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ISO 2768 Standard for Machining
Tolerance
What standard can be used for the machining of iron
and steel castings?
We found many drawings or requirement files will
require the ISO 2768 as the standard for the
machining. Therefore, we have to go to internet to
look for it. Luckily, we found some free usable
standard files. Please check the attached file, it
is ISO 2768 standard file.
In my opinion, this standard file can just show us
the approximate tolerance requirements. For the key
dimensions, you should denoted on the drawings
clearly. Moreover, for some dimensions which do not
need very strict, you should denoted too. This maybe
could reduce the defective rate for your suppliers.
As a result, you suppliers will not ask for more
costs because of their high defective rate. This
will be benefited for both of client and supplier.
All in all, this standard is just for a general
tolerance for machining. You should not take it as
an absolute requirements for every dimensions.
ISO 2768 - 1
|
|
DK |
DE |
UK |
|
f |
Fin |
Fein |
Fine |
|
m |
Middel |
Mittel |
Medium |
|
g/c |
Grov |
Grob |
Coarse |
|
v |
Meget grov |
Sehr grob |
Very coarse |
length
|
|
-3 |
-6 |
-30 |
-120 |
-400 |
-1000 |
-2000 |
-4000 |
|
f |
± 0,05 |
± 0,05 |
± 0,1 |
± 0,15 |
± 0,2 |
± 0,3 |
± 0,5 |
- |
|
m |
± 0,1 |
± 0,1 |
± 0,2 |
± 0,3 |
± 0,5 |
± 0,8 |
± 1,2 |
± 2 |
|
g/c |
± 0,2 |
± 0,3 |
± 0,5 |
± 0,8 |
± 1,2 |
± 2 |
± 3 |
± 4 |
|
v |
- |
± 0,5 |
± 1 |
± 1,5 |
± 2,5 |
± 4 |
± 6 |
± 8 |
angle
|
|
-10 |
-50 |
-120 |
-400 |
400- |
|
f |
± 1° |
± 30' |
± 20' |
± 10' |
± 5' |
|
m |
|
c |
± 1°
30' |
± 1° |
± 30' |
± 15' |
± 10' |
|
v |
± 3° |
± 2° |
± 1° |
± 30' |
± 20' |
fillets and chamfers
|
|
-3 |
-6 |
6- |
|
f |
± 0,2 |
± 0,5 |
± 1 |
|
m |
|
c |
± 0,4 |
± 1 |
± 2 |
|
v |
plainness
|
|
-10 |
-30 |
-100 |
-300 |
-1000 |
-3000 |
|
H |
0,02 |
0,05 |
0,1 |
0,2 |
0,3 |
0,4 |
|
K |
0,05 |
0,1 |
0,2 |
0,4 |
0,6 |
0,8 |
|
L |
0,1 |
0,2 |
0,4 |
0,8 |
1,2 |
1,6 |
rectangular angle measure
|
|
-100 |
-300 |
-1000 |
-3000 |
|
H |
0,2 |
0,3 |
0,4 |
0,5 |
|
K |
0,4 |
0,6 |
0,8 |
1 |
|
L |
0,6 |
1 |
1,5 |
2 |
symmetry
|
|
-100 |
-300 |
-1000 |
-3000 |
|
H |
0,5 |
|
K |
0,6 |
0,8 |
1 |
|
L |
0,6 |
1 |
1,5 |
2 |
symmetry
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