Question for advice

2022-02-22View Original

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The attached diagram is a schematic of a steel structure. Could you please explain what the triangle in the red circle and the number 25 mean?

Reply #22022-02-23

Roughness grade of the inner surface of a hole with a diameter of 22 mm

Reply #32022-02-24

I’m just telling you that this hole needs to be machined. It’s not fire; a simple cut will do. Looking at the main diagram and the plans, they are quite good – very detailed.

Reply #42022-12-13

Diameter of hole 22: turned, surface roughness 25

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