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Cutting Speeds Table #3 Chart

CuttingSpeedsTableNo3Chart.pdf

Table No. 3 – Tapping, MM of one (cast iron)
SIZE SERIES TAP    DRILL 75% RPM @             100 S.F.M. HP @    100 S.F.M. TORQUE IN-LBS.
6-32 UNC .1077 2775 .19 4.4
6-40 UNF .1138 2775 .12 2.9
8-32 UNC .1337 2335 .2 5.4
8-36 UNF .137 2335 .16 4.3
10-24 UNC .149 2016 .35 10.9
10-32 UNF .1597 2016 .2 6.4
12-24 UNC .175 1773 .36 12.6
12-28 UNF .1813 1773 .27 9.5
1/4-20 UNC .2115 1532 .51 21
1/4-28 UNF .2153 1532 .27 11
5/16-18 UNC .2589 1226 .64 33
5/16-24 UNF .2715 1226 .37 19.1
3/8-16 UNC .3144 1021 .82 50
3/8-24 UNF .334 1021 .38 23.3
7/16-14 UNC .3681 875.5 1.1 77
7/16-20 UNF .3890 875.5 .54 39
1/2-13 UNC .4251 766 1.25 102.6
1/2-20 UNF .4515 766 .55 45
9/16-12 UNC .4817 681 1.5 136
9/16-18 UNF .5089 681 .68 62.5
5/8-11 UNC .5365 613 1.75 180
5/8-18 UNF .5714 613 .68 70
3/4-10 UNC .6562 511 2.1 264
3/4-16 UNF .6894 511 .87 107
7/8-9 UNC .7667 438 2.7 382
7/8-14 UNF .8056 438 1.1 163
1″-8 UNC .8781 383 3.4 553
1-12 UNF .9192 383 1.5 253
1 1/8-7 UNC .9857 340 4.4 812
1 1/8-12 UNF 1.0442 340 1.6 286
1 1/4-7 UNC 1.1107 306 4.4 910
1 1/4-12 UNF 1.1692 306 1.6 320
1 3/8-6 UNC 1.2125 279 6 1356
1 3/8-12 UNF 1.2942 279 1.6 353
1 1/2-6 UNC 1.3375 255 6 1489
1 1/2-12 UNF 1.4192 255 1.6 387
1 3/4-5 UNC 1.5552 219 8.7 2496
2″-4 1/2 UNC 1.7836 191 10.7 3530
2 1/4-4 1/2 UNC 2.0336 170 10.8 4005
2 1/2-4 UNC 2.2565 153 13.7 5628
2 3/4-4 UNC 2.5065 139 13.8 6230
3″-4 UNC 2.7565 127 13.8 6831
3 1/4-4 UNC 3.0065 118 13.9 7433
3 1/2-4 UNC 3.2565 109 13.95 8035
3 3/4-4 UNC 3.5065 102 14 8636
4″-4 UNC 3.7565 96 14 9238

 

PIPE TAPS (TAPER)
The following H.P. and Torque specs are based on tapered hole. If hole is straight, multiply by (3) three.
1/8-27 NPT R 948 .54 36
1/4-18 NPT 7/16 706 1.17 103
3/8-18 NPT 37/64 565 1.69 133
1/2-14 NPT 23/32 455 2.00 277
3/4-14 NPT 59/64 364 2.06 356
1-11 1/2 NPT 1 5/32 291 3.07 663
1 1/4-11 1/2 NPT 1 1/2 231 3.48 950
1 1/2-11 1/2 NPT 1 47/64 201 4.08 1280
2-11 1/2 NPT 2 7/32 161 5.31 2080

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