NPT
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| TPI | Standard | d | D | No. Of Flutes |
l | L | Part Number |
| NO COOLANT PASSAGE | |||||||
| 27 | 1/8 | 1/4 | .250 | 3 | .39 | 2.5 | T-CT27NPT-100 |
| 18 | 1/4-3/8 | 5/16 | .312 | 3 | .58 | 2.5 | T-CT18NPT-105 |
| 14 | 1/2-3/4 | 1/2 | .500 | 4 | .82 | 3.0 | T-CT14NPT-110 |
| 11.5 | 1-2 | 5/8 | .625 | 4 | 1.09 | 4.0 | T-CT115NPT-115 |
| 8 | >21/2 | 3/4 | .750 | 4 | 1.56 | 4.0 | T-CT8NPT-120 |
| WITH THRU COOLANT HOLE | |||||||
| 27 | 1/8 | 5/16 | .299 | 3 | .43 | 2.5 | T-CT27NPT-125C |
| 18 | 1/4-3/8 | 3/8 | .375 | 4 | .64 | 3.0 | T-CT18NPT-130C |
| 14 | 1/2-3/4 | 5/8 | .610 | 4 | .89 | 4.0 | T-CT14NPT-135C |
| 11.5 | 1-2 | 3/4 | .750 | 4 | 1.17 | 4.0 | T-CT115NPT-140C |