A first level sleeve is a steel bar connecting sleeve with a tensile strength of 596Mpa or more. Simply put, a first level sleeve is a steel bar connecting sleeve that reaches or exceeds 1.1 times the tensile strength of the steel bar base material.

Reinforcement sleeve connection belongs to mechanical connection, which is divided into one, two, and three levels. The first level is that the tensile strength of the joint is not less than the actual tensile strength of the connected reinforcement or 1.10 times the standard tensile strength of the reinforcement, and it has high ductility and repeated tensile and compressive performance.

The second level refers to the street tensile strength not less than the standard value of the tensile strength of the connected steel bars, and has high ductility and repeated tensile and compressive performance. Grade III refers to a street tensile strength that is not less than 1.35 times the standard yield strength of the connected steel bars, and has a certain degree of ductility and repeated tensile and compressive performance.

The specifications of steel bar straight thread sleeves are: 12 14 16 18 20 22 25 28 32 36 40. The commonly used specification is 16-32 steel sleeve, which is easy to operate, fast, and has a fast construction speed, greatly reducing the construction period.

The straight threaded sleeve is made of 45 seamless steel pipe, and the commonly used specifications are 16-32 straight threaded sleeves. Depending on the sleeve model, the seamless steel pipe is cut into the specified length

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