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N等级 规格表
N Grade KS Specifications — 12个尺寸
ISO 1302
ISON Grade
12 sizes| Ra Value | Type | Rzμm | Process | Symbol | Use |
|---|---|---|---|---|---|
| N1 (Ra 0.025) | N等级 | 0.1 | ▽▽▽▽ | Super Fine | |
| N2 (Ra 0.05) | N等级 | 0.2 | ▽▽▽▽ | Super Fine | |
| N3 (Ra 0.1) | N等级 | 0.4 | Grinding | ▽▽▽ | Fine |
| N4 (Ra 0.2) | N等级 | 0.8 | Grinding | ▽▽▽ | Fine |
| N5 (Ra 0.4) | N等级 | 1.6 | Grinding | ▽▽▽ | Fine |
| N6 (Ra 0.8) | N等级 | 3.2 | · | ▽▽ | 通用 |
| N7 (Ra 1.6) | N等级 | 6.3 | · | ▽▽ | 通用 |
| N8 (Ra 3.2) | N等级 | 12.5 | · | ▽ | 通用 |
| N9 (Ra 6.3) | N等级 | 25 | · | ▽ | |
| N10 (Ra 12.5) | N等级 | 50 | ~ | ||
| N11 (Ra 25) | N等级 | 100 | ~ | 毛坯面 | |
| N12 (Ra 50) | N等级 | 200 | · | ~ | 毛坯面 |
This specification follows ISO (International Organization for Standardization) standards. ISO ensures cross-border compatibility, making it ideal for multinational projects, export equipment design, and global parts procurement.
按N1~N12等级体系分类的表面粗糙度表。对应ISO 1302的Ra值。
实务注意事项
- N1–N12等级对应Ra值。N6=Ra 0.8、N7=Ra 1.6、N8=Ra 3.2、N9=Ra 6.3。
主要特点
- ISO 1302 N1–N12等级体系;各等级对应特定Ra值(N7 = Ra 1.6等)
- 以图纸符号简洁标注;未标Ra数值时仅用N等级即可指定粗糙度
- N等级每差一级 ≈ Ra翻倍;等级数字越大表面越粗糙
主要应用领域
旧图兼容(三角符号→N等级转换)、国际标准图纸标注、铸件/锻件表面等级指定
常见问题
N7等级的Ra值是多少?
N7 = Ra 1.6μm。N1=Ra 0.025, N4=Ra 0.2, N6=Ra 0.8, N7=Ra 1.6, N8=Ra 3.2, N9=Ra 6.3, N10=Ra 12.5。