Classification of high strength bolts: grade 8.8, 9.8, 10.9 and 12.9. High strength bolts are mainly used in steel structure engineering. The construction of high-strength bolts requires initial tightening before final tightening. High strength bolt is a high strength bolt, which belongs to a standard part. The shape and connection structure of high-strength bolts are basically the same as those of ordinary bolts.

有四個等級。有8.8級,9.8級,10.9級,12.9級。

There are four levels. There are 8.8, 9.8, 10.9 and 12.9 levels.

高強(qiáng)螺栓，使用日益廣泛。常用8.8和10.9兩個強(qiáng)度等級，其中10.9級居多。普通螺栓強(qiáng)度等級要低，一般為4.4級、4.8級、5.6級。

High strength bolts are increasingly used. Two strength grades, 8.8 and 10.9, are commonly used, of which 10.9 is the majority. The strength grade of ordinary bolts shall be low, generally 4.4, 4.8 and 5.6.

高強(qiáng)螺栓主要應(yīng)用在鋼結(jié)構(gòu)工程上。高強(qiáng)螺栓的一個非常重要的特點(diǎn)就是限單次使用，一般用于長時間連接，嚴(yán)禁重復(fù)使用。

High strength bolts are mainly used in steel structure engineering. A very important feature of high-strength bolts is that they are limited to single use. They are generally used for long-term connection and are strictly prohibited from repeated use.

高強(qiáng)螺栓的施工需要先初擰后終擰，初擰高強(qiáng)螺栓需用沖擊型電動扳手或扭矩可調(diào)電動扳手；而終擰高強(qiáng)螺栓有嚴(yán)格的要求，終擰扭剪型高強(qiáng)螺栓需要用扭剪型電動扳手，終擰扭矩型高強(qiáng)螺栓?用扭矩型電動扳手。

The construction of high-strength bolts requires initial tightening before final tightening, and the initial tightening of high-strength bolts requires impact electric wrench or torque adjustable electric wrench; The final tightening of high-strength bolts has strict requirements. The final tightening of torsional shear high-strength bolts requires a torsional shear electric wrench, and the final tightening of torque high-strength bolts requires a torque electric wrench.

高強(qiáng)螺栓就是高強(qiáng)度的螺栓，屬于一種標(biāo)準(zhǔn)件。一般情況下，高強(qiáng)度螺栓可承受的載荷比同規(guī)格的普通螺栓要大。

High strength bolt is a high strength bolt, which belongs to a standard part. Generally, the load that high-strength bolts can bear is larger than that of ordinary bolts of the same specification.

高強(qiáng)螺栓的形狀、連接構(gòu)造與普通螺栓基本相同，兩者的主要區(qū)別是：普通螺栓連接依靠桿身承壓和抗剪來傳遞剪力，在扭緊螺帽時螺栓產(chǎn)生的預(yù)拉力很小，其影響不予考慮；高強(qiáng)螺栓連接的工作原理是有意給螺栓施加很大的預(yù)拉力，使被連接件接觸面之間產(chǎn)生擠壓力，因而垂直于螺桿方向有很大摩擦力，依靠這種摩擦力來傳遞連接剪力。高強(qiáng)螺栓的預(yù)拉力是通過扭緊螺帽實(shí)現(xiàn)的，普通高強(qiáng)螺栓一般采用扭矩法、轉(zhuǎn)角法。扭剪型高強(qiáng)螺栓則采用扭斷螺栓尾部以控制預(yù)拉力。

The shape and connection structure of high-strength bolts are basically the same as those of ordinary bolts. The main differences between the two are: ordinary bolt connections rely on the pressure bearing and shear resistance of the rod body to transmit the shear force, and the pretension produced by the bolts when tightening the nuts is very small, and its impact will not be considered; The working principle of high-strength bolt connection is to deliberately exert a great pre tension on the bolt, so that there is a squeeze force between the contact surfaces of the connected parts. Therefore, there is a great friction force perpendicular to the screw direction, and the connection shear force is transmitted by this friction force. The pretension of high-strength bolts is achieved by tightening the nut. The torque method and angle method are generally used for ordinary high-strength bolts. Torsional shear type high-strength bolt adopts twisting the bolt tail to control the pretension.

高強(qiáng)螺栓連接的螺栓采用10．9S級或8．8S級高質(zhì)量合金結(jié)構(gòu)鋼并經(jīng)過熱處理制作而成，高強(qiáng)度螺栓孔應(yīng)采用鉆成孔。摩擦型連接的高強(qiáng)度螺栓的孔徑比螺栓公稱直徑d大1．5～2．0mm；承壓型連接的高強(qiáng)度螺栓的孔徑比螺栓公稱直徑d大1．0～1．5mm。

The bolts connected by high-strength bolts are made of 10.9s or 8.8s high-quality alloy structural steel through heat treatment, and the high-strength bolt holes shall be drilled. The hole diameter of the high-strength bolt for friction type connection is 1.5 ~ 2.0mm larger than the nominal diameter D of the bolt; The hole diameter of the high-strength bolt for pressure bearing connection is 1.0 ~ 1.5mm larger than the nominal diameter D of the bolt.

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