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| Chinese National Standard Category: Cutting tools |
| English Title: | Subland twist drills for holes prior to tapping screw threads |
| Chinese Title: | 攻丝前钻孔用阶梯麻花钻 |
| Standard No.: | GB/T 6138-2023 |
| Category No.: | J41 |
| Issued by: | SAMR; SAC |
| Issued on: | 2023-9-7 |
| Implemented on: | 2024-4-1 |
| Status: | valid |
| Superseded by: | |
| Superseded on: | |
| Abolished on: | |
| Superseding: | GB/T 6138.1-2007 Subland twist drills for holes prior to tapping screw threads -Part1:The types and dimensions of subland twist drills with cylindrical shanks GB/T 6138.2-2007 Subland twist drills for holes prior to tapping screw threads -Part2:The types and dimensions of Subland twist drills with Morse typer shanks |
| Word Count: | 7000 words |
| Similar Standards: | GB/T 16770.1-2025 GB/T 20331-2025 GB/T 10944.3-2025 GB/T 6120-2025 GB 3466-1983 GB 6131-1985 GB 6116-1985 GB 1118-1985 GB 6119-1985 GB 6139-1985 GB/Z 29014.3-2024 GB/T 9211-1988 GB 10954-1989 GB 10948-1989 GB/Z 29014.5-2024 GB/Z 29014.2-2024 GB/Z 29014.1-2024 GB/Z 29014.4-2024 GB/Z 29014.100-2024 GB 4265-1984 |
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