- Standard: APi Spec 8c、BB/T19190
- Adopts high-quality structural alloy steel as raw material
- Safety Factor: n=2.25 ～3
- Working Load Limit: 50 ～750 tons
- Both ends are shaped by die forging process, the pole is pulled by free forging.
- Special heat treatment.
- Non-destructive test is performed.
- Its strength is verified throughout 1.5 WLL tensile test
- There are signs such as WORKING LOAD LIMIT marked on the link.
- Surface painted.
- It is applicable for drilling in deep well and super-deep well.
- Use in couple.
Description
