How to choose a lifting hook? Key considerations for selecting hooks of different capacities.
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Time：
2026-07-13
Lifting hooks are critical safety components in hoisting operations; selecting the wrong capacity or mismatching the model can easily lead to serious accidents such as overloading and slippage, or hook‑body fracture. Many companies, when making purchases, rely solely on the static weight of the load while neglecting key factors like dynamic loads, lifting angles, and operating conditions, thereby creating long-term safety hazards.
As a professional lifting‑attachment service provider, NOB has long been dedicated to the R&D and supply of forged hooks, swivel hooks, and heavy‑duty hooks. Drawing on both the Chinese national standard GB/T 10051 and the European standard EN 13889, we have developed a comprehensive selection methodology and product‑matching solutions, enabling factories, infrastructure projects, wind‑energy facilities, and port operators to precisely match hooks that balance operational safety with extended service life.
Step 1: Accurately calculate the required rated tonnage (the core selection criterion).
The rated capacity marked on the hook refers to the Working Load Limit (WLL). It is strictly prohibited to select a hook based solely on the net weight of the load; a safety factor must be applied to provide an adequate margin of safety.
1. Basic tonnage calculation formula: Actual equivalent load = Weight of the load + Weight of lifting gear / tooling × Dynamic load factor (1.1–1.3) + Additional weight due to lifting angle coefficient.
Industry‑wide safety standards: For routine indoor static lifting, the safety factor shall be ≥4; for outdoor use, impact loads, and frequent heavy‑load operations, the safety factor shall be ≥5.
2. Tonnage Matching Reference Table (NOB Product Compatibility)
Key Considerations for Avoiding Pitfalls in Tonnage Selection
When the angle between the two chains and the two slings exceeds 90°, the load on the single hook increases significantly; the rated capacity must be upgraded by one level.
Frequent lifting, rapid hoisting and lowering, and exposure to strong outdoor winds require upgrading the rated capacity by one level; cast hooks are prohibited.
All NOB hook models are forged as a single piece from alloy steel, with no welds, and offer impact resistance far superior to cast‑iron counterparts.
Step 2: Match the NOB hook type to the application scenario. (Tonnage‑based selection) For the same lifting capacity, different hook designs are suited to entirely distinct application scenarios. When selecting a hook, it is essential to ensure compatibility with the connection method, rotational requirements, and anti‑detachment safety features.
Eye-type slip hook (standard capacities from 1T to 15T)
Structure: One-piece forged hook body with a spring‑loaded anti‑detachment latch; the hanging loop is integrally formed.
Compatibility: Compatible with chain rigging and suitable for simple fixed lifting; universally applicable in small- and medium‑tonnage workshops.
NOB Grade 80 eye hooks are quenched and tempered, offering excellent wear resistance and deformation resistance.
Selection tip: 3T and 5T are the standard in-stock specifications, ideal for low‑frequency, steady‑state lifting operations.
Rotating hook with bearing (popular capacity range: 3–50 tons)
Structure: Built-in sealed bearings, 360° free rotation to eliminate rope twists, and a built-in thickened anti‑slip buckle.
Applications: mold handling, wind power, and equipment overturning and lifting—requiring multi‑angle positioning; this is NOB’s flagship safety‑focused model.
Tonnage options: 10 t, 16 t, 25 t. The rotary hook is compatible with most medium-sized heavy‑industry enterprises, reducing the risk of side‑pull damage.
Step 3: Select the appropriate material, manufacturing process, and operating conditions to ensure compatibility. Once the tonnage is determined, the operating environment dictates the service life of the hook. NOB offers two surface‑treatment processes tailored to different application scenarios:
For indoor, dry‑environment factories (machine tool and mold workshops), we recommend powder‑coated, corrosion‑resistant suspension hooks made from standard Grade 80 alloy steel. We stock the full range of capacities, from 1 ton to 50 tons, offering excellent value for money.
For outdoor, port, and chemical‑industrial environments with high humidity and corrosive conditions, select hot‑dip galvanized heavy‑duty hooks to enhance rust resistance and corrosion protection. For capacities of 10 tons and above, the galvanizing process is recommended.
In high-temperature metallurgy and forging workshops, NOB’s specialized quench‑and‑temper lifting hooks are designed with an optimized heat‑treatment process, ensuring they resist softening and deformation even in extreme temperatures. S‑grade, high‑strength models are the preferred choice.
General Safety Guidelines for Hook Selection and Use
If the hook body’s rated capacity marking is illegible, wear exceeds 10%, the opening is deformed, or cracks are present, the hook shall be scrapped immediately, regardless of its rated capacity, and welding repairs for reuse are prohibited.
The sling must be attached to the load‑bearing center at the bottom of the hook; it is prohibited to attach it to the hook tip or to use it with a single side pull.
When lifting with multiple slings, keep the angle between them within 90°; the larger the angle, the higher‑capacity hook should be selected.
Before putting a new hook into service, it must be test‑lifted at 1.5 times its rated capacity to confirm that there is no deformation before commencing regular operations.
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