扭剪型高强螺栓和大六角型高强螺栓的区别是什么？首先了解一下它们的定义：
What is the difference between torsional shear high strength bolt and large hexagon high strength bolt? Let's first understand their definitions:
大六角（Hex head ），英文简称为HSFG（High strength friction grid bolts）。顾名思义，大六角头螺栓的螺帽是正六角形的，可以推断出这是便于使用扳手固定的需要，这是更初使用的高强螺栓的类型。
Hex head ）， It is called hsfg (high strength friction grid bolts) for short in English. As the name suggests, the nut of large hexagon head bolt is regular hexagon, which can be inferred to be convenient for fixing with wrench. This is the type of high-strength bolt originally used.
扭剪型（troque shear style /Twist off bolts/），英文一般简称TCB（Tension control bolts）以示区别。其端部端部有梅花卡头（spline-end），并且螺栓的螺帽一般是圆形（不需要使用扳手固定）；是日本人在HSFG的基础上开发研制的改进型产品。
Torque shear style / twist off bolts /, commonly referred to as TCB (tension control bolts) in English to show the difference. Its end has a spline end, and the nut of the bolt is generally round (it does not need to be fixed with a wrench); it is an improved product developed by the Japanese on the basis of hsfg.
扭剪型和六角螺帽型高强螺栓的区别：
Differences between torsion shear type and hexagon nut type high strength bolts:
1.扭剪型高强螺栓的头部有一梅花头，而大六角的没有。
1. The head of torsional shear high-strength bolt has a plum blossom head, while the large hexagon bolt does not.
2.扭剪型高强螺栓的尾部是圆的，而大六角的没有。
2. The tail of torsional shear high-strength bolt is round, while the large hexagon bolt does not.
3.在施工方法上所使用的工具不同：扭剪型高强螺栓使用电动工具，而大六角使用的扭矩扳头。
3. Different tools are used in construction methods: electric tools are used for torsional shear high-strength bolts, while torque wrenches are used for large hexagon.
4.确认螺栓是否已达到预紧力的方法不同：在施工中，对于扭剪型高强螺栓，只要梅花头掉落，即可认为合格，而大六角则需要调节扭矩扳手的扭矩来确认。
4. There are different methods to confirm whether the bolt has reached the pre tightening force: during construction, as long as the plum blossom head falls, it can be considered as qualified, while the large hexagon needs to be confirmed by adjusting the torque of the torque wrench.
其实，在外观上大六角和普通螺栓是一样的，这种螺栓现在一般很少用，因为施工起来很不方便，而且容易发生漏拧的情况，难以确认螺栓是否已经达到设计要求的预紧
In fact, the appearance of the large hexagon bolt is the same as that of the ordinary bolt. This kind of bolt is generally rarely used now, because it is very inconvenient to construct, and it is easy to miss tightening, so it is difficult to confirm whether the bolt has met the pre tightening requirements of the design
