| 标准编号 | TS121-4 |
| 标准名称 | TS121 Manufacturing Specification for Studs, Bolts and Screws in DTD5639, EN2959 and EN3220 Material 1210 MPa (175,000 lbf/in脗虏) Tensile at Room Temperature (for which Forging is Optional and Qualification is not a Requirement |
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