BNC Connectors: Overview, Uses, and Adapters
July 10,2025
1.What is a BNC connector?
BNC (Bayonet Neill-Concelman) connectors are twist-locking plugs widely used in video and radio equipment. Their unique bayonet mount makes them quick to connect/disconnect – just push and twist!
Main features of BNC connector
- Gold-plated contacts ensure clear signal transfer
- 75Ω/50Ω impedancematches different cables
- Industrial grade durability: supports 500 plug-in and pull-out cycles, withstands 1500V voltage, and is suitable for high temperature environments (-55℃~155℃)
2.What is a BNC cable?
It’s a coaxial cable with BNC plugs on both ends, It actually refers to the combination of coaxial cable + BNC connector.
The structure is divided into four layers:
- Central copper core: transmits signals (diameter 50Ω>75Ω).
- Insulation layer: milky white PE/PF material, isolating the core wire and the shielding layer.
- Metal shielding mesh: copper braided mesh, grounded and anti-interference.
- Outer rubber: physical protection.
3.What is a BNC plug vs port?
Plug - Male Connector
Physical features:
Center pin diameter: 50Ω=0.92mm, 75Ω=0.64mm
Shell material: nickel-plated brass (corrosion resistant)
Product examples:
Straight head: BNC-J-5 welding male head
Port - Jack/Female Connector
Installation method:
PCB welding type: Communication connector adapter (BNC-K)
Panel mounting type: hexagonal nut fixing (BNC-KKY through-wall female connector)
Key parameters:
Interface withstand voltage: AC 1500V/min
Contact resistance: ≤5mΩ
Compatibility warning: Forcibly inserting a 50Ω plug into a 75Ω port will cause the center pin to bend!
Professional advice: Impedance needs to be matched! Use a 50Ω male connector for the radio and a 75Ω male connector for the camera.
4.No-Tools Solutions: Save Your Time!
Hate crimping? Try our Tool-Free BNC Connectors:
Gold-Plated Solder-Free BNC/Q9 Connector for RG59/U (75-5) SDI Video Cable
In home theaters, conference rooms or monitoring systems, conversion between BNC and RCA interfaces is a common requirement – but traditional adapters often cause headaches due to complex installation, signal attenuation or loose interfaces.
Core product models and features
The core value of the BNC to RCA adapter lies in “no signal loss + easy installation”. The following are 3 series of models and features optimized for different scenarios:
- Solder-free spring lock (BNC-K-5 75-5 type)
Features:
Pure copper gold-plated inner core
The contacts are made of pure copper gold-plated inner core, with good surface treatment, anti-oxidation and easy welding to achieve high-fidelity signal transmission.
Alloy die-casting is exquisite and strong
The shell is made of pressed alloy with fine surface treatment, and has good anti-pressure, anti-fingerprint and anti-interference properties.
Advantages:
It solves the pain point of “cables easily loose” (such as the connection between surveillance cameras and DVR) and is outdoor/mobile device friendly.
Technical parameters:
| English Parameter | English Value |
|---|---|
| Name | American-style Pure Copper Video Connector |
| Type | Solder-free |
| Pin Core | Gold-plated Pure Copper |
| Wiring Clip | Gold-plated Pure Copper |
| Outer Layer | Nickel-plated Alloy |
| Frequency Range | 0-5GHz |
| Insulation Resistance | ≥5000MΩ |
| Contact Resistance | Inner Conductor ≤2.0mΩ, Outer Shell ≤0.2Ω |
| Dielectric Withstand Voltage | 1500V |
| Voltage Standing Wave Ratio (VSWR) | ≤1.3 |
| Connector Durability | 500 mating cycles (material and coating) |
| Model | RG59 Black Coaxial Cable 75-4 | ||
| Description | Radio frequency cables with Foam polyethylene dielectric | ||
| Structure Parameter | Inner Conductor | Bare copper | 1/0.59+0.02mm |
| Insulation Layer | PE | 3.70 + 0.10mm | |
| Wire braid | Bare copper | 128*0.12mm | |
| Jacket | PVC | 6.10+0.20 mm | |
| Making | |||
| Electrical data | impedance | 75±3Ω | |
| capacitance | 66±5 pF/m | ||
| Velocity ratio | 66% | ||
| Bent radius | 66mm | ||
| Max voltage | 2000VMS | ||
| Max Frequency | 2000MHz | ||
| Temperature scope | -20~+80℃ | ||
5.Quick Comparison Table (Beginner-Friendly!)
| Use Case | Product Recommendation | Why It's Easy |
|---|---|---|
| Monitor to TV Conversion | BNC Female to RCA Male Connector | Plug-and-play, no setup required |
| Extending BNC Cables | BNC-KKY Nut-Type Coupler | Rotational locking, prevents disconnection |
| Laboratory High-voltage Equipment | MHV3000V to BNC Male Adapter | Withstands 3000V voltage, safe and reliable |
| Control Box Neat Wiring | BNC Bulkhead Feedthrough Adapter | Large hexagonal nuts, stable installation |
FAQs (Answers in 1 Sentence!)
Q: What does BNC stand for?
A: Bayonet Neill-Concelman – Named after its inventors!
Q: Which BNC adapter for CCTV to DVD player?
A: 75Ω BNC female to RCA male adapter (model BNC-K/RCA-J) to ensure impedance matching.
Q: Can I connect BNC to regular TV port?
A: Use a BNC to HDMI converter (supports 4K) to directly connect to the TV HDMI port.
Q: Why gold plating?
A: Prevents corrosion (critical in humid areas).
Q: How to choose BNC double-pass and three-way?
A: For high-density cabinets, use flanged BNC-KKY, and for mobile devices, choose spring-locked BNC-K-5.
Q: Does BNC to RCA affect the image quality?
A: Use 75Ω gold-plated BNC female to RCA male (such as BNC-K/RCA-J) .
Q: Which connector for higher-bandwidth signals?
A: Triaxial BNC (such as TRB/BNC-JJ) supports 6GHz, which is better than ordinary coaxial.
Bonfon Office Building, Longgang District, Shenzhen City, Guangdong Province, China
A China-based OEM/ODM RF communications supplier
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