What is DIN16742 ?
DIN16742 is a tolerance standard for definition of possible manufacturing tolerances for plastic moulded parts.
It is edited by working committee (NA 054-05-13 AA Tolerances for plastics moulded parts) of the Plastics Standards Committee (FNK).
It involves limit dimensions for size dimensions (two-point dimensions) as indirect tolerancing (general tolerances) and as direct tolerancing (indication of deviation at nominal size dimension).
For tolerancing of form deviation and positional deviation, profile form tolerances act as general tolerances and position tolerances for the direct tolerancing by cylindrical tolerance zone.
An analogous application of the standard is possible for special process variants, if this was agreed with the moulded part manufacturer.
Porous moulded parts (e. g. cellular plastics) as well as other moulding and processing methods do not belong to the scope of this standard. The same applies for process combinations from the original mould and forming methods (e. g. injection moulding blowing). Permissible tolerances are to be agreed for porous moulding materials.
If tolerances are required beyond the scope of the standard, these shall be agreed with the moulded part manufacturer and specified on the drawing.
Plastic Moulded Part Tolerance as symmetrical limit dimensions for sizes
Plastic Moulded Part Tolerances for Position Tolerances
