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Circular Cable Connectors

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Camera Connection Cable

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Blog Details
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Circular Connector Sizes and Standards

Circular Connector Sizes and Standards

2025-03-28

Circular connectors come in a variety of sizes, typically defined by their shell size (diameter) and the number of contacts (pins or sockets) they accommodate. Here’s a general breakdown of common circular connector sizes:

Standard Shell Sizes (Based on MIL-DTL-5015, MIL-DTL-38999, etc.)

 

These sizes are often measured in inches or millimeters and follow military or industrial standards:

 

Shell Size (Number) Diameter (Approx.) Common Standards Typical Applications
8 ~0.31" (8 mm) Miniature connectors Sensors, aviation, medical
10 ~0.44" (11 mm) MIL-DTL-5015, EN 2997 Industrial, military
12 ~0.50" (12.7 mm) MIL-DTL-5015, M12 Industrial automation (M12 sensors)
14 ~0.69" (17.5 mm) MIL-DTL-5015 Military, aerospace
16 ~0.81" (20.6 mm) MIL-DTL-5015 Heavy-duty industrial
18 ~0.94" (24 mm) MIL-DTL-38999 (Series III) Aerospace, defense
20 ~1.06" (27 mm) MIL-DTL-5015, 38999 High-power applications
22 ~1.25" (32 mm) MIL-DTL-5015 Shipboard, rugged environments
24 ~1.38" (35 mm) MIL-DTL-38999 High-density, military
28 ~1.63" (41.5 mm) MIL-DTL-5015 Large power/data transfer
32 ~1.88" (48 mm) MIL-DTL-5015 Extreme environments

 

Industrial Circular Connectors (Metric Sizes)

  • M5 (~5 mm) – Small sensors, limited space

  • M8 (~8 mm) – Factory automation, IO-Link

  • M12 (~12 mm) – Industrial Ethernet (Profinet, EtherCAT), sensors

  • M16 (~16 mm) – Medium-duty power/signal

  • M23 (~23 mm) – Motor encoders, heavy-duty sensors

  • M40 (~40 mm) – High-power industrial

  •  

Aviation & Military (Common Standards)

  • MIL-DTL-5015 (standard circular threaded connectors)

  • MIL-DTL-38999 (high-reliability, lightweight)

  • MIL-DTL-26482 (quick-disconnect)

  • EN 2997 / AS 2997 (European aviation)

Key Considerations When Choosing Size:

  1. Current/Voltage Rating – Larger connectors handle higher power.

  2. Environmental Sealing (IP67, IP68) – Critical for harsh conditions.

  3. Mating Cycles – Some connectors are rated for thousands of insertions.

  4. Locking Mechanism (threaded, bayonet, push-pull).

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Blog Details
Created with Pixso. Home Created with Pixso. Blog Created with Pixso.

Circular Connector Sizes and Standards

Circular Connector Sizes and Standards

Circular connectors come in a variety of sizes, typically defined by their shell size (diameter) and the number of contacts (pins or sockets) they accommodate. Here’s a general breakdown of common circular connector sizes:

Standard Shell Sizes (Based on MIL-DTL-5015, MIL-DTL-38999, etc.)

 

These sizes are often measured in inches or millimeters and follow military or industrial standards:

 

Shell Size (Number) Diameter (Approx.) Common Standards Typical Applications
8 ~0.31" (8 mm) Miniature connectors Sensors, aviation, medical
10 ~0.44" (11 mm) MIL-DTL-5015, EN 2997 Industrial, military
12 ~0.50" (12.7 mm) MIL-DTL-5015, M12 Industrial automation (M12 sensors)
14 ~0.69" (17.5 mm) MIL-DTL-5015 Military, aerospace
16 ~0.81" (20.6 mm) MIL-DTL-5015 Heavy-duty industrial
18 ~0.94" (24 mm) MIL-DTL-38999 (Series III) Aerospace, defense
20 ~1.06" (27 mm) MIL-DTL-5015, 38999 High-power applications
22 ~1.25" (32 mm) MIL-DTL-5015 Shipboard, rugged environments
24 ~1.38" (35 mm) MIL-DTL-38999 High-density, military
28 ~1.63" (41.5 mm) MIL-DTL-5015 Large power/data transfer
32 ~1.88" (48 mm) MIL-DTL-5015 Extreme environments

 

Industrial Circular Connectors (Metric Sizes)

  • M5 (~5 mm) – Small sensors, limited space

  • M8 (~8 mm) – Factory automation, IO-Link

  • M12 (~12 mm) – Industrial Ethernet (Profinet, EtherCAT), sensors

  • M16 (~16 mm) – Medium-duty power/signal

  • M23 (~23 mm) – Motor encoders, heavy-duty sensors

  • M40 (~40 mm) – High-power industrial

  •  

Aviation & Military (Common Standards)

  • MIL-DTL-5015 (standard circular threaded connectors)

  • MIL-DTL-38999 (high-reliability, lightweight)

  • MIL-DTL-26482 (quick-disconnect)

  • EN 2997 / AS 2997 (European aviation)

Key Considerations When Choosing Size:

  1. Current/Voltage Rating – Larger connectors handle higher power.

  2. Environmental Sealing (IP67, IP68) – Critical for harsh conditions.

  3. Mating Cycles – Some connectors are rated for thousands of insertions.

  4. Locking Mechanism (threaded, bayonet, push-pull).