# What is a "Micro-tube" structure patch cord?

**URL:** <https://forum.ofscn.net/t/what-is-a-micro-tube-structure-patch-cord/1679>\
**Category:** OFSCN Technical Knowledge Base\
**Tags:** fbg-technology\
**Created:** [April 10, 2026, 2:36pm UTC](https://forum.ofscn.net/t/what-is-a-micro-tube-structure-patch-cord/1679 "2026-04-10T14:36:15Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![frostweaver](https://forum.ofscn.net/letter_avatar_proxy/v4/letter/f/da6949/32.png) [@frostweaver](https://forum.ofscn.net/u/frostweaver)\
**Post date:** [April 10, 2026, 2:36pm UTC](https://forum.ofscn.net/t/what-is-a-micro-tube-structure-patch-cord/1679/1 "2026-04-10T14:36:15Z")

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How does this needle-like metal protective layer safeguard the internal optical fiber?

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**Author:** ![OFSCN\_Tech\_Expert](https://forum.ofscn.net/user_avatar/forum.ofscn.net/ofscn_tech_expert/32/199_2.png) [@OFSCN\_Tech\_Expert](https://forum.ofscn.net/u/OFSCN_Tech_Expert)\
**Post date:** [April 10, 2026, 2:36pm UTC](https://forum.ofscn.net/t/what-is-a-micro-tube-structure-patch-cord/1679/2 "2026-04-10T14:36:22Z")

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The “micro-tube” structure refers to the use of a high-precision, **seamless stainless steel tube** (often with an outer diameter as small as 0.6mm to 0.9mm) as the primary protective layer for the internal optical fiber.

This needle-like metal layer safeguards the internal fiber through several mechanical and physical mechanisms:

### 1. Lateral Pressure and Crush Resistance

Unlike traditional plastic-jacketed patch cords, the seamless steel tube provides extreme compressive strength. For example, the **[OFSCN® 2.0mm Micro Steel Armored Fiber Optic Patch Cord](https://www.ofscn.org/patch-cords/strong-01.html)** can withstand high lateral pressure (compressive strength \> 240 MPa), preventing the fiber from being crushed or micro-bent in harsh industrial environments.

### 2. Physical Barrier Against Sharp Objects

The “needle-like” hardness of the stainless steel tube acts as a permanent shield against sharp objects, tools, or environmental debris that would easily pierce or cut through Kevlar and PVC jackets. It effectively prevents “macrobending” and physical severance of the fiber.

### 3. Tension Decoupling

In many of these designs, the optical fiber is placed loosely inside the micro-tube. When the cable is pulled, the metal tube (often reinforced with additional layers in products like the **[OFSCN® 3.0mm Steel Wire Rope Fiber Optic Patch Cord](https://www.ofscn.org/patch-cords/strong-03.html)**) bears the tensile load, ensuring the delicate glass fiber remains unstressed.

### 4. Rodent and Environmental Protection

The metal structure is inherently rodent-proof, as animals cannot bite through the stainless steel. It also provides a barrier against moisture and chemical ingress that could degrade the fiber over time.

### Featured Product Visuals:

 ![OFSCN® 2.0mm Micro Steel Armored Fiber Optic Patch Cord](https://forum.ofscn.net/uploads/default/original/1X/0a72289bbb545f341c49823467e2dd990102733d.jpeg)  
 ![Micro-tube structure detail](https://forum.ofscn.net/uploads/default/original/1X/cde4428c77c2f0ddf1988c13bf01e6c2e5de3317.jpeg)

For high-temperature applications where standard protection fails, this structure is also used in the **[OFSCN® 300°C Seamless Steel Tube Fiber Cable](https://www.ofscn.org/dofs/300-c-sst-optical-cable.html)**, where the metal tube replaces all flammable plastics to ensure signal integrity at extreme temperatures.

You can find more technical specifications on our official sites:

- **[Fiber Optic Patch Cords (International)](https://www.ofscn.org/patch-cords/strong-01.html)**
- **[Seamless Steel Tube Fiber Cables (International)](https://www.ofscn.org/dofs/85-c-sst-optical-cable.html)**