Visit Our Online Store



Check us out on YouTube



  

Tap Drill Chart

Tap
Size
Thread Pitch Drill Size     Aluminum     Mild Steel /
    Cast Iron**    
Stainless Steel
N.C. N.F. Cut Thd. Roll Thd. RPM* HP RPM* HP RPM* HP
#0   80 3/64" #54 3000 1/16 2000 1/16 1270 1/8
#2 56   #50 5/64" 3000 1/16 2000 1/16 750 1/8
#4 40   #43 #39 3000 1/16 2000 1/8 580 1/4
#6 32   #34 1/8" 3000 1/16 1870 1/8 470 1/4
#8 32   #29 #25 3000 1/16 1560 1/8 390 1/4
#10 24   #23 11/64" 1700 1/8 1360 1/4 340 1/3
#10   32 #20 #16 1800 1/8 1600 1/4 400 1/2
1/4" 20   #6 #1 1600 1/4 800 1/3 200 1/2
1/4"   28 #3 A 1800 1/4 1200 1/4 300 1/3
5/16" 18   G 7.3mm 1260 1/4 640 1/3 160 3/4
5/16"   24 I M 1500 1/4 960 1/3 240 1/2
3/8" 16   O S 1050 1/4 530 1/2 130 1
3/8"   24 R T 1300 1/4 800 1/2 200 3/4
7/16" 14   3/8" 13/32" 1200 1/3 450 3/4 110 1
1/2" 13   27/64" 15/32" 800 1/3 400 3/4 100 1
1/2"   20 29/64" 31/64" 1200 1/3 600 3/4 150 3/4
5/8" 11   17/32" 15.0mm 640 1/2 320 1 80 1-1/2
5/8"   18 37/64" 19/32" 975 1/2 490 3/4 120 1
3/4" 10   21/32" 45/64" 540 1/2 266 1 66 2
3/4"   16 11/16" 23/32" 815 1/2 405 1 100 1-1/2
7/8" 9   49/64" -- 460 3/4 230 1-1/2 56 2
1" 8   7/8" -- 400 3/4 200 1-1/2 50 3
1/16"NPT 27   D -- 1500 1/8 1025 1/4 380 1/3
1/8"NPT 27   R -- 1200 1/4 900 1/2 300 1/2
1/4"NPT 18   7/16" -- 1000 1/2 600 3/4 250 1
3/8"NPT 18   37/64" -- 700 3/4 350 1 150 1-1/2
1/2"NPT 14   23/32" -- 500 1 250 1-1/2 90 2
3/4"NPT 14   59/64" -- 350 1-1/2 175 2 50 3
Note: Pipe tap drill size without taper pipe reamer.
* RPM not to exceed maximum of tapping head.
** SAE 1020 / 1112, Hardness: 217 BHN / 20 Rc

 

Contact us for more information


   Our Product Lines:
  Speedycut Logo
CREATECH