Limits, Tolerances and Fits 235
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d:\N-Design\Des15-2.pm5
a – Correct b – Correct c – Incorrect
d – Correct e – Correct
Fig. 15.18 Indication of feature controlled (outline or surface only)
15.5.9 Standards Followed in Industry
Comparison of systems of indication of tolerances of form and of position as per IS: 3000
(part-1)-1976 and as prevalent in industry are shown in Table 15.8.
Table 15.8 Systems of indication of tolerances of form and of position
As per the standard As prevalent in industry
- Straightness tolerance
- f0.08
Permissible
unstraightness 0.08
- Flatness tolerance
0.08
Permissible
unevenness 0.08
- Circularity tolerance
O 0.1
Permissible
ovality 0.2
(Contd.)