Dandong Foundry
About Us Casting Products Casting Workshop Machining Workshop Inspection Certificate Blog ArticlesContact Us

    ► Stove & Boiler Metal Parts  
  ► Construction Machinery Parts
  ► Agricultural Machinery Parts
  ► Pump & Valve Metal Parts
  ► Pipe Fittings & Manholes
  ► Other Iron & Steel Castings

 
 
 


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                      

 

 

H

0,1

K

0,2

L

0,5

Home

   © DANDONG FUDING ENGINEERING MACHINERY CO., LTD. All Rights Reserved.
  
SITEMAP | Iron Foundry, Automatic Molding, Green Sand Casting, Resin Sand Casting, Shell Molding, Casting, Iron Castings, Steel Castings, Gray Iron Casting, Ductile Iron Casting, Cast Iron Price