During the construction process, it is common to encounter situations where the rebar coupling sleeve cannot be screwed onto the rebar thread. The reasons for the rebar coupling sleeve failing to screw on are as follows:

First, the pitch of the internal threads in the rebar coupling sleeve differs from the pitch of the rebar thread. Hengshui Keyuan Rebar Connection Equipment Co., Ltd. produces rebar coupling sleeves with the following pitches:

For Φ16, Φ18, Φ20, and Φ22 rebar coupling sleeves, the pitch is 2.5mm.

For Φ25, Φ28, Φ32, and Φ36 rebar coupling sleeves, the pitch is 3.0mm.

For Φ40 rebar coupling sleeves, the pitch can be either 3.0mm or 3.5mm.

Second, the thread angle of the rebar coupling sleeve differs from the thread angle of the rebar thread.

   Hengshui Keyuan Rebar Connection Equipment Co., Ltd. produces rebar coupling sleeves with thread angles of 75° and 60°, which are commonly used in the market. Some companies produce sleeves with a thread angle of 70°, but this is an isolated case.

Third, the rebar thread has been cut too large. During the threading process, errors may occur due to insufficient adjustment precision of the threading machine, resulting in an oversized rebar thread. Alternatively, if the threading machine's gear disc is not tightened properly or the eccentric shaft shifts, it can also cause the rebar thread to become oversized. If the thread is not promptly tested with a ring gauge or a rebar coupling sleeve, the prefabricated rebar thread may end up significantly oversized. In such cases, the only solution is to have the rebar coupling sleeve manufacturer produce an enlarged sleeve to match the oversized rebar thread. Hengshui Keyuan Rebar Connection Equipment Co., Ltd. can produce enlarged sleeves tailored to the thread size provided by the customer, with fast turnaround and high efficiency. We welcome inquiries and discussions. You can search for the company name on Baidu to find contact information.