Common SM connector

GMB Series Circular Electrical Connectors

      The Standard SM Product is a watertight electrical connector specially designed for underwater depths of 0 to 450 meters (in fresh or seawater). Its core features include long-term reliable sealing. The socket contacts utilize a wire basket (hyperboloid) structure to ensure stable contact. The plug and socket are securely locked via a threaded coupling mechanism, and terminations are solder type. This series includes five models: 30, 39, 52, 56, and 72, offering various contact arrangements. Its technical performance complies with the CB1177-87 standard. It is mainly used for electrical connections between sonar transducers, watertight junction boxes, and underwater equipment and cables.

Product Descriptions from the Supplier

   The Standard SM Product offers long-term sealing and reliable connections at underwater depths of 0 to 450 meters. It features a wire basket (hyperboloid) structure and threaded coupling, providing excellent vibration and shock resistance. With an operating temperature range of -40°C to +110°C and high insulation resistance, it is available in 5 models and 6 contact sizes, covering a current range of 2A to 100A to flexibly meet requirements from signal transmission to high-power applications. It complies with the CB1177-87 standard, ensuring reliable quality.

Specifications

Contact Resistance & Rated Current

Applications

1. Sonar Transducer Connection: Used for electrical connections of sonar equipment in deep-water environments.

2. Watertight Junction Box Internal Connection: Serves as a connecting device inside underwater junction boxes to achieve watertight connections between cables.

3. Underwater Equipment and Cable Connection: Connects underwater equipment to its lead-out cables, ensuring a watertight interface.

4. Cable-to-Cable Interconnection: Enables the extension of two underwater cables by connecting them while maintaining overall watertight performance.

Applicable Depth: 0 to 450 meters underwater (fresh or seawater).
Product Models: Available in five models: 30, 39, 52, 56, and 72, with various contact arrangements.

​​​​​​​Key Features

1. Wide operating temperature range: -40℃ ~ +110℃, suitable for extreme cold and hot environments.

2. Strong vibration resistance: Frequency 10~2000Hz, acceleration 196m/s², meeting high-vibration operating conditions.

3. Good shock resistance: Acceleration 100m/s², capable of withstanding mechanical impact.

4. High insulation resistance: ≥500MΩ at normal temperature; ≥100MΩ under damp heat conditions, ensuring electrical safety.

5. High withstand voltage capability: 1500V for standard contacts; 1000V for coaxial contacts.

6. Long mechanical life: 500 mating cycles (O-ring seal life: 100 cycles).

7. Deep water sealing capability: Shallow water type withstands 0~0.5MPa (~50 meters); Deep water type withstands 0~4.5MPa (~450 meters).

8. Multiple contact sizes: Available in 6 diameters: Φ0.8, Φ1.0, Φ1.5, Φ3, Φ4 (coaxial), and Φ5.5.

9. Low contact resistance: Minimum ≤0.0125Ω (as low as ≤0.00075Ω for larger contacts), ensuring low transmission loss.

10. Wide rated current range: Covers 2A to 100A, meeting requirements from signal transmission to high-power applications.

Custom Design

The design of the Standard SM Product centers on deep-water sealing reliability. It ensures stable electrical connections through wire basket contact technology, secure mechanical connections via threaded locking structures, and meets diverse application needs with multiple specifications and models. The overall design is mature, reliable, and compliant with industry standards.

1. Wire Basket Contact Technology: The socket features multiple elastic wires forming a hyperboloid structure, creating multi-point contact with the pin. This provides low contact resistance, smooth insertion and extraction forces, strong vibration resistance, and long service life.

2. Threaded Locking Structure: Achieves tight locking between plug and socket through rotational threading, preventing loosening under vibration, suitable for underwater dynamic or vibrating environments.

3. O-ring Sealing System: O-rings are installed at critical points such as housing mating surfaces and interfacial surfaces, forming multiple waterproof barriers to ensure sealing reliability under deep water pressure.

4. Solder Termination: Wires are connected to contacts via soldering, a mature and reliable process suitable for long-term fixed use.

Why Choose MXTD

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Reliable After-Sales Bolster: You get comprehensive bolster counting fast investigating and standard follow-ups. Our strict quality control forms guarantee item unwavering quality and safety.

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FAQ

Q:How are the cables connected? Is maintenance easy?

A: Both pins and sockets use solder termination for a reliable connection. If maintenance is required, re-soldering can be performed by professionals.

Q:What is the contact resistance? Will it generate excessive heat?

A: Contact resistance is very low, with a minimum of ≤0.0125Ω (as low as ≤0.00075Ω for larger contacts), ensuring low transmission loss and minimal heat generation.

Q: Will the connection loosen under vibration?

A: No. The plug and socket use a threaded coupling mechanism and have passed vibration tests of 10~2000Hz at 196m/s², ensuring a secure and reliable connection.

Q: Will it corrode or leak electricity underwater?

A: It is suitable for both fresh and seawater. The contacts are corrosion-resistant. Insulation resistance is ≥500MΩ at normal temperature (≥100MΩ under damp heat), and withstand voltage is 1500V, ensuring electrical safety.

Q: ​​​​​​​How deep underwater can it be used? How long will it last?

A: The shallow water type withstands 0~0.5MPa (~50 meters), and the deep water type withstands 0~4.5MPa (~450 meters). It uses O-ring seals and maintains watertight integrity throughout its design life (seal life: 100 mating cycles).

Contact Us

     Choose the Standard SM Product because it is specifically designed for underwater depths of 0 to 450 meters, achieving long-term reliable watertight performance through multiple O-ring seals. It features a wire basket contact structure and threaded locking mechanism, ensuring extremely low contact resistance (≤0.0125Ω) and excellent vibration and shock resistance. With a wide operating temperature range of -40℃ to +110℃ and high insulation resistance (≥500MΩ), it provides stable electrical performance. Offering 5 models, 6 contact sizes, and a rated current range of 2A to 100A, it flexibly meets diverse requirements from signal transmission to high-power applications. Its technical performance complies with the CB1177-87 industry standard, ensuring mature technology and reliable quality.

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