ISO 2768 Standard for Machining Tolerance
Today we will introduce the standards used for steel castings.
We found that many drawings or required documents require ISO 2768 as a processing standard. We looked up a lot of copywriting on the Internet. Fortunately, we found some free and available standard documents. Please check the attachment, it is an ISO 2768 standard document.
We believe that the standard document can only show us approximate tolerance requirements. For critical dimensions, you should clearly indicate on the drawing. In addition, for some dimensions that do not need to be very strict, you should also specify. This may reduce the supplier’s defective rate. As a result, your supplier will not demand more costs because of its high defective rate. This will benefit both customers and suppliers. All in all, this standard is only used for general tolerances in machining. You should not make it an absolute requirement for every size.
ISO 2768 – 1
|v||Meget grov||Sehr grob||Very coarse|
|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|
|f||± 1°||± 30′||± 20′||± 10′||± 5′|
|c||± 1° 30′||± 1°||± 30′||± 15′||± 10′|
|v||± 3°||± 2°||± 1°||± 30′||± 20′|
Fillets and chamfers
|f||± 0,2||± 0,5||± 1|
|c||± 0,4||± 1||± 2|
Rectangular angle measure
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