GB/T 4307 Lifting Hook Terminology Standard Guide
GB/T 4307 "Lifting Hooks—Terminology" is a key technical specification in the crane industry. Developed by the national standards body, this terminology standard defines the vocabulary used for lifting hooks on cranes.
It provides a unified technical basis for designers, inspection bodies, and end users. Kelude strictly follows the technical requirements of this standard throughout its product development and manufacturing processes.
Application Scope and Positioning of the Standard
GB/T 4307 "Lifting Hooks—Terminology" specifies the technical requirements for the terminology of crane lifting hooks and applies to all types of lifting appliances with a Rated Lifting Capacity above 0.5 t. The standard covers not only the design and manufacturing of new equipment but also provides clear technical guidance for the inspection, maintenance, and modification of in-service equipment. It aligns with the EN 13001 Crane Safety Standard series and ISO 4309 Wire Rope Inspection Standard, together forming a complete technical specification framework. The clearly defined core technical parameters and Safety factor requirements give designers a solid design basis and offer third-party inspection bodies quantifiable acceptance criteria for Type Test and Factory Acceptance Test procedures. As a key component of the crane standard system, this standard works in coordination with the EN 13001 series and ISO 4309 to establish a comprehensive technical specification framework.
Core Technical Parameters and Requirements
Per the technical provisions of GB/T 4307, the design and manufacturing of lifting hooks must meet a series of stringent technical requirements. These parameters are established based on extensive test data and safety engineering principles, covering the entire process from material selection to structural design.
Comparative Analysis of Key Technical Parameters
| Item | technical requirements | Description |
|---|---|---|
| Hook Classification | Single Hook/Double Hook(Heavy Lifting)/C Type(Special) | All Typesapplication scope |
| Manufacturing Method | Forging(Primary)/Laminated Type(Large-Scale) | Strictly Prohibited Casting Build-up Welding Repair |
| Protection Load detachment | spring self-locking Laminated Type | Mandatory Accessory |
| Marking | Rated Lifting Capacity+Material Level+Manufacturer | Legible and Durable |
| Material | Forging Alloy Steel Yield≥355MPa | Impact≥34J(-20℃) |
| ISOCorresponding | ISO 1834(Specification)/ISO 1835(Dimension) | In Accordance with International Standards |
Inspection Requirements and Intervals
Factory Acceptance Tests are conducted on each unit at the manufacturer's facility by the quality inspection department. Equipment that passes inspection is accompanied by a detailed inspection report and a Certificate of Conformity. For equipment in service, the periodic inspection interval generally does not exceed 12 months.
| Item | technical requirements | Description |
|---|---|---|
| Clear Marking | Rated Lifting Capacity, Manufacturer May Identification | Annual+Replace if Illegible |
| Protection Load detachment | Functional | Monthly+Replace Upon Discovery |
| Surface | Crack/Wear/Deformation | Monthly+Visual |
| Magnetic Particle Testing (MT) | Bend Radius, thread relief groove | Annual+MT |
Safe Operation and Management Requirements
The standard places strong emphasis on operator qualification and training, requiring that all operators complete specialized training and obtain the necessary certifications before being allowed to operate the equipment.
Frequently Asked Questions
Q: What hook types are defined in the GB/T 4307 lifting hook terminology standard?
A: Single Hook (general purpose), Double Hook (heavy lifting), and C-Hook (special applications).
Q: What manufacturing process requirements does the GB/T 4307 standard impose on lifting hooks?
A: Forging is the primary manufacturing method; casting and weld repair are strictly prohibited. Laminated plate construction is used for large hooks.
Q: What marking requirements does the GB/T 4307 standard specify for lifting hooks?
A: Rated load, material grade, and manufacturer identification must be clearly marked and securely fixed to prevent detachment.
Q: What inspection types does the BS 466 standard require for cranes, and what are the specific load test requirements for factory and annual testing under AS 1418.2?
A: Monthly visual inspection plus load detachment prevention checks, with annual Magnetic Particle Testing (MT).
Kelude — Specialized in crane design and manufacturing.
