国 上海文通大学 Bolt Standardization 口 Metric Mechanical-Property Classes for Steel Bolts,Screws,and Studs Minimum Minimum Size Proof Tensile Yield MPa Material Head Marking 4.6 M5-M36 225 400 240 Low or medium carbon 、46） M1.6-M16 310 420 340 Low or medium carbon 58 M5-M24 380 520 420 Low or medium carbon 8.8 MI6-M36 600 830 Medium carbon,Q&T Table 8-11 周 上海充通大学 Bolt Standardization 口 Dimensions of Square and Hexagonal Bolts Hoad Type Squar Regular Hexagonal y Hexagonal Structural Hexag nal H M5 3.58 3.58 02 Mo 10 4.38 03 M8 13 5.68 04 M10 16 6,85 04 M12 18 7.95 0.6 21 7.95 0.6 M14 9.25 MI6 10.75 0 47 10.75 10.75 0.6 M20 0 13.40 0 1340 M24 15.90 15.90 08 4 15.90 10 M30 46 19.75 10 2355 0 19.75 M36 1.0 23.55 H Table E-29 66  Metric Mechanical-Property Classes for Steel Bolts, Screws, and Studs Bolt Standardization Table 8-11  Dimensions of Square and Hexagonal Bolts Bolt Standardization Table E-29