CLASS 4 TAPPING THREAD FOR USE IN METAL OR PLASTIC
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Technical Data
| Screw diameter | Threads per inch | Point angle | Thread angle | Minor Diameter Min | Minor Diameter Max | Major Diameter Min | Major Diameter Max |
| M2 | 40 | 45 degree | 60 degree | 1.4 | 1.5 | 1.9 | 2 |
| M2.5 | 28 | 45 degree | 60 degree | 1.8 | 1.9 | 2.4 | 2.5 |
| M3 | 24 | 45 degree | 60 degree | 2.2 | 2.3 | 2.9 | 3 |
| ( M3.5 ) | 20 | 45 degree | 60 degree | 2.6 | 2.7 | 3.4 | 3.5 |
| M4 | 18 | 45 degree | 60 degree | 2.9 | 3 | 3.85 | 4 |
| M5 | 16 | 45 degree | 60 degree | 3.6 | 3.8 | 4.85 | 5 |
| M6 | 14 | 45 degree | 60 degree | 4.4 | 4.6 | 5.85 | 6 |
| M8 | 12 | 45 degree | 60 degree | 5.9 | 6.1 | 7.8 | 8 |
| S Type | Hole Size | ||||||||
| Trilobular | In metal sheet | ||||||||
| In mm | 0.6 sheet | 0.8 sheet | 1.0 sheet | 1.2 sheet | 1.6 sheet | 2.0 sheet | 2.6 sheet | 3.2 sheet | 4.0 Sheet |
| 2 | 1.76 | 1.78 | 1.8 | 1.83 | 1.85 | ||||
| 2.3 | 2.05 | 2.07 | 2.08 | 2.1 | 2.13 | ||||
| 2.5 | 2.23 | 2.24 | 2.26 | 2.28 | 2.31 | 2.33 | |||
| 2.6 | 2.33 | 2.34 | 2.36 | 2.38 | 2.41 | 2.43 | 2.46 | ||
| 3 | 2.7 | 2.72 | 2.74 | 2.76 | 2.78 | 2.81 | 2.86 | 2.86 | |
| 3.5 | 3.15 | 3.17 | 3.2 | 3.23 | 3.27 | 3.29 | 3.32 | 3.34 | |
| 4 | 3.61 | 3.64 | 3.67 | 3.71 | 3.75 | 3.78 | 3.81 | 3.83 | |
| 5 | 4.57 | 4.62 | 4.64 | 4.66 | 4.71 | 4.77 | 4.8 | 4.81 | |
| 6 | 5.53 | 5.56 | 5.59 | 5.63 | 5.7 | 5.74 | 5.79 | ||
| 8 | 7.52 | 7.56 | 7.61 | 7.67 | 7.73 |
| P Type | Hole Size | |
| Trilobular | in plastic boss | |
| ABS / Polyprop | ||
| in mm | UP TO 2 D OF THREAD ENGAGEMENT | ABOVE 2 D OF THREAD ENGAGEMENT |
| 2 | 1.7 | 1.75 |
| 2.3 | 2 | 2.05 |
| 2.5 | 2.1 | 2.15 |
| 2.6 | 2.2 | 2.25 |
| 3 | 2.5 | 2.6 |
| 3.5 | 3.02 | 3.1 |
| 4 | 3.44 | 3.55 |
| 5 | 4.37 | 4.45 |
| 6 | 5.26 | 5.35 |
| 8 | 7.16 | 7.25 |
| B TYPE | Hole Size | |||||||
| Trilobular | In metal sheet | |||||||
| in mm | 0.6 sheet | 0.8 sheet | 1.0 sheet | 1.2 sheet | 1.6 sheet | 2.0 sheet | 2.6 sheet | 3.2 sheet |
| 2 | 1.55 | 1.6 | 1.6 | 1.6 | 1.65 | 1.65 | 1.7 | |
| 2.3 | 1.9 | 1.9 | 1.9 | 1.95 | 1.95 | 1.95 | 2 | |
| 2.6 | 2.15 | 2.15 | 2.2 | 2.2 | 2.2 | 2.25 | 2.25 | 2.3 |
| 3 | 2.65 | 2.65 | 2.65 | 2.7 | 2.7 | 2.7 | 2.7 | 2.75 |
| 3.5 | 3.05 | 3.05 | 3.05 | 3.1 | 3.1 | 3.1 | 3.15 | 3.15 |
| 4 | 3.6 | 3.6 | 3.6 | 3.6 | 3.65 | 3.65 | 3.65 | 3.65 |
| 5 | 4.5 | 4.5 | 4.5 | 4.55 | 4.55 | 4.6 | 4.6 | |
| 6 | 5.3 | 5.3 | 5.4 | 5.4 | 5.5 | 5.5 | ||
| 8 | 7.3 | 7.3 | 7.3 | 7.3 | 7.4 | 7.4 | ||
| B TYPE | Hole Size | |||||||
| Trilobular | in plastic boss | |||||||
| ABS / Polyprop | figures | shown are | diameter of | Thread | engagement | used | ||
| in mm | 1 D | 1.5 D | 2 D | 2.5 D | 3 D | 3.5 D | 4 D | |
| 2 | 1.62 | 1.65 | 1.68 | 1.71 | 1.73 | 1.75 | 1.77 | |
| 2.3 | 1.85 | 1.91 | 1.95 | 1.97 | 1.99 | 2.03 | 2.06 | |
| 2.6 | 2.1 | 2.15 | 2.19 | 2.21 | 2.24 | 2.26 | 2.29 | |
| 3 | 2.44 | 2.49 | 2.51 | 2.54 | 2.59 | 2.65 | 2.68 | |
| 3.5 | 2.91 | 2.94 | 2.97 | 3.03 | 3.1 | 3.14 | 3.17 | |
| 4 | 3.33 | 3.39 | 3.43 | 3.47 | 3.54 | 3.58 | 3.62 | |
| 5 | 4.21 | 4.33 | 4.38 | 4.43 | 4.53 | 4.58 | 4.63 | |
| 6 | 5.12 | 5.27 | 5.33 | 5.44 | 5.51 | 5.57 | 5.57 | |
| 8 | 6.88 | 6.99 | 7.13 | 7.28 | 7.36 | 7.43 | 7.44 |
4 and under
SCREW LENGTH JIS Machine screws & S-Type
| Diameter length tolerance | M2.6 and below | Over M2.6 to M4.5 | Over 4.5 |
| 4 and under | 0-0.3 | - | - |
| Over 4 to 10 | 0-0.4 | 0-0.6 | 0-0.8 |
| Over 10 to 20 | 0-0.6 | 0-0.6 | 0-1 |
| Over 20 to 40 | 0-0.8 | 0-0.8 | 0-1 |
| Over 40 | - | 0 | 0 |
SCREW LENGTH JIS Tapping screws & B-Type & P-Type
| Diameter length tolerance | Tapping Pointed | Tapping blunt | B Type and P Type |
| 4 and under | +/- 0.8 | 0-0.8 | 0-0.8 |
| Over 4 to 16 | +/- 0.8 | 0-0.8 | 0-0.8 |
| Over 16 to 25 | +/- 0.8 | 0-1.2 | 0-1.2 |
| Over 25 to 36 | +/- 1.2 | 0-1.2 | 0-1.2 |
| Over 36 | +/- 1.2 | 0-1.6 | 0-1.6 |
