BNC Connectors

BNC Connectors – Bayonet RF Coaxial Connectors for Video, Broadcast, and RF Applications

The BNC connector is a miniature quick-connect/disconnect radio-frequency connector for coaxial cable. Introduced on military radio equipment in the 1940s, it has since become widely used in radio systems and as a common type of video connector. Today, it remains one of the most trusted RF interfaces across broadcast, surveillance, test and measurement, telecommunications, and industrial electronics.

At HUADA , we manufacture a complete range of BNC RF coaxial connectors developed to MIL-C-39012/16-24 military specifications, covering 50 ohm and 75 ohm configurations, straight and right angle styles, cable mount, bulkhead, panel mount, PCB mount, flange mount, and waterproof sealed variants. Whether you need a standard crimp plug for field cable assembly or a precision flange jack for a broadcast enclosure, our BNC series delivers the mechanical reliability and signal integrity your application demands.

BNC Connector Specifications 

Interface Mating Dimensions

Our BNC Connector Series

Our BNC product range spans every major connector style found in professional RF and video installations. The following series correspond directly to the product types in our catalog.

BNC Male Plug — Cable Mount (BNC-J Series)

The BNC-J series covers straight cable plug configurations for the most common RF cable types used in field and production environments. Our catalog includes:

• BNC-J3 / J4 / J5 — Straight crimp plugs for SFF-50, SYV-50, and SYV-75 series cables, with body diameters from ø3.1 mm to ø5.2 mm and overall length of 31.1 mm
• BNC-J12 / J13 — Larger body crimp plugs for SYV-75-3 and SYV-75-5 cables, ø6.2 mm and ø7.4 mm, 35 mm length
• BNC-J21 — Clamp-style straight plug for SDY-4 cable
• BNC-J8 — Heavy-duty straight plug for SYV-50-7-2, with 44 mm length and ø19 mm body

Crimp connectors use a separate ferrule that gets crimped over the cable braid and connector body using a dedicated coaxial crimping tool. A correctly crimped connection is mechanically permanent, with pull-out strength above 40 lb, and its contact resistance holds under sustained mechanical stress.

BNC Male Plug — Right Angle Cable Mount (BNC-JW Series)

Right angle BNC plugs change the cable exit direction by 90 degrees, thereby reducing strain and improving routing in compact enclosures and tight panel installations.

• BNC-JW3 / JW4 / JW5 — Right angle crimp plugs for SFF-50 and SYV-50 cables, body diameters ø3.1 to ø5.2 mm
• BNC-JW12 — Right angle plug for SYV-75-3, ø5.2 mm, 35 mm length
• BNC-JW3Y / JW4Y / JW5Y — Right angle crimp plugs with clamp-style termination for SFF-50-1.5-1, SFF-50-2-2, SYV-50-2-1, and SYV-50-3 cables

BNC Male Plug — Crimp with Clamp (BNC-J2Y / J3Y / J4Y / J5Y Series)

The clamp series suits production environments where consistent, tool-driven termination is required for thin-body cables:

• BNC-J2Y / J3Y — For SFF-50-1 and SYV-50-1 cables, 33 mm length
• BNC-J4Y / J5Y — For SFF-50-2-2 and SYV-50-3 cables, 26 mm length
• BNC-75J3YA — 75 ohm clamp plug for SFYZ-75-2-1 cable, 32.2 mm length

BNC Male Plug — Large Cable / Heavy Duty (BNC-J12Y, J5Y-3, JB3)

For larger diameter cables used in high-power and broadcast applications:

• BNC-J12Y — For SYV-75-3, with 35.8 mm length and 12 mm clamp
• BNC-J5Y-3 — Crimp plug for SYV-50-3 cable, 28.6 mm length
• BNC-JB3 — For SFT-50-3-1, 21 mm compact body

BNC Male Plug — Flange Mount (BNC-50JF, BNC-50JY, BNC-50JJ)

Flange-mount and panel-feed-through male plugs serve instrument front panel and chassis integration:

• BNC-50JY — Panel feed-through male plug, 33.5 mm length, 3/8-32UNEF-2A thread, recommended panel cutout ø9.6 mm × 9 mm
• BNC-50JJ — Male-to-male inline coupler, 33.3 mm, ø14.5 mm body, for signal extension between two male cable plugs
• BNC-50JF — Flange-mounted male plug, 31.7 mm length, 17.5×17.5 mm flange, with 4×ø2.8 mm mounting holes

BNC Female Jack — Bulkhead Mount (BNC-KY Series)

The BNC-KY series provides threaded panel feed-through female jacks for chassis and enclosure mounting, serving as the primary fixed connection point in RF instruments, broadcast routers, and CCTV distribution equipment.

