Workers may encounter the problem that the rebar sleeve cannot be screwed on the wire head during the construction. Why the threaded steel sleeve cannot be tightened? Here let's talk about the reason:

1. The threaded pitch of rebar sleeve is different from that of the wire head.

The pitch of Φ16, Φ18, Φ20, Φ22 rebar sleeve is 2.5mm, and Φ25, Φ28, Φ32, Φ36 rebar sleeve is 3.0mm.

The pitches of Φ40 steel sleeves are 3.0mm and 3.5mm.

2. The tooth angle of the rebar sleeve of the steel bar is different from the tooth angle of the steel wire head. There are two types of rebar sleeve with tooth angles of 75° and 60°.

3. The wire hood is too big. Due to the insufficient adjustment accuracy of the rolling mill during the threading process, there will be deviations. The wire head cover is too large, or the gear plate of the steel bar rolling machine is not compressed, and the eccentric shaft of the rolling machine has moved.

Above are reasons may cause the threaded rebar sleeve fail to be tightened, so the on-site construction have to analysis the reason to find solution.