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Hooks are usually equipped with safety latches to prevent the disengagement of lifting wire rope sling or chain ;
Hooks can be classified into single hook and double hooks according to the appearance;
Hook Grades:
> M grade with DG20, or DG20Mn
> P grade with DG20Mn
> S grade with DG34CrMo
> T grade below 40t with DG34CrMo, more than 40t with DG34CrNiMo or DG30Cr2Ni2Mo
> V grade below 40t with DG34CrNiMo or DG30Cr2Ni2Mo, more than 40t with DG30Cr2Ni2Mo.
One of the following cases happens, and discard as useless.
1.Flaws
2.Abrasion of dangerous fracture surface reaches 10% of full size.
3.The degree of opening adds to 15% than the full size.
4.Torsional deformation exceeds 10°.
5.Dangerous fracture surface and hook neck have plastic deformation.
6.The lining of board hook abrades reaches 50% of full size and should be discarded as useless.
7.The mandrel of board hook abrades reaches 50% of full size and should be discarded as useless














A: Yes, we are professional manufacturer of boiler and pressure vessels in Henan, China.
Q: Do you have any Certificate?
A: Yes. Our boiler have got China GB ISO certificates and CE certificate of EU. We also can provide ASME, GHOST and other necessary certificates if you need.
Q: How can I pay you?
A: T/T, Western Union, Money Gram and Ali Trade Assurance is better.
Q. What about installation?
A: We provide 1 or 2 technicians overseas services for installation, debugging and training.
Q: How can you ensure the quality?
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