• BNC-KY13 — M14×1 thread, 32.4 mm length, panel cutout ø14.2 mm × 12.6 mm
• BNC-50KY — 3/8-32UNEF-2A thread, 23.5 mm length, cutout ø9.6 mm × 9.1 mm
• BNC-50KY-3 — Shorter body, 21.5 mm, cutout ø9.6 mm
• BNC-50KY-4 / KY-5 / KY-6 — Variants with different rear contact styles and panel mounting geometries
• BNC-75KY — 75 ohm version, 23.5 mm, cutout ø9.6 mm × 9.1 mm
• BNC-KY12 — M14×1 thread with larger ø16 mm body, 31.9 mm length
• BNC-KY3A — Clean low-profile bulkhead jack, 27.8 mm, cutout ø12.8 mm × 11.9 mm
• BNC-KY21 — M14×1 heavy-duty bulkhead, 36.2 mm, for SDY-4 cable

Bulkhead connectors mount through a chassis panel using a hex nut or flange, providing an external-facing interface for internal cabling. They are therefore the go-to choice for instrument front panels, rack equipment rear panels, and enclosure RF ports. In addition, they are available in both 50Ω and 75Ω versions, as well as isolated and chassis-grounded configurations, depending on whether the shield needs to be isolated from the panel ground.

BNC Female Jack — Cable Mount with Clamp (BNC-KY2 / KY3 / KY4 / KY5 and Y Series)

Female cable jacks for direct cable termination, compatible with a range of SFF-50 and SYV cable families:

• BNC-KY2 — 1/2-28UNEF-2A thread, 28 mm length, for SFF-50-1 and SYV-50-1, cutout ø12.8 mm × 11.9 mm
• BNC-KY3 — 3/8-32UNEF-2A thread, 24.5 mm, for SFF-50-1.5-1 and SYV-50-2-1, cutout ø9.6 mm × 9.1 mm
• BNC-KY4 / KY5 — For SFF-50-2-2 and SYV-50-3, S16 thread
• BNC-KY2Y / KY3Y — Crimp variants for SFF-50-1 and SYV-50-1, 30 mm length
• BNC-KY4Y / KY5Y — Crimp variants for SFF-50-2-2 and SYV-50-3, 35.5 mm length

BNC Female Jack — PCB Mount (BNC-KHD, BNC-KA, and PCB Series)

PCB-mount BNC jacks connect RF signals directly to printed circuit boards in instruments, RF modules, and test fixtures.

• BNC-J4A / J5A — Solder-termination PCB mount male plugs, ø4.5 mm and ø5.5 mm center pin
• BNC-KYA / KYA-2 — Bulkhead jacks with PCB solder tail, 28.8 mm length, 3/8-32UNEF-2A thread, cutout ø9.75 mm and ø11.3 mm
• BNC-50KYA-1 / KYA-1 — Panel-mount PCB solder variants with 50Ω and 75Ω options
• BNC-KHD1 — SMD/through-hole right angle PCB jack, 17.6 mm length, 12×12 mm footprint
• BNC-50KHD2 / 75KHD2 — Surface mount PCB jacks, 21.5 mm length, 6.4×6.4 mm footprint
• BNC-KHD3 — Compact SMD PCB jack, 24 mm × 21 mm, for tight-pitch board layouts
• BNC-KWHD — Right angle through-hole PCB jack, 24.2 mm × 22.4 mm

PCB-mount BNC connectors solder directly onto a printed circuit board, providing an RF interface at the board edge or panel. As a result, contact resistance on a well-soldered PCB-mount BNC runs below 10 mΩ.

BNC Female Jack — Flange Mount (BNC-KF Series)

Flange-mounted jacks provide four-point mechanical fixing to panel surfaces, enclosures, and rack faceplates, giving the highest mechanical stability for connectors subject to repeated mating cycles.

