Standard: API 5CT & 5B Steel Grade: H40,J55, K55, N80, R95,L80, C90, T95, P110, Q125 Dimension: Tubing coupling from 2-3/8 to 4-1/2, Casing coupling from 4-1/2 to 20 End finish: NUE, EUE (tubing coupling); STC, LTC, BTC (casing coupling) Colors: J55/ K55-Bright Green,P110-White, N80/ L80-Red etc PACKING: by wooden cases, wooden pallet, or as per customer request As required by API 5CT standard, the couplings are always given color layer in order to differ the steel grade. J55-Green, N80-Red P110-White C75-Blue C-90-Brown
