Casing coupling Casing coupling is for the dimensions more than 4 1/2 inch. Differently than tubing coupling is, casing coupling normally does not need to be thickened (Non-upset), which means no upset casing coupling, so it has following types: Round thread  • LTC/LC: Long round thread casing coupling              • STC/SC: Short round thread casing coupling Buttress thread • BTC/BC: Buttress thread casing coupling

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