EN 20 898-2 Table 4 - Limits of Chemical Composition, %   Property class C max. Mn min. P max. S max. 4;5;6   0.50   0.060 0.150 8;9 04 0.58 0.25 0.060 0.150 10 05 0.58 0.30 0.048 0.058 12   0.58 0.45 0.048 0.058   EN 20898-2 Table 5 - Mechanical Properties   Thread 04   05 4 Sp Hardness HV Nuts Sp Hardness HV Nuts Sp Hardness HV Nuts >   ≤ N/mm2 min. max. state style N/mm2 min. max. state style N/mm2 min. max. state style   M4 380 188 302 NQT thin 500 272 353 QT thin   M4 M7 M7 M10 M10 M16 M16 M39 510 117 302 NQT 1   Thread 5 6 Sp Hardness HV Nuts Sp Hardness HV Nuts >   ≤ N/mm2 min. max. state style N/mm2 min. max. state style   M4 520         600 150 302 NQT 1 M4 M7 580 670 130 302 NQT 1 M7 M10 590         680 M10 M16 610         700 M16 M39 630 146       720 170       8 Sp Hardness HV Nuts Sp Hardness HV Nuts N/mm2 min. max. state style N/mm2 min. max. state style 800 180 302 NQT 1           855 200 870 880 920 233 353 QT 890 180 302 NQT 2   Thread 9 10 Sp Hardness HV Nuts Sp Hardness HV Nuts >   ≤ N/mm2 min. max. state style N/mm2 min. max. state style   M4 900 170 302 NQT 2 1 040 272 353 QT 1 M4 M7 915 188 1 040 M7 M10 940 1 040 M10 M16 950 1 050 M16 M39 920 1 050   10 12 Sp Hardness HV Nuts Sp Hardness HV Nuts N/mm2 min. max. state style N/mm2 min. max. state style 1 140 295 353 QT 1 1 150 272 353 QT 2 1 140 1 150 1 140 1 160 1 170 1 190   1 200   Sp:Stress under proof NQT: Not quenched or tempered 　　style 1: for nuts ISO 4032 QT: Quenched or tempered 　　style 2: for nuts ISO 4033