Lost wax precision castings

Tolerance quality for product castings in medium large series UNI-ISO 8062

Technology Tolerance Quality CT
Steel Grey cast iron Spheroidal cast iron Malleable cast iron Copper alloys Zinc alloys Light alloys (Al) Alloys + Nickel Alloys + Cobalt
Hand sand moulding 11 to 13 11 to 13 11 to 13 11 to 13 10 to 12 //// 9 to 11 //// ////
Machine sand moulding 8 to 10 8 to 10 8 to 10 8 to 10 //// //// //// //// ////
Shell moulding
Low pressure chill casting //// 7 to 9 7 to 9 7 to 9 7 to 9 7 to 9 6 to 8 //// ////
Pressure die casting //// //// //// //// 6 to 8 4 to 6 5 to 7 //// ////
Lost wax precision casting 5 to 7 //// //// //// 5 to 7 //// 5 to 7 5 to 7 5 to 7
Note: The tolerance quality indicated can be obtained for medium large series, for small series (60-100 pcs) it is advisable to increase the quality level indicated by 1-2 points, e.g.: hand sand moulding from “11 to 13” goes to “12 to 14”

General Tolerances of Castings in mm. UNI-ISO 8062

Nominal quota Tolerance quality of castings CT
> = 4 5 6 7 8 9 10 11 12 13 14 15
0 10 0,26 0,36 0,52 0,74 1 1,5 2 2,8 4,2 //// //// ////
10 16 0,28 0,38 0,54 0,78 1,1 1,6 2,2 3 4,4 //// //// ////
16 25 0,3 0,42 0,58 0,82 1,2 1,7 2,4 3,2 4,6 6 8 10
25 40 0,32 0,46 0,64 0,9 1,3 1,8 2,6 3,6 5 7 9 11
40 63 0,36 0,5 0,7 1 1,4 2 2,8 4 5,6 8 10 12
63 100 0,4 0,56 0,78 1,1 1,6 2,2 3,2 4,4 6 9 11 14
100 160 0,44 0,62 0,88 1,2 1,8 2,5 3,6 5 7 10 12 16
160 250 0,5 0,7 1 1,4 2 2,8 4 5,6 8 11 14 18
250 400 0,56 0,78 1,1 1,6 2,2 3,2 4,4 6,2 9 12 16 20
400 630 0,64 0,9 1,2 1,8 2,6 3,6 5 7 10 14 18 22
630 1000 //// 1 1,4 2 2,8 4 6 8 11 16 20 25
1000 1600 //// //// 1,6 2,2 3,2 4,6 7 9 13 18 23 29
1600 2500 //// //// //// 2,6 3,8 5,4 8 10 15 21 26 33
2500 4000 //// //// //// //// 4,4 6,2 9 12 17 24 30 38
4000 6300 //// //// //// //// //// 7 10 14 20 28 35 44
6300 10000 //// //// //// //// //// //// 11 16 23 32 40 50
Note: The tolerance system described here is applicable to castings in metal alloys with sand or chill moulding, with high or low pressure or lost wax. The values mentioned in the table represent the Tolerance range to be applied when required on the drawing with offset (+/-).
       
Micro-Casting: Design & Tolerances