How to Identify LEMO Push-pull Self-locking Connectors？

LEMO push-pull self-locking connector is a cylindrical connector with a unique push-pull self-locking system structure invented by Swiss LEMO. It was born in Switzerland in 1946. With its high density, plug-in resistance and anti-interference characteristics, it has become the “gold standard” in high-end fields such as medical equipment, military communications, aerospace, etc. It is widely used in medical equipment, industrial control, detection and measurement equipment, AV systems, radio and television and communications, nuclear industry and military industry, semiconductor manufacturing and other fields.

However, its complex model system (such as B series, K series, S series, E series) and the current market situation of rampant equivalents often put users in identification difficulties. This article will take you through 5 core questions to master the identification code of LEMO connectors.

Q1. How to identify a LEMO connector from its appearance?

🙋‍♂️A: The appearance of a LEMO connector has distinct features. First, its shape is cylindrical, and the shell usually has a “chocolate block” pattern, which is its internationally recognized brand logo, but domestic equivalents also have many other patterns such as fish scales, circles, etc.

Q2. How to identify the series of LEMO connectors?

🙋‍♂️A: According to different application scenarios and environments, LEMO connectors are divided into many different series, among which the most common are the metal-style B\K\S\E series. The B series and K series have similar appearances and the same contact arrangements, but the K series has a waterproof rating of up to IP66-IP68, suitable for outdoor and harsh environments; the S series and E series also have similar appearances and the same contact arrangements, and the key point that distinguishes them from the B/K series is that they have a half-moon-shaped insulation core positioning.

Q3. How to distinguish between original LEMO products and imitations?

🙋‍♂️A: The “LEMO” name and the first 5 characters of the part number are laser engraved on the shell of the original LEMO product.

Q4. What do the letters and numbers in the LEMO part number mean?

🙋‍♂️A: The letters and numbers in the LEMO part number refer to different appearance styles, sizes and materials. Take FGG.0B.302.CLAD52 as an example:

• FGG: model type
• 0B: 0=size B=series
• 302: contact configuration
• CLAD52: C=shell material (chrome-plated brass), L: insulator material (PEEK), A: pin core type (welding male pin), D52: wire clamp type and size code

Q5. How to distinguish between Lemo connector and Fischer connector?

🙋‍♂️A: Locking mechanism: Both LEMO and FISCHER are push-pull self-locking connectors, but the locking mechanism structure is different, refer to the figure below.

Q6. What are the common sizes of LEMO connectors?

🙋‍♂️A: Size code (first two digits):

• 00: outer diameter about 7mm
• 0: outer diameter about 9mm
• 1: outer diameter about 12mm
• 2: outer diameter about 15mm
• 3: outer diameter about 18mm
• 4: outer diameter about 25mm
• 5: outer diameter about 35mm

Summary of steps

1. Observe the appearance and locking method (LEMO is preferred for push-pull type).
2. Check the shell marking (LEMO trademark + model code).
3. Analyze the application scenario according to the model rules.
4. Measure the dimensions and count the number of contacts.
5. Consult professional channels (if unable to confirm).

Advanced suggestions:

Download the LEMO Product Identification Manual (available on the official website);

Attend the LEMO annual technical seminar (including physical disassembly training);

Follow the updates of the IEC 61076-2-113 standard.

Through the systematic identification system, you will be able to accurately analyze the genetic code of each LEMO connector like a Swiss watchmaker.