Couplings are used to hold the neighboring joints together during axial tension or compression.The common oilfield API-5CT casing couplings include J55, K55, N80 and P110 in accordance with API 5CT/5B, can be classified as STC (short thread), LTC (long thread) BTC (buttress thread) and premium connections.
Coupling Stock Cutting
Coupling shot blasting
Coupling CNC Threading
Coupling Phosphating line
Coupling Fluorescent magnetic particle testing
Coupling Coating and Color painting
Coupling Marking
Coupling Packaging
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Processing（traditional）:
Raw material Feeding----Sawing----Turning (peeling) ----Steel Stamping ----Turning end face, boring, Threading (CNC)----Thread inspection----Magnetic particle testing-----Phosphating----Painting----Drying----Color ring spraying ----Packaging----Warehousing
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