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Steel Bar Coupler
On-Site Assembly Type
On-site assembly type coupler is a device that utilizes a wedge providing a simple method to connect two steel bars on construction site without making any chemical or physical changes to the original steel bars produced in a factory.
| Test Categoty | Unit | SD300 | SD350 | SD400 | SD500 |
|---|---|---|---|---|---|
| Unidirectional Tensile Test (125% or more of the yield stress) |
N/㎟ | 440 or more | 490 or more | 560 or more | 620 or more |
| Unidirectional Tensile Test (yield point) |
N/㎟ | 330 or more | 350 or more | 400 or more | 500 or more |
Mechanical Assembly Type
Mechanical assembly type is the most ensuring method to obtain joining strength of steel bars although extra processing for steel bars is necessary. Steel bars are connected using a screw-threaded coupler after rolling, rounding and threading the joint parts of steel bars.
| Test Category | Unit | SD300 | SD350 | SD400 | SD500 |
|---|---|---|---|---|---|
| Unidirectional Tensile Test (125% or more of the yield stress) |
N/㎟ | 440 or more | 490 or more | 560 or more | 620 or more |
| Unidirectional Tensile Test (yield point) |
N/㎟ | 300 or more | 350 or more | 400 or more | 500 or more |
| Static Yield Strength Test (residual deformation) |
㎜ | Maximum residue deformation: 0.3mm or below | |||
| Low Cycle Fatigue Test (tensile strength) |
N/㎟ | 125% of yield strength of a steel bar or more | |||
