• Designed factor is 2.25-3.
• Adopted high-quality alloy steel and throughout swaged forging
• Designed factor is 2.25-3.
• WORKING LOAD LIMIT: 75~500 ton..
• Both the ends are shape by swaged forging process, the pole is pulled by open forging
• Special Heated Treated.
• It is applicable for drilling operation for deep well and super-deep well.
• Every link test by 1.5 rate work load before deliver.