Bolt dimension GB/T 1228
d | 12 | 16 | 20 | 22 | 24 | 27 | 30 |
s | 21 | 27 | 34 | 36 | 41 | 46 | 50 |
K | 7.5 | 10 | 12.5 | 14 | 15 | 17 | 18.7 |
L | 35~75 | 45~130 | 50~160 | 55~220 | 60~240 | 65~260 | 70~260 |
（KN）Tensile Load
M12 | M16 | M20 | M22 | M24 | M27 | M30 | Bolt Hardness | |
8.8s | 70~86.8 | 130~162 | 203~252 | 251~312 | 293~364 | 381~473 | 466~518 | HRC24~HRC31 |
10.9s | 87.7~104.5 | 163~195 | 255~304 | 315~376 | 367~438 | 477~569 | 583~696 | HRC33~HRC39 |
Nut dimension GB/T 1229
d | 12 | 16 | 20 | 22 | 24 | 27 | 30 |
S | 21 | 27 | 34 | 36 | 41 | 46 | 50 |
M | 12.3 | 17.1 | 20.7 | 23.6 | 24.2 | 27.6 | 30.7 |
E | 22.8 | 29.6 | 37.3 | 39.6 | 45.2 | 50.9 | 55.4 |
（KN) Load holding
M12 | M16 | M20 | M22 | M24 | M27 | M30 | Nut Hardness | |
8H | 70 | 130 | 203 | 251 | 293 | 381 | 466 | HRB96~HRC22 |
10H | 87.7 | 163 | 255 | 315 | 367 | 477 | 583 | HRB98~HRC28 |
Washer dimension GB/T 1230
d | 12 | 16 | 20 | 22 | 24 | 27 | 30 |
d1 | 13 | 17 | 21 | 23 | 25 | 28 | 31 |
d2 | 25 | 33 | 40 | 42 | 47 | 52 | 56 |
h | 3 | 4 | 4 | 5 | 5 | 5 | 5 |
High Strength Connection Accessories Construction Axial Force
D | M16 | M20 | M22 | M24 | M27 | M30 |
8.8S KN | 75 | 120 | 150 | 170 | 225 | 275 |
10.9S KN | 110 | 170 | 210 | 250 | 320 | 390 |
Mechanical property
σb N/mm² | σ0.2 N/mm² | δ5 % | Ψ % | ak J/cm² | K Conefficient of forgue | |
̅k | σn~1 | |||||
1040~1240 | ≥940 | ≥10 | ≥42 | ≥59 | 0.110~0.150 | ≤0.01 |
Calculation method of bolt length
d | 12 | 16 | 20 | 22 | 24 | 27 | 30 |
L1 | 25 | 30 | 35 | 40 | 45 | 50 | 55 |
L（Bolt length）=Connecting plate thickness+L1
L1=nut thickness+2×washer thickness+(2~3)thred pitch
