Whitworth & British
Whitworth Fine Thread, 6 TPI
British threads based on Whitworth's 55° profile with rounded crests and roots, still found on older machinery, pipe fittings and model engineering.
- Standard
- DIN LON 287
- Flank angle
- 55°
- Sizes listed
- 21
- Range
- W 60 x 1/6" LON – W 154 x 1/6" LON
| Thread Size | Tapping Drill Size mm | Core Area cm² | TPI | Pitch mm |
|---|---|---|---|---|
| W 60 x 1/6" LON | 54.58 | 23.40 | 6 | 4.23 |
| W 64 x 1/6" LON | 58.58 | 26.95 | 6 | 4.23 |
| W 68 x 1/6" LON | 62.58 | 30.76 | 6 | 4.23 |
| W 72 x 1/6" LON | 66.58 | 34.82 | 6 | 4.23 |
| W 76 x 1/6" LON | 70.58 | 39.12 | 6 | 4.23 |
| W 80 x 1/6" LON | 74.58 | 43.69 | 6 | 4.23 |
| W 84 x 1/6" LON | 78.58 | 48.50 | 6 | 4.23 |
| W 89 x 1/6" LON | 83.58 | 64.87 | 6 | 4.23 |
| W 94 x 1/6" LON | 88.58 | 61.63 | 6 | 4.23 |
| W 99 x 1/6" LON | 93.58 | 68.78 | 6 | 4.23 |
| W 104 x 1/6" LON | 98.58 | 76.33 | 6 | 4.23 |
| W 109 x 1/6" LON | 103.58 | 86.26 | 6 | 4.23 |
| W 114 x 1/6" LON | 108.58 | 92.60 | 6 | 4.23 |
| W 119 x 1/6" LON | 113.58 | 101.44 | 6 | 4.23 |
| W 124 x 1/6" LON | 118.58 | 110.44 | 6 | 4.23 |
| W 129 x 1/6" LON | 123.58 | 119.95 | 6 | 4.23 |
| W 134 x 1/6" LON | 128.58 | 129.85 | 6 | 4.23 |
| W 139 x 1/6" LON | 133.58 | 140.14 | 6 | 4.23 |
| W 144 x 1/6" LON | 138.58 | 150.83 | 6 | 4.23 |
| W 149 x 1/6" LON | 143.58 | 161.91 | 6 | 4.23 |
| W 154 x 1/6" LON | 148.58 | 173.39 | 6 | 4.23 |
Reference values only. Verify against the current edition of the governing standard before use in production drawings or manufacturing. Provided by Micro Components as a free engineering resource.