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Introduction of Roof Rebar Rock Bolts Mining Bolting Industry Rock Bolt Self Drilling Tunnel Full Threaded Mine Steel Bar Hollow Grouting Anchor Rod
| Material | Yield strength | Tensile strength | Elongation | Yield Load | Tensile Load | Kg/m |
| 20MnSi | (MPa) | (MPa) | (%) | (KN) | (KN) | |
| φ16 | >=345 | >=510 | >=25 | >=69 | >=100 | 1.6 |
| φ18 | >=345 | >=510 | >=25 | >=87 | >=126 | 2 |
| φ20 | >=345 | >=510 | >=25 | >=108 | >=156 | 2.5 |
| φ22 | >=345 | >=510 | >=25 | >=131 | >=189 | 3 |
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