Note: P – plain end; S – short round thread; L – long round thread; B – buttress thread; C – oil casing with Baosteel premium connection; X – Baosteel extreme-line casing.
a. Label are for information and assistance in ordering.
b. Nominal linear masses, threaded and coupled are shown for information only.
c. The densities of martensitic chromium steels (L80 types 9Cr and 13 Cr) are different from carbon steels. The masses shown are therefore not accurate for matensitic chromium steels. A mass correction factor of 0.989 may be used.
1. Standard Coupling
2. Special Clearance Coupling
3. Special Bevel Coupling
4. API Modified Seal-Ring Coupling(SR 13)
5. Combination Coupling or Reducing Coupling