Generally, cylindrical parts produced by powder metallurgy

Generally, cylindrical parts produced by powder metallurgy should not have non-uniform cross section and length to diameter ratio exceeding.

1. Generally cylindrical parts produced by powder metallurgy should have length to diameter ratio less than or equal to 2.5
2. Generally cylindrical parts produced by powder metallurgy should have length to diameter ratio less than or equal to 3.5
3. Generally cylindrical parts produced by powder metallurgy should have length to diameter ratio less than 2.5
4. None of the above

Generally cylindrical parts produced by powder metallurgy should have length to diameter ratio less than or equal to 2.5