What are the specifications of m8 screws?

What are the specifications of m8 screws? Introduction of various M8 screw specifications

Relatively speaking, the diameter of m8 screw is relatively certain, which is 8mm. This is also the name of m8 screw. The key point is that the length of m8 screw will have a certain difference, so the specification of m8 screw is not a definite value. The following is a detailed introduction to the specifications of m8 screws and the complete set of various M8 screw sizes.

What is the m8 screw specification

The major diameter of the M8 screw is 8 mm, the middle diameter is 7.188 mm, and the minor diameter is 6.647 mm. (What is the meaning of the major diameter of the screw thread, the middle diameter and the minor diameter)

Generally speaking, there are: m8*20, m8*25, m8*30, m8*35, m8*40, m8*45, m8*50, m8*55 and so on.

M8 hexagon socket bolt size calculation method:

1. Head size (unit: mm)

(1) Diameter φD=13

(2) Height K=8

2. Hexagon socket size s (unit: mm): 6
3. Nominal length (in mm): 12-80

Commonly used standards are: GB52, GB6170, GB6172 and DIN934.

The main difference between them is: the thickness of GB6170 is thicker than that of GB52, GB6172 and DIN934, commonly known as thick screw.

The other is the difference between the opposite sides. In the M8 nut series, the opposite sides of DIN934, GB6170 and GB6172 are all 13MM which is 1MM smaller than the 14MM of GB52.

The opposite side of DIN934 and GB52 of M10 nut is 17MM, which is 1MM larger than the opposite side of GB6170 and GB6172. For M12 nut, the opposite side of DIN934 and GB52 is 19MM, which is 1MM larger than the opposite side of GB6170 and GB6172.

For the M14 nut, the opposite side of DIN934 and GB52 is 22MM, which is 1MM larger than the opposite side 21MM of GB6170 and GB6172. The other is the M22 nut. The opposite side of DIN934 and GB52 is 32MM, which is better than GB6170 and GB6172.