Variable diameter steel bar straight threaded sleeve is used to connect steel bars of different diameters, such as building column bars. Generally, the steel bars are thinner as they go up. This requires the use of variable diameter steel bar straight threaded sleeve. For example, due to construction needs, steel bars above 32 need to use 28 steel bars, which requires a variable diameter steel bar straight threaded sleeve with a diameter of 32 to 28. Normally, the diameter change does not exceed two levels.

The straight threaded sleeve of variable diameter steel bars has the following advantages:

(1) Eliminating the need for inserting or planting reinforcing bars facilitates construction.

(2) Ensure that the transmission of force is in a straight line.

(3) When conducting testing, follow the inspection standards for small-diameter steel bars.

Variable diameter steel bar straight thread sleeve also has the advantages of ordinary steel bar straight thread sleeve:

(1) High tensile strength, meeting or exceeding the requirements of the national standard JGJ107-2016 Grade I joint.

(2) Good for neutrality, facilitating the transmission of force.

(3) The construction operation is convenient and can be carried out in all directions and 24/7.

(4) Prefabrication can be done in advance, which shortens the total project duration.

(5) The price is cheap, which reduces the engineering cost.

(6) No open flame operation and no live operation are products promoted by the Ministry of Construction.

(7) Due to the fact that the variable diameter steel bar straight thread sleeve is a machined product, its quality stability (uniformity) is high.

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