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