ISO 2901 & 2903 Class 7H. Used on metric locknuts size 44 and larger.
| Major Dia | Pitch Dia | Minor Dia | ||||
|---|---|---|---|---|---|---|
| Thread Size | Pitch | Max | Min | Max | Min | Max |
| TR220 | 4 | 220,000 | 219,700 | 217,810 | 217.469 | 215,500 |
| TR240 | 4 | 240,000 | 239,700 | 237,810 | 237,469 | 235,500 |
| TR260 | 4 | 260,000 | 259,700 | 257,810 | 257,469 | 255,500 |
| TR280 | 4 | 280,000 | 279,700 | 277,810 | 277,469 | 275,500 |
| TR300 | 4 | 300,000 | 299,700 | 297,810 | 297,469 | 295,500 |
| TR320 | 5 | 320,000 | 319,665 | 317,288 | 316,906 | 314,500 |
| TR340 | 5 | 340,000 | 339,665 | 337,288 | 336,916 | 334,500 |
| TR360 | 5 | 360,000 | 359,665 | 357,288 | 356,916 | 354,500 |
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