State whether the diameter is ID or OD
ID identifies an inside diameter; OD identifies an outside diameter. Label the basis next to the value so it is not inferred from a photograph or title.
- Write the measurement basis explicitly.
- State mm, in or the project unit.
- Keep the original value and unit when communicating a drawing.
Separate depth, total height and straight flange
These dimensions describe different parts of the profile. Show the measurement limits on the section drawing instead of combining them into one “height” value.
- Crown depth.
- Overall height.
- Straight-flange dimension.
- Crown and knuckle radii, where applicable.
Define the thickness basis
Nominal plate thickness and a minimum thickness after forming are different requirements. State the intended basis and any acceptance criteria on the drawing.
Check the drawing package
Use one clear revision for the enquiry and identify any dimensions still open for discussion.
- Part or drawing reference and revision.
- Material specification and grade.
- Dimensions, units and tolerances.
- Quantity and required inspection documents.