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- Oct 31, 2018 -

also called pumping hole, hole, is in a small hole on the smoke into a larger hole, tapping again, mainly with the thickness of thin sheet metal processing, increase the strength and the screw thread turns, avoid sliding tooth, commonly used in thickness is thin, its around the normal shallow flanging, basic did not change, the thickness of thin thickness is allowed in the 30-40%, larger than normal flanging height can be obtained high height of 40-60%, with crowded thin 50% when, can get the biggest flanging height, when the thickness is bigger, such as the thickness of above the 2.0, 2.5, etc, can be directly tapping.