40mm Rebar Coupler with Right and Left Hand Threads

What to do if the rebar coupling sleeve cannot be screwed on?

During the construction process of rebar connections, it is common to encounter situations where the rebar coupling sleeve cannot be screwed onto the threaded end. The reasons for the rebar coupling sleeve failing to screw on include the following:

First, the thread pitch of the internal threads in the rebar coupling sleeve differs from the thread pitch of the rebar threaded end. The thread pitches of rebar coupling sleeves produced by Hengshui Keyuan Rebar Connection Equipment Co., Ltd. are as follows:

The thread pitch for Φ16, Φ18, Φ20, and Φ22 rebar coupling sleeves is 2.5mm.

The thread pitch for Φ25, Φ28, Φ32, and Φ36 rebar coupling sleeves is 3.0mm.

The thread pitch for Φ40 rebar coupling sleeves is either 3.0mm or 3.5mm.

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

   The thread angles of rebar coupling sleeves produced by Hengshui Keyuan Rebar Connection Equipment Co., Ltd. are 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 occurrence.

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