Technical Description and Application
The international standard regulates the geometric parameters and manufacturing quality requirements for low hexagon nuts (product grade 0) without chamfer. The nomenclature covers a range of metric threads from M1.6 to M10, corresponding to product grade B. These fasteners are designed for use in high-precision assembly units where a minimal profile height is critical.
For cases not covered by this regulation, or if specific tolerances are required, reference should be made to ISO 965-1, ISO 4759-1, and relevant international specifications.
Geometric Parameters
The size nomenclature and letter designations correspond to the ISO 225 specification. All linear dimensions are in millimeters.
Table 1. Dimensions of hexagon nuts (mm)
| Thread | M1.6 | M2 | M2.5 | M3 | M3.5 | M4 | M5 | M6 | M8 | M10 |
| P (pitch) | 0.35 | 0.4 | 0.45 | 0.5 | 0.6 | 0.7 | 0.8 | 1 | 1.25 | 1.5 |
| e (min.) | 3.28 | 4.18 | 5.31 | 5.88 | 6.44 | 7.50 | 8.63 | 10.89 | 14.20 | 17.59 |
| m (max.) | 1.0 | 1.2 | 1.6 | 1.8 | 2.0 | 2.2 | 2.7 | 3.2 | 4.0 | 5.0 |
| m (min.) | 0.75 | 0.95 | 1.35 | 1.55 | 1.75 | 1.95 | 2.45 | 2.9 | 3.7 | 4.7 |
| s (max.) | 3.2 | 4.0 | 5.0 | 5.5 | 6.0 | 7.0 | 8.0 | 10.0 | 13.0 | 16.0 |
| s (min.) | 2.9 | 3.7 | 4.7 | 5.2 | 5.7 | 6.64 | 7.64 | 9.64 | 12.57 | 15.57 |
Technical Conditions and Quality Standards of EV Group China
| Material | Steel | Non-ferrous alloys |
| General requirements | ISO 8992 | |
| Thread tolerance class | 6H (according to ISO 724, ISO 965-1) | |
| Min. hardness | 110 HV 30 | According to ISO 8839 requirements |
| Product grade | B (according to ISO 4759-1) | |
| Surface quality and protection | Zinc flake coating (ISO 10683) | – |
| Electroplating (ISO 4042) | ||
| Alternative finishing methods upon customer agreement | ||
| Surface condition | Tolerances according to ISO 6157-2 | |
| Testing | Conducted according to ISO 3269 specification | |