Mounting bolts generally refer to ordinary bolts, which can be disassembled and reused.

高強螺栓泛指級別強度在8.8級以上的螺栓，分為8.8；9.8；10.9；10.9S(鋼結構專用大六角頭螺栓);12.9。高強螺栓在使用時根據(jù)螺栓的扭力系數(shù)計算出螺栓的施擰系數(shù)，釋放螺栓的張力，即完成螺栓終擰，不可重復使用。

High strength bolts generally refer to bolts with strength above grade 8.8, which are divided into 8.8; 9.8； 10.9； 10.9s (special large hexagon head bolt for steel structure); 12.9。 When the high-strength bolt is used, the tightening coefficient of the bolt is calculated according to the torque coefficient of the bolt, and the maximum tension of the bolt is released, that is, the final tightening of the bolt is completed, which can not be reused.

1.普通螺栓一般用普通碳素結構鋼制造,不經熱處理,高強螺栓一般用碳素結構鋼或合金結構鋼制造,需要經過調質熱處理提高綜合機械性能。 高強度分為,8.8級,10.9級,12.9級。

1. Ordinary bolts are generally made of ordinary carbon structural steel without heat treatment. High strength bolts are generally made of high-quality carbon structural steel or alloy structural steel, which needs quenching and tempering heat treatment to improve comprehensive mechanical properties. High strength is divided into grade 8.8, grade 10.9 and grade 12.9.

2.從強度等級: 高強螺栓常用8.8S和10.9S兩個強度等級。 普通螺栓一般有4.4級,4.8級 5.6級8.8級。

2. Strength grade: high strength bolts usually have two strength grades: 8.8s and 10.9s. Ordinary bolts generally have grade 4.4, grade 4.8, grade 5.6 and grade 8.8.

3.從受力特點高強螺栓施加預拉力和靠摩擦力傳遞外力,普通螺栓靠栓桿抗剪力和孔壁承壓來傳遞剪力。

3. From the stress characteristics, high-strength bolts apply pretension and transmit external force by friction, while ordinary bolts transmit shear by bolt rod shear resistance and hole wall pressure.