b'TAP DRILL SELECTOR TAP DRILL SELECTORTap Drill Selector TTaap p Drill Drill SelectorSelectorMachine Screw/Fractional Machine Screw/Fractional(cont) MetricDecimal Decimal Decimal DecimalDecimal DecimalTap Equivalent Theoretical Probable Tap Equivalent Theoretical Probable Tap Equivalent Theoretical Probable Tap Equivalent Theoretical ProbableTap Equivalent Theoretical Probable Tap Equivalent Theoretical ProbableTap Drill of Tap Drill Percent of Percent Tap Drill of Tap Drill Percent of Percent Tap Drill of of Tap Tap DrillDrill PercentPercent Tap Drill of of Tap Tap DrillDrill PercentPercentTap Drill Percent ofof Percent Tap Drill Percent ofof PercentSize Size (Inches) Thread of Thread Size Size (Inches) Thread of Thread Size Size (Inches) Thread of of Thread Size Size (Inches) Thread of of ThreadSize Size (Inches) Thread Thread Size Size (Inches) Thread Thread080 56 .0465 83 74 832 3.40 mm .1339 74 679/1612 15/32 .4688 8787 8282 MM1.16. 6xx0 .03.5351.12.02 0m mmm .0.4074272 8888 80809/1612 15/32 .468831/64 .48443/64 .0469 81 71 29 .1360 69 62 31/64 .4844 7272 6868 1.12.52 5m mmm .0.4094292 7777 69691.20 mm .0472 79 69 9/1618 1/2 .5000 8787 8080 MM2 2xx0 .04.040 1/11/616 .0.6026525 7979 7272836 29 .1360 78 709/1618 1/2 .50001.25 mm .0492 67 57 5/811 17/32 .5313 7979 7575 1.16.06 0m mmm .0.6036030 7777 69693.50 mm .1378 72 65 5/811 17/32 .53135/818 9/16 .5625 8787 8080 5252 .0.6036535 7474 6666164 54m .0550 89 81 1024 27 .1440 85 795/818 9/16 .56251.45 mm .0571 78 71 3/410 41/64 .6406 8484 8080 MM2.25. 5xx0 .04.5452.20.50 5m mmm .0.8008707 7777 69693.70 mm .1457 82 76 3/410 41/64 .640653 .0595 67 59 21/32 .6563 7272 6868 4646 .0.8018010 7676 676726 .1470 79 74 21/32 .6563172 1.50 mm .0591 77 68 25 .1495 75 69 3/416 11/16 .6875 7777 7171 4545 .0.8028020 7171 63633/416 11/16 .687517.50 mmmm .689053 .0595 75 67 24 .1520 70 64 17.50.6890 7575 6969 MM3 3xx0 .05.050 4040 .0.9089080 7979 70701.55 mm .0610 67 68 7/89 49/64 .7656 7676 7272 2.25.05 0m mmm .0.9089484 7777 68681032 5/32 .1563 83 757/89 49/64 .7656 3939 .0.9099595 7373 64647/814 51/64 .7969 8484 7979256 51 .0670 82 74 22 .1570 81 73 7/814 51/64 .79691.75 mm .0689 73 66 21.1590 76 68 1"8 55/64 .8594 8787 8383 MM3.35. 5xx0 .06.0603333 .1.1131030 8181 72721"8 55/64 .8594 2.29.09 0m mmm .1.1141242 7777 686850 .0700 69 62 7/8 .8750 7777 73731224 11/64 .1719 82 757/8 .8750 3232 .1.1161060 7171 63631.80 mm .0709 65 58 17 .1730 79 731"12 29/32 .9063 8787 81811"12 29/32 .9063 MM4 4xx0 .07.070 3.32.02 0m mmm .1.2162060 8888 8080264 50 .0700 79 70 16 .1770 72 66 59/64 .9219 7272 676759/64 .9219 3030 .1.2182585 8181 73731.80 mm .0709 74 66 1"14 59/64 .9219 8484 7878 3.33.03 0m mmm .1.2192999 7777 69691228 16 .1770 84 771"14 59/64 .921949 .0730 64 56 1-1/87 31/32 .9688 8484 818115 .1800 78 70 1-1/87 31/32 .9688 MM4.45. 5xx0 .07.5753.37.07 0m mmm .1.4154757 8282 747463/64 .9844 7676 7272348 48 .0760 85 784.60 mm .1811 75 67 63/64 .9844 2626 .1.4174070 7979 70705/64 .0781 77 7014 .1820 73 66 1-1/812 1.0313 8787 8080 2525 .1.4194595 7272 64641-1/8121-1/321-1/32 1.031347 .0785 76 691-1/47 1-3/32 1.0938 8484 **1/420 9 .1960 83 77 1-1/47 1-3/32 1.0938 MM5 5xx0 .08.080 4.42.02 0m mmm .1.6156454 7777 69692.00 mm .0787 75 681-7/64 1.1094 7676 **8 .1990 79 73 1-7/64 1.1094 1919 .1.6166060 7575 686846 .0810 67 607 .2010 75 70 1-1/412 1.1719 7272 **1-1/4121-11/641-11/64 1.171945 .0820 63 561-3/86 1-13/64 1.20317979 ** MM6 6xx1 .10.000 1010 .1.9139535 8484 767613/64 .2031 