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

高强螺栓泛指级别强度在8.8级以上的螺栓，分为8.8；9.8；10.9；10.9S(钢结构专用大六角头螺栓);12.9。高强螺栓在使用时根据螺栓的扭力系数计算出螺栓的施拧系数，释放螺栓的张力，即完成螺栓终拧，不可重复使用。

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结构钢制造,不经热处理,高强螺栓一般用碳素结构钢或合金结构钢制造,需要经过调质热处理提高综合机械性能。 高强度分为,8.8级,10.9级,12.9级。

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.从强度等级: 高强螺栓常用8.8S和10.9S两个强度等级。 普通螺栓一般有4.4级,4.8级 5.6级8.8级。

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.从受力特点高强螺栓施加预拉力和靠摩擦力传递外力,普通螺栓靠栓杆抗剪力和孔壁承压来传递剪力。

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.