1. Turning Force Test: The torsional force of a product is to demonstrate its ability to resist being twisted in half. Various standards have stipulated minimum requirements for self-tapping nail torque. In this test, the dowels are clamped on a torsion tester with a tapped splitter in the middle of the tap, and then the torque wrench is used until the dowels break. If the torque does not exceed the minimum required, the test product fails. Unqualified shows that the way in which the nail is too soft or ridged is too small.
2. Locking test: This test is to lock the nails to a test board with the specified hardness, thickness and hole diameter. If the nail is locked through the test plate but the ridges are deformed, the product will fail. Unqualified shows that the surface hardening of the nail is too light or too soft.
3. Locking Torsion Test: This test is only required for screws that have been screwed. When the lock test was performed, the minimum locking torque of the test board was observed. If the torque exceeds the specified standard value (the standard value is based on the size of the nail\surface treatment), this product is not qualified. Failed to show that the surface of the nail is not sufficiently lubricated, or that the ribs are not properly formed and require more torque.