General Tolerance on Machined Parts

This this the tolerance table intended to simplify drawing indications and specifies general tolerances in four tolerance classes. It applies to the dimensions of work pieces that are produced by metal removal or are formed from sheet metal. It contains three tables and an informative annex with regard to concepts behind general tolerancing of dimensions.

General tolerances for linear measures according to DIN ISO 2768-1

Table one - Permissible deviations for linear dimensions except for broken edges (external radius and chamfer heights)

Designation Description
Permissible deviations for basic size range in mm
from 0.5# upto 3
 Over 3 upto 6 over 6 upto 30 over 30 upto 120 over 120 upto 400 over 400 upto 1000 over 1000 upto 2000 over 2000 upto 4000
f fine
±0,05
±0,05
±0,10
±0,15
±0,20
±0,30
±0,50
Nil
m medium
±0,10
±0,10
±0,20
±0,30
±0,50
±0,80
±1.20
±2.00
c coarse
±0,20
±0,30
±0,50
±0,80
±1.20
±2.00
±3.00
±4.00
v very coarse
Nil
±0,50
±1.00
±1.50
±2.50
±4.00
±6.00
±8.00

Table two - Permissible deviations for broken edges (external radius and chamfer heights)

   
Permissible deviations for basic size range in mm
Designation
Description
from 0.5# upto 3
over 3 upto 6
over 6
f fine
±0,20
±0,50
±1.00
m medium
c coarse
±0,40
±1.00
±2.00
v very coarse

Table three - Permissible deviations for angular dimensions

   
Permissible deviations for ranges of Lengths in mm of shorter side of the angle concerned
Designation
Description
upto 10
over 10 upto 50
over 50 upto 120
over 120 upto 400
over 400
f fine
±1.00°
±0.500°
±0.333°
±0.166°
±0.083°
m medium
c coarse
±1.500°
±1.000°
±0.500°
±0.250°
±0.166°
v very coarse
±3.00°
±2.000°
±1.000°
±0.500°
±0.333°
#For nominal size below 0.5mm the deviation shall be indicated adjacent to the relevant nominal size(s)

General tolerances for form and position

DIN ISO 2768-2 is for simplifying drawing and fixes general tolerances in three tolerance classes for form and position. By choosing a special tolerance class exactly the precision level common in workshops should be taken into account.

General tolerances for straightness and evenness in mm

   
Permissible deviations for basic size range in mm
Designation
Description
upto 10
over 10 upto 30
over 30 upto 100
over 100 upto 300
over 300 upto 1000
over 1000 upto 3000
H  
0.02
0.05
0.10
0.20
0.30
0.40
K  
0.05
0.10
0.20
0.40
0.60
0.80
L  
0.10
0.20
0.40
0.80
1.20
1.60

General tolerances for straightness and evenness in mm

   
Permissible deviations for basic size range in mm
Designation
Description
upto 100
over 100 upto 300
over 300 upto 1000
over 1000 upto 3000
H  
0.20
0.30
0.40
0.50
K  
0.40
0.60
0.80
1.00
L  
0.60
1.00
1.50
2.00

General tolerances for symmetry

   
Permissible deviations for basic size range in mm
Designation
Description
upto 100
over 100 upto 300
over 300 upto 1000
over 1000 upto 3000
H  
0.50
K  
0.6-
0.80
1.00
L  
0.60
1.00
1.50
2.00
   

Note: General tolerances for form and position are valid for form elements for which form and position tolerances are not indicated individually. They are applicable for all characteristics of the form elements accept cylinders, profiles of any line or surfaces, inclines, coaxially, position and total movement. The information contained in this technical data sheet is only intended to inform the reader. Hua Xing Manufacturing Co Ltd can not be held responsible for any misapplication or misjudgment resulting from the use of the information.