CLASSI DI RESISTENZA

Classi di resistenza	ø Filettatura mm	Esempi di acciai utilizzabili
Resistance class	ø Thread mm	Examples of steels which can be used
4.8	≤ 35	C4C – C1OC
5.8	≤ 15	C10C
	≤ 35	C20E2C
6.8	≤ 13	C20E2C
8.8**	≤ 11	19MnB4 – C23B – 35B2 – 28B2
	≤ 21	35B2 – 30MnB3
	≤ 27	34Cr4 – 34CrMo4
	≤ 27	41Cr4 – 42CrMo4
10.9**	≤ 16	35B2 – 30MnB3
	≤ 20	34Cr4 – 34CrMo4
	≤ 27	41Cr4 – 42CrMo4
12.9**	≤ 18	34Cr4 – 42CrMo4
	≤ 22	41Cr4 – 42CrMo4
** Bonifica obbligatoria
** Hardening and tempering compulsory