Standard Specification for Carriage Bolts

Today I will introduce to you several standard specifications commonly used in carriage bolts

In terms of hexagon sockets, there are two versions in the national standard, one is GB70-76, the 76 version, and the other is GB70-8585 version. Our company now implements the DIN912 standard, so we should pay attention to the difference in actual business operations: GB70-85 and DIN912 completely overlap, so there is no difference when using the new standard. The main difference is the difference between GB70-76 and DIN912: M8 series of hexagon socket products, GB70-76 has a round head diameter of 12.5 MM. It is smaller than the 13.27MM of DIN912. For the M10 series of hexagonal products, the diameter of the round head of GB70-76 is 15MM, which is smaller than the 16.27 of DIN912. The diameter of the round head of GB70-76 is 18MM. The opposite side of DIN912 is smaller than 18.27. Another example is that the round head diameter of the inner six GB70-76 of the M16 and M20 series is 0.33MM smaller than that of DIN912, respectively. 24MM and 30MM. DIN912 is 24.33MM and 30.33MM respectively.

In addition, the inner opposite side width between the old standard and the German standard inner hexagon is different due to different standards. The inner side opposite of GB70-76 is smaller, which should also be paid attention to in business operations. In addition, there are some differences in carriage screws that may be used in ordinary times. Here is also an explanation. In the national standard, there are two standards for carriage screws, namely GB12 (small half round head square neck screws) and GB14 (large half round head square neck screws). Neck screws), and the German standard DIN603 is commonly used in the market. Now make a distinction between these three: For round head and neck, when the same specification is compared, it is: GB12<><>< span=""> o Usually when the carriage screw is used, the head and neck are often required to be large and thick. , So the DIN603 carriage screw standard fully meets the requirements.

The products of Qingdao Haorui Steel Products Co., Ltd. mainly include: furniture screws, rigging pins, automobile screws, hollow rivets, semi-hollow rivets, pins, flat washers, nuts and other non-standard fasteners of various specifications and materials, and Customize various special-shaped fasteners, and process and produce standard parts with various specifications of raw materials, cold drawn wires, and straightening and blanking.