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.
 
Limit dimensions for nominal size ranges (mm)
Tolerance
Group
1 - 3 >3 - 6 >6 - 10 >10 - 18 >18 - 30 >30 - 50 >50 - 80 >80 - 120 >120 - 250
TG6 ± 0.12 ±0.18 ±0.22 ±0.26 ±0.31 ±0.37 ±0.57 ±0.80 ±1.05




 
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