タイトルまたは説明

J*5 / K**-Bright Green
P***-White 
N*0 / L**-Red
For the same colored couplings, we can tell the steel grade according to the color of the belt. 
Descriptions: 
1 Standard: API 5CT/ 5B
2 Steel Grade: H*0、J*5、K*5、N***1、N*0Q、L*0、P**0
3 Tubing Coupling: 
OD: **3/8, **7/8, **1/2, 4, **1/2
Threads: NUE*-Non Upset 
        EUE**-External Upset
4 Casing Coupling:
OD: **1/2, 5, **1/2, **5/8, 7, **5/8, **5/8, **5/8, ***3/4, ***3/4, ***3/8, *6, ***5/8, *0
Threads: STC, LTC, BTC