
| Size | Class | Recomm Hole Siz Max. | ended e(mm) Min. | thread engagement ratio (Estimation %) | ref.Minor of interna (5H/ Max. | diameter l threads 6H) Min. | Size | Class | Recom Hole Si Max. | mended ze(mm) Min. | thread engagement ratio (Estimation %) | ref.Minor of intern (5H Max. | diameter al threads /6H) Min. unit: mm |
| M1×0.25 I | SO2X | 0.92 | 0.89 | 80~100 | 0.785 | 0.729 | M8×1.25 | ISO2X | 7.52 | 7.39 | 80~100 | 6.912 | 6.647 |
| I | SO3X | 0.91 | 0.89 | 75~90 | ISO3X | 7.51 | 7.41 | 80~95 | |||||
| M12025 I | SO2X | 1.11 | 1.09 | 80~100 | 0985 | 0929 | M81 | ISO2X | 7.60 | 7.49 | 80~100 | 7153 | 6917 |
| .×. I | SO3X | 1.11 | 1.09 | 75~90 | . | . | × | ISO3X | 7.60 | 7.52 | 80~95 | . | . |
| M1403 I | SO2X | 1.30 | 1.26 | 80~100 | 1142 | 1075 | M1015 | ISO2X | 9.38 | 9.26 | 85~100 | 8676 | 8376 |
| .×. I | SO3X | 1.30 | 1.27 | 70~90 | . | . | ×. | ISO3X | 9.41 | 9.29 | 80~95 | . | . |
| M1.6×0.35 I | SO2X | 1.47 | 1.43 | 75~100 | 1.321 | 1.221 | M10×1.25 | ISO2X | 9.52 | 9.38 | 80~100 | 8.912 | 8.647 |
| I | SO3X | 1.48 | 1.44 | 70~95 | ISO3X | 9.50 | 9.40 | 80~95 | |||||
| M204 I | SO2X | 1.85 | 1.80 | 75~100 | M12175 | ISO2X | 11.27 | 11.13 | 85~100 | ||||
| ×. I | SO3X | 1.87 | 1.81 | 70~95 | 1.679 | 1.567 | ×. | ISO3X | 11.26 | 11.17 | 85~95 | 10.441 | 10.106 |
| M204 I | SO2X | 2.34 | 2.27 | 75~100 | M121 | ISO2X | 11.42 | 11.25 | 85~100 | ||||
| .5×.5 I | SO3X | 2.34 | 2.29 | 75~95 | 2.138 | 2.013 | ×.5 | ISO3X | 11.40 | 11.28 | 80~95 | 10.676 | 10.376 |
| M3×0.5 I | SO2X | 2.83 | 2.76 | 75~100 | 2.599 | 2.459 | M12×1.25 | ISO2X | 11.51 | 11.37 | 80~100 | 10.912 | 10.647 |
| I | SO3X | 2.82 | 2.76 | 75~95 | ISO3X | 11.50 | 11.40 | 80~95 | |||||
| M3.5×0.6 I | SO2X | 3.30 | 3.22 | 75~100 | 3.010 | 2.850 | M14×2 | ISO2X | 13.17 | 13.00 | 85~100 | 12.210 | 11.835 |
| I | SO3X | 3.28 | 3.22 | 75~95 | ISO3X | 13.15 | 13.05 | 85~95 | |||||
| I | SO2X | 3.73 | 3.66 | 80~100 | ISO2X | 13.36 | 13.23 | 85~100 | |||||
| M4×0.7 I | SO3X | 3.74 | 3.67 | 75~95 | 3.422 | 3.242 | M14×1.5 | ISO3X | 13.40 | 13.28 | 80~95 | 12.676 | 12.376 |
| I | SO2X | 4.68 | 4.60 | 80~100 | ISO2X | 15.17 | 15.00 | 85~100 | |||||
| M5×0.8 I | SO3X | 4.71 | 4.62 | 75~95 | 4.334 | 4.134 | M16×2 | ISO3X | 15.15 | 15.04 | 85~95 | 14.210 | 13.835 |
| I | SO2X | 5.60 | 5.50 | 80~100 | ISO2X | 15.35 | 15.23 | 85~100 | |||||
| M6×1 I | SO3X | 5.61 | 5.53 | 80~95 | 5.153 | 4.917 | M16×1.5 | ISO3X | 15.40 | 15.27 | 80~95 | 14.676 | 14.376 |