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Hex nut standard

As a standard part, it should have its own general specifications for hex nuts. Commonly used standards are: GB52, GB6170, GB6172 and DIN934. The main difference between them is: GB6170 is thicker than GB52, GB6172 and Thick from DIN934, commonly known as thick nuts. The other is the difference on the side, the opposite side of DIN934, GB6170, GB6172 in the M8 nut series is 13MM smaller than the opposite side of GB52 14MM, M10 nut, the opposite side of DIN934 and GB52 is 17MM, The opposite side of GB6170 and GB6172 should be 1MM, the nut of M12, the opposite side of DIN934 and GB52 is 19MM larger than the opposite side of GB6170 and GB6172 18MM. For the M14 nut, the opposite side of DIN934 and GB52 is 22MM larger than the opposite side 21MM of GB6170 and GB6172. In addition, the nut of M22, the opposite side of DIN934 and GB52 is 32MM, which is 2MM smaller than the opposite side of GB6170 and GB6172. (GB6170 and GB6172 have the same width except for their different thicknesses.) The remaining specifications can be used without considering the thickness.

1. Ordinary outer hexagon - widely used, characterized by relatively large fastening force. The disadvantage is that there must be enough operating space during installation. When installing, you can use adjustable wrench, open end wrench or glasses wrench. The above wrenches need to be very large. Operating space.
2, the hexagonal hexagon socket - is the most widely used of all screws, because it has a relatively large fastening force, can be operated with an Allen key, easy to install, almost used in a variety of structures, the appearance is more beautiful and tidy, The disadvantage is that the fastening force is slightly lower than the outer hexagon, and the repeated use of the inner hexagon is easy to damage and cannot be removed.
3, Pan head hexagonal - mechanically seldom used, mechanical properties are the same as above, mostly used in furniture, the main role is to increase the contact surface with wooden materials and increase the ornamental appearance.
4, headless hex - some structures must be used, such as the top wire structure that requires a large top force, or where the cylinder head needs to be hidden.
5, countersunk head hex - mostly used in power machinery, the main role is the same as the inner hexagon. 6. Nylon lock nut - A nylon apron is placed in the hexagonal surface to prevent loose threads and is used on strong power machinery.
7, flange nut - mainly to increase the role of contact with the workpiece, mostly used in pipes, fasteners have been stamped and cast parts.
8, ordinary hex nut - the most versatile, and one of the most common fasteners.


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