Advantages:
1.Allows maximum bar cross-section to be used.
2. Smallest diameter in the industry reduces need for concrete cover and eliminates rebar congestion
3. Short length and slim design ensure the least disturbance to uniform stiffness
4. Splice strength is independent of rebar deformation 
5.Unique tapered thread requires no lock nuts and provides a positive locking, no-slip connection .
6.Any length, shape, diameter or combination of bar sizes can be mechanically spliced.

Application Scenarios and Positions

1. Main bar diameter change in columns (most commonly used and recommended)
Frame columns, shear wall columns, stair columns, and construction columns
When the diameter of the steel bars decreases as the floor level increases: diameter-changing coupler are the best solution.
2. Vertical bar diameter change in shear walls
From large diameter at the bottom to small diameter at the top of shear walls, diameter-changing coupler are faster and more reliable in quality.
3. Main bar diameter change in beams
Frame beams, secondary beams, and foundation beams: when the diameters of the longitudinal bars and support bars are different, diameter-changing couplers are more reliable and faster than welding or lapping.
4. Diameter-changing parts in foundations and basements
Main bars of pile foundations connecting to columns, and main bars of pile caps and foundation beams: in critical load-bearing parts underground, diameter-changing coupler should be given priority.

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