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High strength bolts are made of high strength materials. The screw, nut and washer of the high-strength bolt are made of high-strength steel.
High strength bolts transmit external forces by applying pretension and friction.
High strength bolts are generally used for permanent connections.
High-strength bolt connection has the advantages of simple construction, good mechanical performance, disassembly, fatigue resistance, and no loosening under dynamic load, so it is a promising connection method.
| Class 8.8 high strength bolt construction torque value reference table | ||||||||
| S.Q | Bolt specification | Bolt performance class | Standard value of construction pre-tension (KN) | Torque coefficient (standard deviation less than or equal to 0.010) | Initial torque (N*m) | Final torque (N*m) | Measured torque coefficient | Final torque (N*m) |
| 1 | M16 | 8.8s | 75 | 0.11~0.15 | 78 | 132~180 | 0.121 | 145 |
| 2 | M20 | 8.8s | 120 | 0.11~0.15 | 156 | 264~360 | 0.123 | 295 |
| 3 | M22 | 8.8s | 150 | 0.11~0.15 | 215 | 363~495 | 0.125 | 413 |
| 4 | M24 | 8.8s | 170 | 0.11~0.15 | 265 | 448.8~612 | 0.125 | 510 |
| 5 | M27 | 8.8s | 225 | 0.11~0.15 | 395 | 668.3~911.3 | 0.125 | 759 |
| 6 | M30 | 8.8s | 275 | 0.11~0.15 | 536 | 907.5~1237.5 | 0.125 | 1031 |
| Class 10.9 high strength bolt construction torque value reference table | ||||||||
| S.Q | Bolt specification | Bolt performance class | Standard value of construction pre-tension (KN) | Torque coefficient (standard deviation less than or equal to 0.010) | Initial torque (N*m) | Final torque (N*m) | Measured torque coefficient | Final torque (N*m) |
| 1 | M16 | 10.9s | 110 | 0.11~0.15 | 114 | 193.6~264 | 0.122 | 215 |
| 2 | M20 | 10.9s | 170 | 0.11~0.15 | 221 | 374~510 | 0.12 | 408 |
| 3 | M22 | 10.9s | 210 | 0.11~0.15 | 300 | 508.2~693 | 0.126 | 582 |
| 4 | M24 | 10.9s | 250 | 0.11~0.15 | 390 | 660~900 | 0.125 | 750 |
| 5 | M27 | 10.9s | 320 | 0.11~0.15 | 562 | 950.4~1296 | 0.125 | 1080 |
| 6 | M30 | 10.9s | 390 | 0.11~0.15 | 761 | 1287~1755 | 0.125 | 1463 |
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