ISO 2768 Standard for Machining Tolerance
ISO Tolerances For Fasteners | ISO Tolerance Chart | ISO & Metric Standards | ISO Steel Pipe Tube and Fittings Standard | ISO 2768 | ISO 8062 BS6615 Casting Tolerance Standard | Rough Casting Tolerance
What standard can be used for the machining of iron and steel casting?
We found many drawing 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
|
