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As one of the most traditional representatives of mechanical joints, taper thread coupler working principle is to process conical threads at the end of the reinforcing bar and tighten and fix it through a coupler with internal conical threads.
In recent years, on the basis of the common type of conical thread joint, a classic among rebar coupler types, by adding the pre-pressing or rough forging process at the end of the reinforcing bar, the GK type reinforcing bar equal strength conical thread joint has been developed, which can be as strong as the base material.
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| Dia of Rebar | Outer Dia | Length | H1 | H2 | Thread |
| (mm) | (mm) | (mm) | (mm) | (mm) | (M*T) |
| Φ16 | 24 | 65 | 30 | 30 | 16*2.5 |
| Φ18 | 27 | 75 | 35 | 35 | 18*2.5 |
| Φ20 | 29 | 85 | 40 | 40 | 20*2.5 |
| Φ22 | 31 | 90 | 43 | 43 | 20*2.5 |
| Φ25 | 35 | 95 | 45 | 45 | 25*2.5 |
| Φ28 | 39 | 105 | 50 | 50 | 28*2.5 |
| Φ32 | 44 | 115 | 55 | 55 | 32*2.5 |
| Φ36 | 49 | 125 | 60 | 60 | 36*2.5 |
| Φ40 | 54 | 135 | 65 | 65 | 40*2.5（3) |
| Φ50 | 69 | 150 | 70 | 70 | 50*2.5(3) |
Taper thread coupler is fast connection speed and good alignment; Safe and reliable, easy to operate, and capable of withstanding both tensile and compressive forces.
