National Standard for Forging Rigging and Rigging Slings
a) lifting hook
1, the type of hook
The hook has two forms: single hook and double hook.
(1) Single hook: It is a commonly used hook. It is simple in structure and convenient to use. The material is generally made
of 20# high quality carbon steel or 20Mn, and the maximum lifting capacity is no more than 80 tons.
(2) Double hooks: When the lifting weight is large, double hooks are used, and the force is evenly symmetrical. The material
is generally forged from 20# high-quality carbon steel or 20Mn, and the lifting equipment of more than 80 tons is usually
The laminated hook is riveted by cutting and forming a plurality of steel plates. Since the hook plates are not broken at
the same time, the working reliability is better than that of the integrally forged hooks, and the disadvantage is that the
weight and the size are large.
2. The scrapping standard of the hook
(1) The hook has cracks,
(2) the dangerous section wears up to 10% of the original size,
(3) the opening degree increases by 15% compared with the original size,
(4) the torsional deformation exceeds 10 degrees,
(5) the dangerous section or the hook Plastic deformation of the neck
Note: Cracks or wear on the hooks cannot be repaired.
2) Common end fittings for rigging components
Shackles, lifting rings, eye hooks, rope cards, clamps, etc. are the main end fittings that constitute the slings and
spreaders. The correct use is directly related to the safety of the spreaders and rigging.
Accessories requirements: must be manufactured by a professional manufacturer in accordance with the corresponding standards.
Rated load in technical parameters
According to the specified safety factor is not less than 4
3, end hook as rigging comnopents:
There are many types of end hooks, and different types of end hooks can be selected to form spreaders and slings for
different purposes. Commonly used are: clevis hook, eye hook, swivel hook, S hook, etc.,
The usage must follow working load and breaking load.
PINTEJIN Rigging lifting sling now has become leading enterprise in China. And we are creating the largest-scale and metal forging workshop.PINTEJIN has the complete production line from raw material to finished products. Each processing has independent workshop, making lifting sling, ratchet strap, car towing belt from 0.5T to 3000T. We are capable of finishing big order quickly.