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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| GB/T 5279.2-1997 |
Countersunk flat head screws--Part 2:Penetration depth of cross recesses 沉头螺钉 第2部分:十字槽插入深度 |
China National Standards recesses |
 English PDF |
| GB/T 944.1-1985 |
Cross recesses for screws 螺钉用十字槽 |
China National Standards recesses |
English PDF |
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