A dependable 20Ton Crane Hook assembly is critical for safe heavy lifting in industrial and port hoisting jobs. This 20ton hook block carries a Safe Working Load (SWL) of 20 tons, designed with M5 working class to handle frequent cyclic lifting operations. It comes fitted with a 16# T grade double shank hook, built to meet strict GB10051.4-10 standards, ideal for overhead cranes, gantry cranes, and deck lifting systems.
Every 20Ton Crane Hook undergoes a mandatory tensile load test at 40 tons, held for a minimum of 5 minutes. After the load test, we inspect carefully to confirm no residual deformation, cracks or material flaws remain. All rotating parts of the hook block are checked to ensure smooth free rotation under load, preventing wire rope twisting during lifting and load positioning.
The hook body is forged from 35CrMo alloy steel. Per GB6067-85 requirements, the hook surface is finished smooth, free of wrinkles, grooves, and surface cracks. To guarantee internal integrity, each hook body receives 100% ultrasonic testing (UT) plus magnetic particle inspection (MT) to catch hidden subsurface and surface defects before shipment.
This 20Ton Crane Hook block is equipped with one pulley, available in two base diameters: Ø560mm or Ø650mm, matched for Ø28mm steel wire rope. The pulley bearing model is NNF5020N2. Pulley shaft, nut, and crossbeam are forged components; the pulley itself is fabricated from Q355B hot rolled plate. The whole hook block weighs approximately 580kg.
For surface protection, the standard finish is black and yellow topcoat with total dry paint film thickness ≥180μm. This coating provides good wear and corrosion resistance for indoor workshops and coastal sites. The working temperature range for this 20ton crane hook is -10°C to 45°C.
Key Features
- Safe Working Load (SWL): 20 Ton
- Longitudinal test load: 40 Ton, load retention ≥5 minutes
- Hook: 16# T grade double shank hook, forged 35CrMo, GB10051.4-10 compliant
- Working class: M5
- Wire rope size: Ø28mm
- Pulley: 1 piece, base diameter Ø560 / Ø650 optional
- Pulley bearing: NNF5020N2
- Pulley material: Q355B hot rolled plate; shaft, nut & crossbeam forged
- Full inspection: 100% UT + MT non-destructive testing on hook body
- Operating temperature: -10°C ~ 45°C
- Paint finish: Black & yellow topcoat, dry film ≥180μm
- Total weight: ~580kg
- Standard safety latch included; custom service available
Application
Our 20Ton Crane Hook suits factory workshops, steel stockyards, port cargo handling, and general construction hoisting. It is a perfect fit for overhead cranes, gantry cranes, and deck cranes. You can order this hook block as a brand-new crane assembly component or as a direct replacement for your worn existing lifting hook. For coastal environments, we can upgrade coating options for extra anti-corrosion performance.
Technical Specification
| Item | Parameter | Item | Parameter |
|---|---|---|---|
| Product Name | 20Ton Crane Hook | Working Class | M5 |
| SWL | 20 Ton | Total Weight | ~580 kg |
| Longitudinal Test Load | 40 Ton | Hook Material | 35CrMo Forged Alloy Steel |
| Wire Rope Diameter | Ø28 mm | Pulley Material | Q355B Hot Rolled Plate; Shaft / Nut / Crossbeam Forged |
| Pulley Base Diameter | Ø560 mm / Ø650 mm (optional) | Inspection | Hook body 100% UT & MT Non-Destructive Testing |
| Pulley Quantity | 1 piece | Operating Temperature | -10°C ~ 45°C |
| Pulley Bearing | NNF5020N2 | Paint Specification | Black & Yellow Topcoat, Dry Film Thickness ≥180μm |
| Hook Type | 16# T Grade Double Shank Hook | Compliance | GB10051.4-10, GB6067-85 |
| Customization | Accept custom marking, coating and dimension adjustments |
FAQ
Q: What does M5 working class mean for this 20Ton Crane Hook?
A: M5 is a moderate cyclic duty rating. This 20 ton crane hook is engineered for regular daily lifting cycles, not for continuous heavy-duty non-stop operation. Tell us your hoisting cycle frequency if you need a higher duty hook block.
Q: What inspections come with this 20Ton Crane Hook?
A: Each hook body gets 100% UT and MT non-destructive testing. The whole assembly also completes a 40-ton tensile load test with 5 minutes holding time. We can provide full test reports for your project documentation.
Q: Can I choose between Ø560 and Ø650 pulley base diameter?
A: Yes. Both pulley sizes are available for this 20Ton Crane Hook, matched for Ø28mm wire rope. Please specify pulley size when sending your inquiry.
Q: What is the standard paint finish?
A: Standard topcoat is black and yellow warning paint with total dry film thickness ≥180μm. We can provide heavy anti-corrosion coating for marine or salt air working conditions on request.
Q: What is the operating temperature range?
A: This 20 ton crane hook is designed for ambient temperature from -10°C to 45°C. Contact us if you need a hook for extreme low or high temperature working scenarios.
Call To Action
Reach out to us today for the quotation of the 20Ton Crane Hook. Please share your preferred pulley size, working environment and any special certification requirements. Our engineering team will review your request and reply promptly with full technical documentation.
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