• BNC-JFD / BNC-KF3 — 4-hole flange jack, 17.5×17.5 mm flange, 4×ø2.8 mm mounting holes, for SFF-50-1.5-1 and SYV-50-2-1 cables
• BNC-KF4 — Flange cable jack for SFF-50-2-2, SYV-50-2-2 (ø4.2 mm), SYV-75-3 (ø6.2 mm), and SYV-75-5-2 (ø7.6 mm) cables
• BNC-KF21 — Flange cable jack for SDY-4, 36.2 mm length, 17.5×17.5 mm flange
• BNC-50KFD / BNC-KFD2 — Straight post and right angle flange PCB mount jacks
• BNC-50KF / BNC-50KF-2 — PCB flange mount jacks, 17.5×17.5 mm and 17.5×12.7 mm flanges
• BNC-KYHD — Horizontal PCB flange jack, 1/2-28UNEF-2A thread, 14.1×14.1 mm footprint
• BNC-KWFD1 — PCB flange jack, 20×20 mm footprint, 4×ø2.8 mm mounting holes
• BNC-50KYF — Large-flange mount jack, 50/8-24UNEF-2A thread, 40 mm flange diameter, 4×ø3.5 mm mounting holes

BNC Female Jack — Adapter and In-Series (BNC-KK Series)

In-series adapters connect two BNC interfaces together for system reconfiguration, test bench patch panels, and cable extension:

• BNC-50KK — Female-to-female inline adapter, 33 mm length, 12 mm on each side, ø11 mm body
• BNC-50KKF — Female-to-female flange adapter, 17.5×17.5 mm flange, 4×ø2.8 mm mounting holes
• BNC-50KKY / BNC-75KKY — Bulkhead female-to-female adapters, 1/2-28UNEF-2A thread, 34.1 mm length
• BNC-50KKY1 / BNC-75KKY1 — M12×0.75 thread versions, 37 mm length
• BNC-75KK2 — 75 ohm female-to-female inline adapter, 32.4 mm
• BNC-75KKF — 75 ohm flange adapter, 17.5×17.5 mm flange, 33 mm length
• BNC-50KJK — T-connector for signal splitting, 26.2 mm × 32.56 mm, for joining three BNC interfaces

Waterproof Sealed BNC Connectors — BNC(S) and BNC(M) Series

For outdoor installations, industrial enclosures, and applications where moisture ingress is a concern, our sealed BNC series provides an IP-rated interface with O-ring sealing.

• BNC(S)-KY — Sealed bulkhead female jack with O-ring, 3/8-32UNEF-2A thread, 26.3 mm length, cutout ø10.3 mm × 8.3 mm
• BNC(S)-KY2-1 / KY2-2 / KY2A — 1/2-28UNEF-2A thread sealed bulkhead jacks, 28.2 mm length, cutout ø12.8 mm × 12 mm
• BNC(S)-KY3 — Sealed cable bulkhead jack for SFF-50-1.5-1 and SYV-50-2-1 cables, 27 mm length, 3/8-32UNEF thread
• BNC(S)-KY4 — 1/2-28UNEF-2A sealed bulkhead jack, 30 mm length, cutout ø12.8 mm × 11.9 mm
• BNC(S)-KF3 — Sealed flange-mount female jack, 17.5×17.5 mm flange, 30 mm length
• BNC(S)-50KKF / 50KKY — Sealed in-series female-to-female adapters, ø11.3–13 mm body
• BNC(M)-KY / KY-1 / KY-2 — Sealed male-contact jack variants with O-ring, 3/8-32UNEF-2A and 1/2-28UNEF-2A threads
• BNC(M)-KF — Sealed flange-mount male-contact jack, 17.5×17.5 mm flange, 4×ø2.8 mm mounting holes
• BNC(M)-KY2 — Large-body sealed male-contact jack, ø21 mm, 44 mm length, cutout ø12.8 mm × 12 mm

Cable Compatibility

Our BNC connectors support all major coaxial cable families used in RF, broadcast, and surveillance installations.

50 Ohm Cables: SFF-50-1, SFF-50-1.5-1, SFF-50-2-2, SYV-50-1, SYV-50-2-1, SYV-50-2-2, SYV-50-3, SFT-50-3-1, SYV-50-7-2, SDY-4

75 Ohm Cables: SYV-75-3, SYV-75-5-1, SYV-75-5-2, SFYZ-75-2-1, RG-59, RG-6

Matching the correct connector body diameter, center contact geometry, and ferrule size to your cable is essential for achieving a secure mechanical crimp and, consequently, maintaining controlled impedance throughout the assembly.

