THREAD MILLS – NUMBER OF PASSES TABLE

Recommended number of passes and radial depth of cut per pass for female BSP thread (55°).

12 3Radial depth of cut per pass [mm]
1"2819 1411
10.2250.271 0.3180.362
2 s0.1860.224 0.2630.299
3 asse0.1700.205 0.2410.274
4 of p0.156 0.1850.210
5 No.– 0.1550.177
6– –0.157
7– –
Acc. Depth0.5810.856 1.1621.479
Recommended number of passes and radial depth of cut per pass for female NPT thread (60°). Radial depth of cut per pass [mm]
1 2 3 1"2718 1411.5
10.2830.348 0.3900.423
20.2330.287 0.3220.349
3 sses0.2140.263 0.2950.320
4 of pa0.202 0.2260.246
5 No.– 0.1900.207
6– –0.183
7– –
Acc. Depth0.7301.100 1.4231.728