View: Time: 2017-6-6 15:07:38
General tolerances for linear and angular dimensions without individual tolerance indications ISO 2768-1:1989
All features on component parts always have a size and a geometrical shape. For the deviation of size and for the deviations of the geometrical characteristics (form,orientation and location) the function of the part requires limitations which, when exceeded, impair this function.The tolerance on the drawing should be complete to ensure that the elements of size and geometry of all features are controlled, i.e. nothing shall be implied or left to judgement in the workshop or in the inspection department.The use of general tolerances for size and geometry simplifies the task of ensuring that this prerequisite is met.
General tolerances for linear dimensions are given in Table 1 and Table 2.
The permissible deviations of angular dimensions are given in Table 3.
Table 1 — Permissible deviations for linear dimensions except for broken edges | |||||||||
(external radii and chamfer heights, see Table 2) | |||||||||
Tolerance calss | Permissible deviations for basic size range | ||||||||
Designation | Description | 0.5 up to 3 | over 3 up to 6 | over 6 up to 30 | over 30 up to 120 | over 120 up to 400 | over 400 up to 1000 | over 1000 up to 2000 | over 2000 up to 4000 |
f | fine | ±0.05 | ±0.05 | ±0.1 | ±0.15 | ±0.2 | ±0.3 | ±0.5 | -- |
m | medium | ±0.1 | ±0.1 | ±0.2 | ±0.3 | ±0.5 | ±0.8 | ±1.2 | ±2 |
c | coarse | ±0.2 | ±0.3 | ±0.5 | ±0.8 | ±1.2 | ±2 | ±3 | ±4 |
v | very coarse | -- | ±0.5 | ±1 | ±1.5 | ±2.5 | ±4 | ±6 | ±8 |
For nominal sizes below 0,5 mm, the deviations shall be indicated adjacent to the relevant nominal size(s). |
Table 2 — Permissible deviations for broken edges (external radii and chamfer heights) Tolerance calss Permissible deviations for basic size range Designation Description 0.5
up to
3 over
3
up to
6 over 6 f fine ±0.2 ±0.5 ±1 m medium c coarse ±0.4 ±1 ±2 v very coarse aFor nominal sizes below 0,5 mm, the deviations shall be indicated adjacent to the relevant nominal size(s).
Table3-permissible deviations of angular dimensions | ||||||
Tolerance class | permissible deviations for ranges of lengths,in millimetres of shorter side of the angle concerned | |||||
Designations | Descriptions | up to 10 | over 10up to 50 | over 50 up to 120 | over 120 up to 400 | over 4 |
f | fine | ±1° | ±0°30´ | ±0°20´ | ±0°10´ | ±0°5´ |
m | medium | |||||
c | coarse | ±1°30´ | ±1° | ±0°30´ | ±0°15´ | ±0°10´ |
v | very coares | ±3° | ±2° | ±1° | ±0°30´ | ±0°20´ |
No.4, North 2nd Road, Chikan Industrial Park, Shipai Town, Dongguan City, Guangdong Province,China.
+86-769-81707676
+86-769-81819256
LEL@kgicn.com LEL@kgicn.cn LEL@dgkinggold.com