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Yellow Zinc Plated,Round Domed Head Square Neck Carriage Bolt DIN603,M 6 /8 /10 /12 /16
Diameter range (mm)：M5-M24，3/16-1'Length range (mm)：16-600，1''-2'
In terms of inner hexagon, there are two versions of the national standard, one is GB70-76, the 76 year version, and the other is GB70-8585 version, our company is now implementing the DIN912 standard, so we should pay attention to the difference in actual business operations: GB70 -85 completely coincides with DIN912, so there is no difference in the use of the new standard, mainly the difference between GB70-76 and DIN912: for M8 series hexagonal products, the diameter of the round head of GB70-76 is 12.5MM, It is smaller than 13.27MM of DIN912. For M10 series inner hexagon products, the round head diameter of GB70-76 is 15MM, which is smaller than 16.27 of DIN912. For M12 series inner hexagon, the round head diameter of GB70-76 is 18MM. It is smaller than the opposite side 18.27 of DIN912, and the round head diameter of the inner hexagon GB70-76 of the M16 and M20 series is 0.33MM smaller than that of DIN912, which are 24MM and 30MM respectively. DIN912 is 24.33MM and 30.33MM respectively. In addition, the width of the inner hexagon between the old standard and the German standard is different due to different standards. The inner side of GB70-76 is smaller, and it should be paid attention to in business operations.
In addition, there are also some differences in the carriage screws that may be used at ordinary times. I will also make an explanation here. In the national standard, there are two standards for carriage screws, namely GB12 (small semicircular head square neck screw) and GB14 (large semicircular head square neck screw) Neck screws), and the German standard DIN603 is usually more commonly used in the market. Now to distinguish these three: for the round head and neck, when comparing the same specifications: GB12<GB14<DIN603<SPAN>. Usually when the carriage screw is used, the head and neck are often required to be large and thick, so the standard of DIN603 carriage screw fully meets the requirements
