Tapping Solutions

Parlec’s Tapping systems provide superior application with the Numertap® system 770 providing the largest range of tapping. Rigid, tension only or tension and compression systems are standard, along with coolant or coolant groove adapters with up to 6" extension length.


Tapping

Products

Tapping Torque Requirements & Speeds

Tapping speeds are for general purpose taps. Consult tap manufacturer for high geometry taps.

TAPPING SPEEDS
Material Tapping Speed (SFM)
Aluminum 90 - 110
Brass 80 - 100
Bronze 40 - 60
Copper 70 - 90
Copper-Beryllium 40 - 50
Inconel, Hastalloy,Waspalloy 5 - 15
Iron-Cast 65 - 75
ron-Malleable 30 - 60
Magnesium 90 - 110
Plastics 60 - 90
Steel-Cast 30 - 40
Steel-Free Machining 50 - 80
Steel-Chromium 25 - 40
Steel-Alloy 20 - 35
Steel-Stainless 15 - 30
Titanium 10 - 25
Zinc-Die Cast 80 - 120
TORQUE REQUIREMENTS
Tap Size Brass Aluminum & Leaded Brass 200 BHN Steel 300 BHN Steel 400 BHN Steel Approx. Breaking Torque
#6 4 2 7 9 10 8
#8 4.5 2.25 8 10 11 30
#10 8.5 4.25 15 19 21 42
1/4" 16 8 28 36 40 106
5/16" 24 12 42 54 60 180
3/8" 37 18.5 65 83 93 240
7/16" 54 27 94.5 122 135 500
1/2" 68 34 119 153 170 700
9/16" 88 44 154 198 220 850
5/8" 119 59.5 208 268 298 1000
3/4" 170 85 298 383 425 1500
7/8" 238 119 416 536 595 2100
1" 337 168.5 590 758 842 2700
1 1/4" 337 168.5 970 1246 1385 3000+
1 1/2" 850 425 1488 1912 2125 3000+
1 3/4" 1411 706 2471 3177 3530 3000+
2" 1904 952 3332 4284 4760 3000+
2 1/4" 2159 1080 3780 4860 5400 3000+
2 1/2" 2975 1488 5208 6996 7440 3000+
2 - 8" 533 267 933 119 1333 3000+
2 1/2 - 8" 663 332 1160 1492 1658 3000+
3 - 8" 1139 570 1995 2565 2850 3000+
4 - 8" 1411 706 2471 3177 3530 3000+
5 - 8" 1768 884 3094 3978 4420 3000+
6 - 8" 2125 1063 3720 4784 5315 3000+
All values in table above are in inch/lbs. Approximate values based on sharp, 4 Flute coarse pitch hand taps at 65% threat height. Dull taps require approximately 50% more torque. For 55% and 75% threat heights, multiply above values by .75 and 1.25 repectively. Torque values for helical flute taps are approximately 70% of those shown. Torque values for chip drive taps are approximately 60% of those shown. Torque values for fine pitch threads are aproximately 50% of those shown.