Semi-Finished Products

Fiber in (Stainless) Steel Tube (FIST) part no.

Used for stationary installation when the optical fiber needs extra protection from mechanical damages.


Optical fiber


Marking thread


Water-blocking gel


Stainless steel tube

Up to 48 optical fibers in a tube

Small size

Fiber count up to 1...48
Outer diameter, in 0.043 … 0.276
Inner diameter, in 0.031 … 0.244
Module wall thickness, in 0.006
Optical fiber excessive length, % 0...0.8
Material of steel module (Stainless steel) 1.4301. 1.4404
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Operation temperature -76°F … 158°F
Installation temperature -22°F … 122°F
Transportation and storage temperature -76°F … 158°F
Minimum bending radius 25x cable diameter
Life time 25 years