Sanheng implement complete TQC to ensure quality.

 Approve technical production drawing.

 Test machine programming.

 Check raw materials to ensure no rust.

 Document every process in the ERP system for tracking.
 Check product dimensions with thread gauge, caliper, micrometer and other tools anytime.
 100% inspection before surface treatment and trimmed burrs to ensure smooth.
 Perform random salt spray test on the product after the surface treatment is completed.

 Check fittings with tools and test machines, such as thread gauges.

 Check the appearance of the fittings before packaging again.