
Mil-spec (military specification) circular connectors are designed to meet the stringent requirements necessary for use in harsh environments. These electrical connectors are built to endure extreme conditions such as high vibration, shock, and temperature variations, making them ideal for military, aerospace, and marine applications.

**Key Configurations of Mil-Spec Circular Connectors:**

- **Number of Ways:** Refers to the number of individual electrical circuits that can be connected through the connector, ranging from just a few to several dozen, allowing for versatility in applications.
- **Mounting Type:** These connectors come in various mounting styles, including cable-mounted, panel-mounted, and board-mounted options, providing flexibility in integration and assembly.
- **Contact Gender:** Typically available in male and female configurations, ensuring secure and reliable mating and connectivity.
- **Shell Size:** The connectors are offered in a range of shell sizes to accommodate different numbers of contacts and to suit specific space requirements.
- [**IP Rating**](https://au.rs-online.com/web/content/discovery/ideas-and-advice/ip-ratings)**:** With high ingress protection ratings, these connectors are resistant to dust and moisture, which is crucial for maintaining functionality in outdoor and exposed settings.
- **Voltage Rating:** Designed to handle specific voltage ranges, ensuring safe operation across different electrical systems.
- **Housing Material:** Commonly made from durable materials such as aluminium, stainless steel, or composite plastics, these housings are engineered to resist corrosion and withstand harsh environmental conditions.

## **What Are Mil-Spec Circular Connectors Used For?**

Originally designed to meet rigorous military specifications, mil-spec circular connectors are used in environments where durability is critical. They are commonly found in automotive systems, mobile equipment, and oil and gas applications, where they must withstand rugged conditions. They are engineered for exceptional durability and resistance to extreme factors such as vibration, corrosion, and environmental exposure. This ensures reliable performance when failure can lead to significant operational disruptions.

**Specific Industrial Applications Include:**

- **Aerospace:** Used in aircraft and spacecraft for critical systems requiring robust and secure connections that can handle high and low temperatures and minimise electromagnetic interference.
- **Defence:** Vital for communication and weapon systems, sensors, and other field equipment that require connectors that can endure battlefield conditions and rapid deployment.
- **Maritime:** Employed in ships and submarines, where saltwater corrosion and pressure extremes are common challenges.
- **Transportation:** Essential for rail systems and heavy-duty vehicles that need durable connectors to handle constant vibrations and changing environmental conditions.
- **Robotics and Automation:** Used in robotic arms and automated production lines, where precise and reliable connections are crucial for continuous operation.

## **Types of Mil-Spec Circular Connectors**

Mil-spec circular connectors come in various types, each suited for specific applications and conditions. Here are some common types:

**Series I and Series IV Connectors:**

- Fast disconnect system.
- High vibration resistance.
- Ideal for environments with strong winds and high humidity.

**Series II Connectors:**

- Low profile design.
- Suitable for limited weight or space.
- Best for low-vibration situations.

**Series III Connectors:**

- Withstand high temperatures.
- Excellent vibration resistance.
- Suitable for high winds and humid conditions.

## **Military Connector Types**

Military connectors come in various configurations to meet specific military and industrial requirements. Here are some common types:

**Wall Mounting Receptacle:**

- Designed for secure mounting on walls or panels.
- Ideal for fixed installations where stability and robust connections are needed.
- Commonly used in control panels and bulkhead applications.

**Cable Connecting Receptacle:**

- Connects cables securely, ensuring reliable data and power transmission.
- Used in applications requiring frequent connection and disconnection.
- Suitable for field repairs and modular systems.

**Box Mounting Receptacle:**

- Mounted on equipment boxes to provide a stable connection point, such as [wall boxes](https://au.rs-online.com/web/c/enclosures-server-racks/enclosures/wall-boxes/).
- Used in rugged environments where equipment is subject to movement and vibration.
- Ensures a secure interface between equipment and external cables.

**Straight Plug:**

- Versatile connector used for direct connections to equipment or other cables.
- Available in various sizes and configurations to match specific application needs.
- Often used in field equipment and portable devices.

## **Buying Military Circular Connectors: Ordering & Delivery Information for Australia**

RS is a trusted provider and distributor of military and [industrial circular connectors](https://au.rs-online.com/web/c/connectors/circular-connectors/industrial-circular-connectors/) and plugs, offering mil-spec products from leading brands such as [Amphenol](https://au.rs-online.com/web/c/connectors/circular-connectors/mil-spec-circular-connectors/?applied-dimensions=4294967181), [Souriau](https://au.rs-online.com/web/c/connectors/circular-connectors/mil-spec-circular-connectors/?applied-dimensions=4294965513), and [TE Connectivity](https://au.rs-online.com/web/c/connectors/circular-connectors/mil-spec-circular-connectors/?applied-dimensions=4294725095). Visit our website to place an order, choose the connectors that meet your requirements, and proceed to checkout. The process is straightforward and accommodates both account customers and guest shoppers.

RS ensures prompt and dependable delivery throughout Australia. Please refer to our [Delivery Page](https://au.rs-online.com/web/content/support/all-articles/delivery) for more information on our delivery services and associated fees.



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Amphenol Mil Spec Circular Connectors

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