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| International Standard Category: Bolts, screws, studs |
QJ 38-1987 Cheese-head Set Screw
圆柱头紧定螺钉 ;
| Category No.: | 49.030.20 | Valid Status: | valid |
| Issued Organization: | Issued Date: | 1987-12-18 | |
| Implemented Date: | 1987-12-1 | Abolished Date: | |
| Superseded Standard.: | Superseded Date: |
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