Applications of BNC Connectors

BNC connectors serve a wide range of industries: telecommunications for RF signal transmission and network infrastructure; broadcast and video using 75Ω connectors for HDTV, SDI, and CCTV systems; test and measurement in oscilloscopes, spectrum analyzers, and generators; military and aerospace for reliable interconnects in mission-critical RF systems; and security and surveillance in CCTV cameras, DVRs, and monitoring networks.

Broadcast and Professional Video

75Ω BNC connectors are engineered for video and broadcast applications. Their reduced dielectric thickness increases bandwidth and reduces signal distortion, making them ideal for SD and HD video, CCTV systems, and professional media production environments. In particular, our BNC-75KY, BNC-75KKY, BNC-75KFD, BNC-75KKF, and sealed BNC(S) series all serve this segment.

CCTV and Security Surveillance

Analog CCTV systems use 75Ω BNC connectors to transmit composite video on coaxial cable. Because the bayonet interface resists accidental disconnection during maintenance or vibration, it guarantees continuous video monitoring in security-critical installations. Moreover, our bulkhead and flange jack series suit both indoor panel installations and outdoor weatherproof enclosures.

Test and Measurement Equipment

Oscilloscopes, signal generators, and analyzers widely use BNC for reliable electrical performance. The quick-connect design is ideal where many coaxial cables must be swapped frequently. For this reason, our 50 ohm BNC-KY, BNC-KYA, BNC-KHD, and PCB-mount series all support lab and production test instrument designs.

RF Communications and Antenna Systems

50 ohm BNC connectors are best suited to applications where power handling and RF transmission are important. Common uses include antennas, radios, wireless networking, GPS systems, and high-power RF applications using cables such as RG-58, RG-174, and RG-213.

Industrial Electronics and Automation

In industrial monitoring, signal conditioning, and control systems, the bayonet lock resists accidental disconnection under vibration. Furthermore, our sealed BNC(S) and BNC(M) series add O-ring protection for outdoor enclosures and harsh industrial environments.

Military and Aerospace

The interface specifications for the BNC and many other connectors are referenced in MIL-STD-348. As a result, our entire BNC series — manufactured to MIL-C-39012/16-24 and Q/MB409-87 — is well suited to defense communication equipment and aerospace instrument assemblies.

Medical Equipment

In diagnostic and measurement instruments, BNC connectors provide a reliable, low-noise coaxial interface for signal acquisition chains, physiological monitoring leads, and RF imaging front-ends.

How to Select the Right BNC Connector

1. Choose impedance first
Start with 50Ω for RF, test equipment, and communications, or 75Ω for video, broadcast, CCTV, and SDI applications. Never mix impedances in the same signal chain.

2. Match the cable
Next, confirm the cable type, outer diameter, and center conductor dimensions before selecting a connector. Our catalog covers SFF-50, SYV-50, SYV-75, SFT-50, SFYZ-75, and SDY-4 cable families with correctly sized center contacts, ferrules, and body geometries.

3. Select the mounting style
After that, choose cable-mount plugs and jacks for field assembly, bulkhead types for panel and chassis feed-throughs, flange types for maximum mechanical stability, and PCB-mount types for board-level integration.

4. Choose the termination method
Crimp termination suits production environments with tooling control and repeatable pull strength. In contrast, solder or clamp termination suits repair, low-volume builds, and applications where specialized crimp tooling is unavailable.

5. Consider environmental requirements
For indoor laboratory and studio use, standard nickel-plated brass bodies perform well. However, for outdoor installations, marine environments, or industrial enclosures exposed to moisture and dust, select our BNC(S) or BNC(M) sealed series with O-ring protection.

6. Confirm gender and orientation
Finally, confirm that the gender and orientation match your layout. BNC male plugs carry the center pin and locking ring, while BNC female jacks carry the recessed socket and locking slots. Right angle versions reduce cable routing depth; straight versions suit standard panel and cable exit conditions.

Why Choose Our BNC Connectors?

Manufactured to Military Standards
Our BNC connectors are developed to MIL-C-39012/16-24 and comply with Q/MB409-87, ensuring dimensional interchangeability with international equivalents and suitability for demanding defense and industrial environments.

