Saturday, June24, 2017 L-36.com

Tap and Drill Sizes



THREAD
SIZE
Diameter DRILL
DIAMETER
Coarse Thread
TAP DRILL
SIZE
1-64 .073 .0595 No. 53
2-56 .086 .0700 No. 50
3-48 .099 .0785 No. 47
4-40 .112 .0890 No. 43
5-40 .125 .1015 No. 38
6-32 .138 .1065 No. 36
8-32 .164 .1360 No. 29
10-24 .190 .1495 No. 25
12-24 .216 .1770 No. 16
1/4-20 .250 .2010 No. 7
5/16-18 .313 .2570 'F'
3/8-16 .375 .3125 5/16
7/16-14 .438 .3680 'U'
1/2-13 .500 .4219 27/64
9/16-12 .563 .4844 31/64
5/8-11 .625 .5312 17/32
3/4-10 .750 .6562 21/32
7/8-9 .875 .7656 49/64
1"-8 1.0 .8750 7/8
Fine Thread
0-80 .060 .0469 3/64
1-72 .073 .0595 No. 53
2-64 .086 .0700 No. 50
3-56 .099 .0820 No. 45
4-48 .112 .0935 No. 42
5-44 .125 .1040 No. 37
6-40 .138 .1130 No. 33
8-36 .164 .1360 No. 29
10-32 .190 .1590 No. 21
12-28 .216 .1820 No. 14
1/4-28 .250 .2130 No. 3
5/16-24 .312 .2720 'I'
3/8-24 .375 .3320 'Q'
7/16-20 .4375 .3906 25/64
1/2-20 .500 .4531 29/64
9/16-18 .563 .5156 33/64
5/8-18 .625 .5781 37/64
3/4-16 .750 .6875 11/16
7/8-14 .875 .8125 13/16
1"-14 1.0 .9375 59/64

Fabrication

Tapping and Clearance Drills for Number Machine Screws

Screw Size Tapping Drills Clearance Drills
NumberThreads
/Inch
SeriesNom. Dia. (in) Drill Size
(65-75% thread)
Equivalents Close FitFree Fit
(decimal)(mm) Drill SizeDec. Equiv.Drill SizeDec. Equiv.
000120 0.0340 710.02600.6604 650.0350620.0380
0090 0.0470 650.03500.8890 3/64"0.0469550.0520
080NF0.0600 3/64"0.04691.1913 520.0635500.0700
156NS0.0730 540.05501.3970 480.0760460.0810
64NC 530.05951.5113
72NF 530.05951.5113
256NC0.0860 500.07001.7780 430.0890410.0960
64NF 500.07001.7780
348NC0.0990 470.07851.9939 370.1040350.1100
56NF 450.08202.0828
436NS0.1120 440.08602.1844 320.1160300.1285
40NC 430.08902.2606
48NF 420.09352.3749
540NC 0.1250 380.10152.5781 300.1285290.1360
44NF 370.10402.6416
632NC0.1380 360.10652.7051 270.1440250.1495
36NS 340.11102.8194
40NF 330.11302.8702
832NC0.1640 290.13603.4544 180.1695160.1770
36NF 290.13603.4544
40NS 280.14053.5687
1024NC0.1900 250.14953.7973 90.196070.2010
30NS 220.15703.9878
32NF 210.15904.0386
1224NC0.2160 160.17704.4958 20.221010.2280
28NF 140.18204.6228
32NEF 130.18504.6990
1420NS0.2420 100.19354.9149 D0.2460F0.2570
24NS 70.20105.1054
NumberThreads
/Inch
SeriesNom. Dia. (in) Drill Size
(65-75% thread)
(decimal)(mm) Drill SizeDec. Equiv.Drill SizeDec. Equiv.
Equivalents Close FitFree Fit
Screw Size Tapping Drills Clearance Drills


Notes

Thread Series
National Coarse (NC)
National Fine (NF)
National Extra Fine (NEF)
National Special (NS)

1 inch = 25.4 millimeters

Tap Drill Size (65-75% thread) = Nominal Diameter - One Pitch Length
example:  Tap Drill for #6-32 NC screw is #36, closest drill to 0.1067 inches (0.1067 = 0.1380 - 0.0313)
Nominal Diameter of Number Screw (in.) = (Screw Number x 0.0130) + 0.0600
example:  Nominal Diameter of #6 screw is 0.1380 inches [0.1380 = (6 x 0.0130) + 0.0600]
Pitch (in.) = 1 / (Threads per Inch)
example:  Pitch of 32 threads per inch is 0.0313 inches (0.0313 = 1/32)


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Disclaimer:
The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerious of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.