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Let's conduct an in-depth and systematic review of the professional knowledge related to lifting chains. This is not just a 'stronger chain', but a professional field involving strict standards, precision manufacturing, and safety management.

Definition and core characteristics of lifting chain
A lifting chain is a rigging specifically designed for lifting, pulling, or tying heavy objects. Compared with the transmission chain, its core characteristics are:

·High safety: The design has a high safety factor, and the material and process requirements are extremely strict.
·High toughness: It can withstand not only static loads, but also impact loads and variable loads.
·Easy to bind: With good flexibility, it can adapt to objects of various shapes.
·Durable: With proper use and maintenance, it has a longer lifespan.

Specification identification of lifting chain
Usually represented by the material diameter d and pitch p of the chain link. For example: T (8) grade chain, 10 x 40 mm
·10 mm: The diameter d of the chain link material (a critical dimension that determines the load-bearing capacity).
·40mm: Inner width/pitch p of the chain link.
·T (8) level: Strength level.

Terminal connectors for lifting chains
Chains are rarely used alone and must be paired with corresponding connecting and lifting components to form a complete rigging.

·Hook: There are eye shaped hooks, sheep horn hooks, C-shaped hooks, etc., which need to be matched with the chain grade.
·Shackle: used to connect the end eye of the chain with other devices.
·Chain link: such as "8" ring, connecting ring, etc., used for splicing or repairing chains.
·Adjuster (basket screw): used to fine tune the length and tension of the chain.

Safe use and maintenance
This is the top priority in the knowledge system of lifting chains.
1. Pre use inspection
Visual inspection must be conducted by the user before each use.
2. Regular professional inspections
According to the frequency of use and operating conditions, professional personnel need to conduct detailed inspections regularly, and the inspection cycle is determined by risk assessment.

Usage norms and taboos
·DO (correct practice):
·Ensure that the load is evenly distributed across multiple chains.
·When lifting, the smaller the angle between the chain and the vertical line, the better. An increase in the angle will significantly increase the force on a single chain.
·Use appropriate protective padding to prevent the chain from being cut by sharp edges.

·Operate slowly and steadily to avoid impact loads.
·DON'S T (Prohibited Matters):
·Overloading is strictly prohibited.
·It is strictly prohibited to twist, knot or entangle on sharp objects.
·It is strictly prohibited to directly weld, bolt or knot to repair broken chains.
·Throwing or hitting chains is strictly prohibited.
·Heating (blueing) or any treatment that may alter the metal properties is strictly prohibited.

Please remember the following process when selecting and using lifting chains:
1. Confirm operating conditions: load, environment, frequency.
2. Level selection: T (8) level is preferred for optimal overall performance.
3. Calculation specifications: Determine the required chain link diameter d based on the working load and safety factor.
4. Complete configuration: Select the matching level of connectors (hooks, shackles).
5. Strict inspection: Pre use inspection and regular professional inspection are indispensable.
6. Standardized operation: Adhere to safety regulations and eliminate rough operations.

The lifting chain is a safety guardian, and the value of its professional knowledge lies in transforming "feeling okay" into "confirming safety and reliability".