Tolerance Guide

This guide relates to Miles Platts catalogue items.

Tolerances are in line with DIN16742 and are dependent upon a number of factors.

Factors affecting tolerances,

• The polymer selection and its’ glass content
• The tolerance band is appropriate to the nominal dimension
• The temperature & humidity of parts being measured
• Glass filled engineering polymers are anisotropic and shrink at different rates across different axis
• Where the tool splits and whether the dimension is formed by a solid core or a moving part of the tool
• Which tolerance group being applied which is calculated from a number of factors. 
• Miles Platts catalogue items generally fall into TG6 tolerance group

Other considerations for tolerance guidelines,

• Measurement points may have draft applied and therefore will vary across a surface
• Consideration should be given to radii on edges and internal corners (A)
• Glass filled engineering polymer distorts- unsupported features will toe inwards (A1)

DIN16742:2013-10 Table 2 extract- limit dimensions for nominal size ranges (TG6, non-tool specific dimensions) .

Tolerance limit dimensions are intended for linear dimensions only.