Complete Series Coverage
From the smallest PCB-mount SMD jack to heavy-duty M14×1 bulkhead plugs and large-flange 40 mm panel mounts, our catalog covers the full dimensional range engineers encounter across broadcast, RF lab, CCTV, and industrial automation projects. In other words, a single supplier covers every mounting style in your BOM.

Both 50Ω and 75Ω Available
We supply true 75 ohm broadcast-grade connectors alongside standard 50 ohm RF versions. Each series offers the correct center contact diameter and dielectric geometry for its impedance class, ensuring genuine impedance control rather than cosmetic labeling.

Sealed Variants for Harsh Environments
Our BNC(S) and BNC(M) series provide O-ring sealed interfaces for outdoor, industrial, and ruggedized applications. Additionally, they are available in multiple thread sizes and body styles to fit virtually any enclosure design.

Broad Cable Compatibility
With connectors matched to SFF, SYV, SFT, SFYZ, and SDY cable families across 50Ω and 75Ω, we help engineers select the correct part for their exact cable specification rather than accepting a generic approximation.

OEM and Custom Support
We support OEM customers with custom cable assemblies, alternative plating options, modified body dimensions, and bulk supply programs. In addition, our engineering team assists with connector selection, application-specific recommendations, and production documentation.

FAQ

1.What does BNC stand for?

BNC stands for Bayonet Neill–Concelman, named after inventors Paul Neill and Carl Concelman, who developed the design in the 1940s for US military use.

2. What is the frequency range of a BNC connector?

Standard 50Ω BNC operates from DC to about 4 GHz, while true 75Ω “12G” BNC video versions support SDI video up to 12 GHz.

3. What is the difference between 50 ohm and 75 ohm BNC connectors?

50 ohm BNC connectors are designed for RF transmission and higher power handling, while 75 ohm BNC connectors are optimized for low signal loss and minimal distortion. As a result, 75 ohm versions are ideal for video, broadcast, and receiver-based applications.

4. Can I connect a 50 ohm BNC to a 75 ohm connector?

Physically, yes — but electrically, it is not recommended. Mixing 50 ohm connectors with 75 ohm cables creates an impedance mismatch, which can cause signal reflections, standing waves, and degraded performance, especially at higher frequencies or longer cable lengths.

5. What is the difference between a BNC male and BNC female connector?

A BNC male connector (plug) carries the center pin and bayonet locking ring, while a BNC female connector (jack) carries the recessed socket and locking slots. Male plugs are typically used on cable assemblies; female jacks are typically mounted on panels, chassis, and equipment.

6. What termination methods are available?

Our BNC connectors are available in crimp, solder/clamp, and PCB-solder termination styles. Crimp suits production environments, while solder and clamp suit repair, specialty builds, and applications requiring a permanent bond.

7. What is a BNC T-connector used for?

Our BNC-50KJK T-connector allows one signal path to split into two, and is therefore commonly used in test setups, legacy video distribution systems, and RF signal monitoring applications.

8. Are waterproof BNC connectors available?

Yes. Our BNC(S) and BNC(M) sealed series incorporate O-ring sealing for outdoor, industrial, and ruggedized installations requiring moisture protection.

9. What cables are compatible with your BNC connectors?

Our connectors cover SFF-50-1 through SFF-50-2-2, SYV-50-1 through SYV-50-7-2, SYV-75-3 through SYV-75-5-2, SFT-50-3-1, SFYZ-75-2-1, and SDY-4 cable families. Each connector type specifies its compatible cable in the product datasheet.

10. Do your BNC connectors comply with military specifications?

Yes. Our entire BNC series is developed to MIL-C-39012/16-24 and complies with Q/MB409-87, ensuring full dimensional interchangeability with international same-series products.

Find the Right BNC Connector

From crimp cable plugs and bulkhead panel jacks to PCB-mount SMD jacks, flange-mount heavy-duty connectors, in-series adapters, T-connectors, and sealed outdoor variants, HUADA GROUP supplies a complete BNC RF coaxial connector range for broadcast, video, RF test, surveillance, industrial, and defense applications.

Contact our engineering team with your cable type, impedance, mounting style, and frequency requirements, and we will help you identify the correct connector quickly and accurately.