antenna mount. Engineered for public safety vehicles, commercial fleet utility trucks, transit buses, heavy equipment, and municipal transport, this mount provides a solid RF ground connection for mobile two-way radio antennas. Sourced directly from our verified inventory of Two-Way Radio Antennas, this all-brass NMO mount ensures high signal transfer efficiency and long-term durability.
Machined from premium solid brass and paired with a high-conductivity silver-plated contact pin, the Purchase Radios NMO-RG58-17-NC resists corrosion and contact oxidation in compliance with ASTM Standards (ASTM B117). Built to endure relentless vehicle roof vibration, tree-branch strikes, and automated car-wash friction, the assembly meets automotive physical durability benchmarks under SAE Standards (SAE J1455) and extreme vibration testing under DoD Standards (MIL-STD-810H). A high-compression silicone O-ring gasket seals against vehicle roof panels to prevent water leaks and roof corrosion certified under IEC Standards (IEC 60529 IP66). Supplied with 17 feet of low-loss 50-ohm RG-58 coaxial cable with an un-terminated ("No Connector") lead, this kit allows technicians to easily route the cable through vehicle headliners, pillars, and firewalls without snagging before crimping the specific RF connector needed for the mobile radio.
Key Features & Benefits
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Solid Machined Brass Construction: Delivers superior mechanical durability and low-resistance RF ground bonding to the vehicle chassis compared to zinc or alloy mounts.
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Silver-Plated Contact Pin: Provides maximum electrical conductivity and oxidation resistance for low insertion loss across VHF, UHF, and 700/800/900 MHz bands.
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17-Foot RG-58 Coaxial Cable: Generous 17-foot cable length accommodates full vehicle runs from the roof or trunk to dashboard and console radio locations.
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Un-Terminated Lead (No Connector): Allows easy routing through narrow dashboard grommets, pillars, and firewall holes prior to installing your choice of connector.
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High-Compression Weather Seal: Includes an industrial O-ring gasket that seals tight against sheet metal to protect vehicle interiors from water leaks.
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Universal 3/4-Inch Hole Fitment: Installs into industry-standard 3/4-inch round drilled holes on vehicle roofs, trunk lids, or equipment bracket tabs.
Specifications
| Attribute |
Details |
| Brand |
Purchase Radios |
| Model / SKU |
NMO-RG58-17-NC |
| Product Type |
Vehicular Mobile Antenna NMO Hole Mount Assembly |
| Mounting Interface |
Standard NMO (Motorola Style 3/4" Threaded Interface) |
| Hole Size Requirement |
Standard 3/4 in (19 mm) Diameter Hole |
| Mount Body Material |
Solid Machined Brass |
| Center Contact Pin |
Silver-Plated Brass Pin |
| Coaxial Cable Type |
RG-58A/U 50-Ohm Coaxial Cable |
| Cable Length |
17 Feet (5.18 Meters) |
| Cable Termination |
Unconnectorized / No Connector (NC) |
| Environmental Ingress Rating |
IEC 60529 IP66 (Weather-Sealed with O-Ring Gasket) |
| Operating Frequency Range |
VHF, UHF, 700/800/900 MHz Commercial Bands |
| Finish / Color |
Natural Machined Brass Body with Black Coaxial Jacket |
What’s Included
| Description |
SKU / Model |
Status |
| Purchase Radios 3/4" All-Brass NMO Mount Assembly |
NMO-RG58-17-NC |
Included |
| Integrated 17-Foot 50-Ohm RG-58 Coaxial Cable Lead |
OEM Assembly |
Included |
| High-Compression Weather-Sealing O-Ring Gasket |
OEM Component |
Included |
| RF Radio Connector (Mini-UHF, BNC, TNC, PL-259) |
Job-Specific Hardware |
Sold Separately |
Recommended Accessories & Replacement Hardware
Mobile Control & Remote-Mount Hardware
Dispatch & Base Hardware
Vehicle Transceivers & Antennas
More Resources
Frequently Asked Questions
What does "No Connector" (NC) mean for this mount?
The "NC" designation indicates that the 17-foot RG-58 cable has a bare, un-terminated end without an attached RF plug. This allows installers to easily route the cable through small firewall grommets, door pillars, and dashboard access holes without drilling oversized holes. Once routed, the installer crimps or solders the exact connector needed for their specific radio.
What size hole must be drilled to install this mount?
This is a standard 3/4-inch permanent hole mount. It requires a clean 3/4-inch (19 mm) round hole drilled into the roof panel, trunk deck, or an external mounting bracket using a hole saw or chassis punch.
Why is solid brass preferred over zinc or aluminum for NMO mounts?
Solid brass provides superior electrical conductivity, optimal RF ground plane bonding to the vehicle body, and high mechanical tensile strength. Brass will not gall or strip during antenna installations and resists corrosion caused by moisture and road salts.
What antennas are compatible with this mount?
Any standard mobile antenna that features an NMO base (including VHF, UHF, 700/800/900 MHz, and multi-band mobile whips) threads directly onto this mount.
Does this mount seal against rainwater entering the vehicle cab?
Yes. The assembly includes a high-compression rubber O-ring gasket. When tightened down against the vehicle sheet metal, it forms a watertight seal that keeps moisture and dust from penetrating into the headliner.
Warranty
1-year manufacturer’s replacement warranty.
