14A-16 Service Information Guide (All) Note Refer to the following list for the indicators used on standard bolt heads.
Strength category 8.8 9.8 9T Bolt head shape M18 - M24 Hex bolt Flange bolt Hex bolt Flange bolt M18 x 1.5 ： 222.5 to 334.3 N・m { 22.7 to 34.1 kgf・m / 164 to 247 lb・ft } ― ： 229.5 to 345.2 N・m { 23.4 to 35.2 kgf・m / 169 to 255 lb・ft } ― *M18 x 2.5 ： 223.6 to 335.4 N・m { 22.8 to 34.2 kgf・m / 165 to 247 lb・ft } ― ： 230.5 to 346.2 N・m { 23.5 to 35.3 kgf・m / 170 to 255 lb・ft } ― M20 x 1.5 ： 307.4 to 461.7 N・m { 31.3 to 47.1 kgf・m / 227 to 341 lb・ft } ― ： 293.2 to 440.3 N・m { 29.9 to 44.9 kgf・m / 216 to 325 lb・ft } ― *M20 x 2.5 ： 284.0 to 472.1 N・m { 29.0 to 48.1 kgf・m / 209 to 348 lb・ft } ― ： 293.2 to 440.3 N・m { 29.9 to 44.9 kgf・m / 216 to 325 lb・ft } ― M22 x 1.5 ： 413.6 to 620.5 N・m { 42.2 to 63.3 kgf・m / 305 to 458 lb・ft } ― ： 424.6 to 636.5 N・m { 43.3 to 64.9 kgf・m / 313 to 469 lb・ft } ― *M22 x 2.5 ： 385.7 to 578.0 N・m { 39.3 to 58.9 kgf・m / 284 to 426 lb・ft } ― ： 394.2 to 592.3 N・m { 40.2 to 60.4 kgf・m / 291 to 437 lb・ft } ― M24 x 2 ： 490.8 to 810.5 N・m { 50.0 to 82.6 kgf・m / 362 to 598 lb・ft } ― ： 554.1 to 830.6 N・m { 56.5 to 84.7 kgf・m / 409 to 613 lb・ft } ― *M24 x 3 ： 462.8 to 693.1 N・m { 47.2 to 70.7 kgf・m / 341 to 511 lb・ft } ― ： 520.7 to 781.6 N・m { 53.1 to 79.7 kgf・m / 384 to 576 lb・ft } ―