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BLUE SPIRAL MARKING ON HYDRAULIC TUBING

BLUE SPIRAL MARKING ON HYDRAULIC TUBING

BLUE SPIRAL MARKING ON HYDRAULIC TUBING

(OP)
Does anyone know the manufacturer of hydraulic tubing with a blue spiral marking on the outside surface? Or, is there some significance to the marking (i.e. a standard or pressure rating)?

BW

RE: BLUE SPIRAL MARKING ON HYDRAULIC TUBING

Is the tube cold drawn or is it black...metric, imperial or nominal bore?

Hydromech

RE: BLUE SPIRAL MARKING ON HYDRAULIC TUBING

(OP)
Thanks for responding. I'm not sure, but I think it is cold drawn, 1/4" nominal. I am checking that out.

BW

RE: BLUE SPIRAL MARKING ON HYDRAULIC TUBING

(OP)
The specification is for SAE J525 (welded) tubing - .875 OD X .065 Wall.

BW

RE: BLUE SPIRAL MARKING ON HYDRAULIC TUBING

The colour coding is to identify the composition of the material, such as carbon and alloy metal content and grain structure.

This composition becomes critical when the tube is to be welded.

I don't know what the blue spiral indicates..sorry.

Hydromech

RE: BLUE SPIRAL MARKING ON HYDRAULIC TUBING

(OP)
Thank you.

BW

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