1. Raw Material Preparation: Select qualified brass/stainless steel/carbon steel, cut to standard blanks, clean surface impurities, and conduct incoming inspection (composition, hardness, dimension).
2. Blank Forming: Form straight coupling blanks by cold extrusion/hot forging, remove flash, and perform stress relief annealing to ensure straightness and avoid deformation.
3. Precision CNC Machining: Finish machine coupling body (outer hexagon, inner bore, sealing seat), process standard male threads (NPT/BSP), deburr and chamfer to ensure precision.
4. Matching Parts Processing: Machine compression nuts and ferrules, control fit clearance and dimensional accuracy to ensure smooth assembly and reliable sealing.
5. Assembly & Preliminary Inspection: Assemble nuts and ferrules in order, check assembly smoothness and thread fit, and screen unqualified semi-finished products.
6. Surface Anti-corrosion Treatment: Conduct nickel plating/passivation/anti-rust coating to improve corrosion resistance, avoiding peeling and color difference.
7. Finished Inspection: Inspect thread accuracy, dimension, sealing performance, and conduct pressure test for key products; reject unqualified products.
8. Packaging & Warehousing: Package with anti-scratch materials, mark specifications clearly, and store in a dry, ventilated environment.