72 66 1-3/86 1-13/64 1.203199 .1.9169060 7979 71711-7/32 1.2188 7272 **356 46 .0810 78 691/428 5.40 mm .2126 81 72 1-7/32 1.2188 5.50.00 0m mmm .1.9169868 7777 707045 .0820 73 651-3/8121.2969 7272 ** 88 .1.9199090 7373 65653 .2130 80 72 1-3/812 1-19/641-19/64 1.29692.10 mm .0827 70 621-1/26 1-21/64 1.32817979 **1-1/26 1-21/64 1.3281MM7 7xx1 .10.000 AA .2.3243040 8181 74742.15 mm .0846 62 545/1618 F .2570 77 72 1-11/32 1.3438 7272 **6.60 mm .2598 73 68 1-11/32 1.3438 6.60.00 0m mmm .2.3263262 7777 7070440 44 .0860 80 741-1/212 1-27/64 1.4219 7272 ** BB .2.3283080 7474 6666G .2610 71 66 1-1/212 1-27/64 1.42192.20 mm .0866 78 72*Reaming recommended MM8 8xx1 .12.525 6.67.07 0m mmm .2.6236838 8080 747443 .0890 71 655/1624 H .2660 86 78 171/76/464 .2.6256656 7777 71712.30 mm .0906 66 60 6.80 mm .2677 83 75 Tapping Speeds HH .2.6266060 7777 7070448 2.35 mm .0925 72 72 I .2720 75 67 Propertappingspeedsareveryimportantinobtainingefficient 6.68.08 0m mmm .2.6276777 7474 686842 .0935 68 613/816 7.80 mm .3071 84 78 tapping results. The optimum speed for tapping is the highestM108.40.3307 8282 7676M10 x x 1.501.50 8.40 mmmm .33073/32 .0938 68 607.90 mm .3110 79 73 speed that conditions permit, consistent with acceptable tool life.QQ .3320 8080 7575.33202.40 mm .0945 65 57 5/16 .3125 77 72 Speeds must be lowered as the length of the hole increases. In8.50.3346 7777 7171O .3160 73 68 short holes, taps with tapered chamfers can be operated faster8.50 mmmm .3346540 40 .0980 83 76M1210.25.4035 7777 7272M12 x x 1.751.75 10.25 mmmm .403539 .0995 79 713/824 21/64 .3281 87 79 than taps with bottoming chamfers. Speeds can be increasedYY .4040 7676 7171.404038 .1015 72 658.40 mm .3307 82 74 when vertical tapping, as compared to horizontal tapping. 13/32 .4062 7474 696913/32 .40622.60 mm .1024 70 63 Q .3320 79 71 M1415/32 .4688 8181 76768.50 mm .3346 75 67 The chart below suggests a starting point for selecting the speedM14 x x 2.002.00 15/32 .468812.00.4724 7777 7272544 38 .1015 79 72to operate the tap. 12.00 mmmm .47242.60 mm .1024 77 697/1614 T .3580 86 81 M1635/64 .5469 8181 7676M16 x x 2.002.00 35/64 .546937 .1040 71 63 23/64 .3594 84 79 14.00.5512 7777 72729.20 mm .3622 81 76 Tapping Speed Selector 14.00 mmmm .5512632 37 .1040 84 78Speed Speed M2011/16 .6875 7878 74749.30 mm .3661 77 72 M20 x x 2.502.50 11/16 .687517.50.6890 7777 737336 .1065 78 72U .3680 75 70 Material (feet/min) Material (feet/min) 17.50 mmmm .68907/64 .1095 70 64M2413/16 .8125 8686 82829.40 mm .3701 73 68 Aluminum, Soft90-110Nuts, Cold Formed60-80M24 x x 3.003.00 13/16 .812535 .1100 69 6321.00.8268 7676 737321.00 mmmm .826834 .1110 67 60 7/1620 W .3860 79 72 Aluminum, Alloy80-100Plastics60-8053/64 .8281 7676 737325/64 .3906 72 65 Brass, Soft 90-110Rubber, Hard80-10053/64 .8281640 34 .1110 83 75 M30 x x 3.503.50 1-1/32 1.0312Brass, Hard40-60Screw Stock65-90M301-1/32 1.0312 8383 808033 .1130 77 69 1/213 10.50 mm .4134 87 82 Bronze, Soft40-70Steel, Alloy Grades15-3526.501.0433 7777 737326.50 mmmm 1.0433GENERAL TOOLINFORMATIONBronze, Hard 30-50Steel, Cast20-351-3/64 1.0469 7575 70702.90 mm .1142 73 65 27/64 .4219 78 73 1-3/64 1.0469 INFORMATION GENERAL TOOL 32 .1160 68 60 Copper50-60Steel, Stainless15-30M361-17/64 1.2656 74741/220 29/64 .4531 72 65 M36 x x 4.004.00 1-17/64 1.2656Die Castings 60-80Steel, Tool Grades25-40 *ReamingRecommended*Reaming RecommendedIron, Cast70-100 800-942-1501 www.triumphtwistdrill.comwww.triumphtwistdrill.com800-942-150164 65'