18 products
MIL-DTL-38999 connector
38999 Series

TV-CTV - D38999 Series III

Tri-start thread connector, MIL-DTL-38999 series III qualified

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EN3645 connector Amphenol socapex
38999 Series

EN3645

European standard similar to MIL-DTL-38999 Series III

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387TV
38999 Series

387TV Series - size 7 connector

Double-start thread miniature connector, Derived from MIL-DTL-38999 series III

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powersafe BZN
38999 Series

Powersafe - VG96944

High Power with Safety design connector, Derived from MIL-DTL-38999 series III

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RNJ reduced Flange
38999 Series

RNJ - Reduced Flange

When size and weight are critital for blind mate applications

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38999 Amphenol
38999 Series

LJT - HE308 - 38999 Series I

MIL-DTL-38999 Series I & HE308 qualified

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38999 Connectors
38999 Series

JT - 38999 Series II

MIL-DTL-38999 Series II qualified

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38999 connectors
38999 Series

RNJ - HE308 - Rack & Panel

Rack & Panel Blind Mate connector for harsh environments

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Amphenol Socapex is a renowned leader in providing high-performance circular connectors, including D38999, 2M Micro Miniature, Rugged Ethernet, USB, Display, RFM, and PT/451 connectors, tailored for a wide range of critical applications within the defense and aerospace sectors. These electrical connectors are engineered to meet the rigorous demands of industrial and military environments, offering exceptional durability, reliability, and data transmission capabilities. 
Our circular connectors, such as the D38999 series, are trusted by defense and aerospace professionals worldwide for their robust design and superior electrical connectivity. The Rugged Ethernet, USB, and Display connectors ensure seamless communication in mission-critical scenarios. Additionally, our RFM and PT/451 connectors excel in RF and power applications, respectively, guaranteeing optimal performance under extreme conditions.
Amphenol Socapex's commitment to delivering top-tier circular and ethernet connectors for industrial and military applications makes us the preferred choice for those seeking dependable, cutting-edge solutions. Trust us to provide the connectivity solutions your projects demand, ensuring reliability and mission success.

What is mil c 38999 standard?


MIL-C-38999 is now superseded by MIL-DTL-38999. This is a standard for high performance circular connectors designed for cable-to-panel I/O applications in military, aerospace and other demanding situations. There are four connector series in the family:

  • Series I: Bayonet coupling – Amphenol’s LJT series

  • Series II: Low-Profile Bayonet coupling – Amphenol’s JT series

  • Series III: Tri-Start ACME Thread – Amphenol’s TV-CTV series

  • Series IV : Breech-Lock

What is mil-dtl-38999?


MIL-DTL-38999 is a standard for high performance circular connectors designed for cable-to-panel I/O applications in military, aerospace and other demanding situations. There are four connector series in the family:

  • Series I: Bayonet coupling – Amphenol’s LJT series

  • Series II: Low-Profile Bayonet coupling – Amphenol’s JT series

  • Series III: Tri-Start ACME Thread – Amphenol’s TV-CTV series
  • Series IV : Breech-Lock 

What is a d38999 connector?
A D38999 connector is an abbreviation of MIL-DTL-38999 series III connectors, as part numbering or marking defined by the standard always begins with D38999/…
MIL-DTL-38999 series III connectors (Amphenol TV / CTV series) are thread coupling connectors, with 100% scoop proof design. Metal and composite shell versions are available. EN3645 is the corresponding European standard for this series.

What is the difference between RJ11 and RJ45?
The main differences between RJ11 and RJ45 connectors lie in their design and usage:

  1. Shape and Contacts: RJ11 connectors are smaller and typically have 4 to 6 pins, while RJ45 connectors are larger with 8 pins. The difference in the number of contacts is due to their specific functions—RJ11 is designed for simpler applications, whereas RJ45 supports more complex connections.
  2. Usage: RJ11 is commonly used for traditional telephone lines and fixed telephony systems. In contrast, RJ45 is primarily used in communication networks, including Ethernet connections, and can also support telephony in more advanced systems.

Are Cat 6 and Cat 5 connectors the same?
The connectors for Cat 5 and Cat 6 cables are identical in shape, both using the RJ45 standard. However, the key difference lies in their performance capabilities. Cat 5 cables support speeds of 10-100 Mbps at a frequency of 100 MHz, while Cat 6 cables are designed to handle speeds up to 1 Gbps (1000 Mbps) at a frequency of 250 MHz.

What is d38999 in line connector?
A D38999 in line connector is a receptacle supplied with no flange for fixing on a panel. It means a cable to cable connexion.
Amphenol’s designation will always begin by TV01 or TVS01.

Is mil c the same as mil dtl?
MIL-C-38999 is now superseded by MIL-DTL-38999. This is a standard for high performance circular connectors designed for cable-to-panel I/O applications in military, aerospace and other demanding situations. There are four connector series in the family:
•    Series I: Bayonet coupling – Amphenol’s LJT series
•    Series II: Low-Profile Bayonet coupling – Amphenol’s JT series
•    Series III: Tri-Start ACME Thread – Amphenol’s TV-CTV series
•    Series IV : Breech-Lock

Do d38999 connectors come with contacts?
D38999 connectors can be supplied with or without contacts. For example :
•    D38999/26A35PN will come with pin contacts
•    D38999/26A35SN will come with socket contacts
•    D38999/26A35AN will come without pin contacts
•    D38999/26A35BN will come without socket contacts
Please note that a connector ordered without contacts will be marked with P or S code, as required by MIL-DTL-38999 standard.

How do i choose a circular connector?
There are many steps to choose a circular connector, we have tried to summarize the relevant ones:
1)    How many ways it needs to have, and which current / voltage needs to pass through
2)    In which environment it will be used : Temperature, sealing, vibrations, salt spray resistance…
3)    What’s the mating style : Threaded, push-pull, bayonet, blind mate…
4)    Which space is available with your devices
This will surely guide you to one or few connector’s series. For any further help, you can consult our help center or contact our technical support team (+ lien support).

What are the 3 types of connectors?
The 3 main series of MIL-DTL-38999 connectrs are:
•    Series I: Bayonet coupling – Amphenol’s LJT series
•    Series II: Low-Profile Bayonet coupling – Amphenol’s JT series
•    Series III: Tri-Start ACME Thread – Amphenol’s TV-CTV series

What are rugged connectors?
Rugged connectors are high-performance connectors designed for use in harsh environments, including military, aerospace, and industrial sectors. Built to withstand extreme conditions such as heavy vibration, exposure to dust, moisture, and temperature fluctuations, rugged connectors ensure reliable and durable connections in mission-critical applications. They feature corrosion-resistant materials, strong sealing, and secure locking mechanisms, making them ideal for demanding environments where standard connectors would fail. Rugged connectors are essential for applications that require robust, long-lasting connectivity solutions in challenging conditions.


What is a circular connector?
Circular connectors are versatile, multi-pin connectors commonly used in industrial, military, and aerospace applications. They provide reliable connections in harsh environments, offering various contact configurations and a space-efficient design. Amphenol Socapex’s 38999 Series and PT/451 Series are examples, known for their durability and reliability. These connectors are ideal for applications requiring strong environmental resistance and high performance.

What is the military standard for connectors?
Military connectors must meet rigorous standards such as MIL-DTL, ensuring their ability to withstand extreme environments and provide reliable performance in defense applications