It concerns the tolerances and allowances of seamless sleeves obtained by stretching, upsetting, hot drilling and widening with the press or hammer, of steel (see UNI EU 20) for construction or for tools with c less than or equal to 0.9%. and with a total alloying element content of less than or equal to 4%. Material. Examples of calculating rough forging dimensions (see UNI 4767 and UNI 7272).
UNI 7735-1978 history
1978UNI 7735-1978 Hot forged finished steel products. Seamles bushes. Tolerances and machining allowances.