Strength grade of stainless steel bolt type of sta

2022-07-22
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Stainless steel bolt is one of the common decoration fixing materials in decoration. It has a large amount and a wide range of applications, so friends who are preparing to decorate must have a deep understanding of it. So, how to divide the strength grade of stainless steel bolts? What are the types of stainless steel bolts? Let's take a look at the strength grade of stainless steel bolts

stainless steel bolts are one of the common decoration fixing materials in decoration. It has a large amount and a wide range of applications, so friends who are preparing to decorate must have a deep understanding of it. So, how to divide the strength grade of stainless steel bolts? What are the types of stainless steel bolts? Let's take a look at the strength grade of stainless steel bolts

I. strength grade of stainless steel bolt

1. What is stainless steel bolt

stainless steel bolt is a kind of bolt with very high resistance, which can resist the corrosion of acid and alkali salt. Moreover, due to the different basic components, the resistance of the car is also different, so there are also rust resistance, but it can not resist acid. In our life, the stainless steel bolts used are from austenitic stainless steel, which can be divided into Austenitic 304, 316 and other models

2, strength grade

① the performance grade of common stainless steel bolts is 8.8, which refers to the tensile strength of 800MPa and the yield strength of 640mpa. Stainless steel bolts can be divided into 10 grades from bolt to stud, from 3.6 to 12.9. This decimal point does not represent the decimal point in mathematics. The left of the decimal point represents the strength limit of the material, while the right of the decimal point represents the ratio of yield limit to tensile limit

② the nut also has seven grades, from 4 to 12. The larger the number, the minimum stress that the nut can bear

③ according to the bolt pattern, the external thread can be divided into 1a, 2a and 3a, and the internal thread can be divided into 1b, 2b and 3b. The higher the number, the higher the level and the tighter the coordination

1a, 1b: the grade whose tightness needs to be improved is only applicable to the tolerance fit of internal and external threads

2a, 2B: adopt British series fasteners, the most commonly used thread tolerance grade

3a, 3b: This grade is the most tightly screwed and is mainly used in some safety critical designs

④ thread grade, including external thread and internal thread. External thread: 4h, 6h and 6G; Internal threads are divided into 5h, 6h and 7h. The fitting of thread is also preferably h/g, h/h or g/h, and the bolt of this combination has strong firmness

3. Types of stainless steel bolts

there are many kinds of stainless steel bolts. Even if there are dozens of kinds, and different specifications, their use purposes are also different. For example: outer hexagon bolt, inner hexagon pointed set screw, half round head inner hexagon screw, cross recessed large flat head self tapping screw, hexagon nut, butterfly nut, etc

article summary: the above is all about the strength grade and types of stainless steel bolts. Don't see don't know, a look startled, a small stainless steel bolt actually has so much cold knowledge. Therefore, when you decorate your new house, you should pay attention to those unimpressive small materials

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