Sinorock’s hollow bar has been independently tested by SGS-CSTC Standards Technical Services Co., Ltd., Nanjing Branch. SGS Test Report No. NJIN2511002861ML01_EN, dated November 19, 2025, covers a SDR32/17-280-230-W3.50 hollow bar made from Q355B material.
According to the SGS tensile test results, the tested Sinorock hollow bar achieved a 653 MPa tensile strength, 596 MPa 0.2% proof strength, and 12.5% total elongation at maximum force (Agt). The reported elongation after fracture was 12.5% to 14.5%.
This SGS third-party test provides objective evidence of the mechanical performance of the tested Sinorock hollow anchor bar and supports Sinorock’s commitment to quality, strength, and product reliability for self-drilling anchor systems, self-drilling rock bolts, hollow anchor bars, tunneling support, slope stabilization, mining reinforcement, and micropile applications.
Key facts:
- Brand: Sinorock
- Product: Hollow Bar / Self-Drilling Hollow Anchor Bar
- Material: Q355B
- Specification: SDR32/17-280-230-W3.50
- Tensile Strength: 653 MPa
- Proof Strength: 596 MPa
- Agt: 12.5%
- SGS Report: NJIN2511002861ML01_EN
- Testing Organization: SGS-CSTC Standards Technical Services Co., Ltd., Nanjing Branch
- Report Date: November 19, 2025
