1. Coupler raw material are cutting by auto pipe cutting machine all length are strictly controlled by the cutting machine computure, the end of the pipes only take about 1% to 3% which will be cutting by hand cutting machine but will be tested by hand one by one also under the length required tolerance.
2. The couplers will be surface peeling by auto outdiameter peeling machine and chamfered by auto machines, also we will check it each 50pcs per batch. Peeling the surface the cutters may worn out and make the outdiameter larger which is more stronger too, so this peeling surface will not affact the coupler cross section area, we testing just make sure the outdiameter of the coupler are in required tolerance of +-0.5mm.
3. Thread Tapping the couplers will be tested by Thread Go Gauge and Stop Gauge each 50pcs as one batch, The go Gauge tested the coupler larger diameter and make sure the whole gauge should pass the whole coupler length smoothly and the stop gaue is testing the middle diameter of the couplers, the stop gauge should be stopped at the second or third thread of the couplers to make sure the coupler middle diameter is larger enought to grantee the coupler connecting strength.
4.After threading we will need to put the couplers in a dry place to make it dry and clean and then will packing it by bags and pallets to be ready to send to Client.
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