Function of Self Tapping Screws II - Bebon Industry & Trade Co., Limited

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Function of Self Tapping Screws II

Scoring test (Drive Tese): scored test for the main characteristics of Self Tapping Screws, Self Tapping Screws can not be scored when the combination of iron in and it will lose its primary function. So all the specifications required to be scored in Test . B18.6.4 provides end-type AB, B, BP, C, D, F, G and T (BF, BT, BG excluded) subject to assembly and testing.

In the test, the Self Tapping Screws must be in accordance with the provisions of the hardness of a precession thickness and pre-drilled holes in the plate, no need to spin into the visual when the thread deformation, no torque limitation in the test. The triangular teeth of the Self Tapping Screws (see SAEJ78, J1237, FIP 1000, DIN 7500) in assembly tests, requires not only the precession of the time thread to be no visual distortion, but also provides maximum torque testing at the assembly.

Torque strength test: All dimensions and types of Self Tapping Screws required for the torque test, the test will screw into a blind hole in the fixed device (at least 2 threads), the screw head exposed (at least two threads .) use a calibrated and displayed by less than ± 2% accuracy of the torque device subjected to torque until the screw fracture (usually breaking is located at the junction of the screw shank or neck), the measure of torque at least equal to the specified value or who is more qualified.

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