The screw system is definitely not the same as the wire system: smaller screw numbers correspond to smaller screw diameters. Smaller wire numbers mean thicker wire. Why they don't use pecks and rods to measure things I just don't know ;-) Why don't they just say 1mm wire when they mean 1mm wire for instance....these are supposed to be engineers -- oh wait -- I think I know why. /\/\/\/*=Martin ----- Original Message ----- From: "Giles" To: Sent: Monday, February 18, 2002 5:12 PM Subject: Re: [EE]: American standards?? As for screws. 2-56, 4-40, 6-32, ... are screws. The second part stands for threads per inch. So a 4-40 has 40 threads per inch. I don't know what the 1st number means THREAD/SCREW - Drill, Tap, & Clearance Hole Chart Information Machine Screw Size Threads Per Inch Minor Dia Tap Drills Clearance Hole Drills Alum, Brass, & Plasitcs 75% Thread Stainless Steel, Steels & Iron 50% Thread All Materials Close Fit Free Fit # or Dia Major Dia Drill Size Decimal Equiv. Drill Size Decimal Equiv. Drill Size Decimal Equiv. Drill Size Decimal Equiv. 0 .0600 80 .0447 3/64 .0469 55 .0520 52 .0635 50 .0700 1 .0730 64 .0538 53 .0595 1/16 .0625 48 .0760 46 .0810 72 .0560 53 .0595 52 .0635 2 .0860 56 .0641 50 .0700 49 .0730 43 .0890 41 .0960 64 .0668 50 .0700 48 .0760 3 .0990 48 .0734 47 .0785 44 .0860 37 .1040 35 .1100 56 .0771 45 .0820 43 .0890 4 .1120 40 .0813 43 .0890 41 .0960 32 .1160 30 .1285 48 .0864 42 .0935 40 .0980 5 .125 40 .0943 38 .1015 7/64 .1094 30 .1285 29 .1360 44 .0971 37 .1040 35 .1100 6 .138 32 .0997 36 .1065 32 .1160 27 .1440 25 .1495 40 .1073 33 .1130 31 .1200 8 .1640 32 .1257 29 .1360 27 .1440 18 .1695 16 .1770 36 .1299 29 .1360 26 .1470 10 .1900 24 .1389 25 .1495 20 .1610 9 .1960 7 .2010 32 .1517 21 .1590 18 .1695 12 .2160 24 .1649 16 .1770 12 .1890 2 .2210 1 .2280 28 .1722 14 .1820 10 .1935 32 .1777 13 .1850 9 .1960 1/4 .2500 20 .1887 7 .2010 7/32 .2188 F .2570 H .2660 28 .2062 3 .2130 1 .2280 32 .2117 7/32 .2188 1 .2280 5/16 .3125 18 .2443 F .2570 J .2770 P .3230 Q .3320 24 .2614 I .2720 9/32 .2812 32 .2742 9/32 .2812 L .2900 3/8 .3750 16 .2983 5/16 .3125 Q .3320 W .3860 X .3970 24 .3239 Q .3320 S .3480 32 .3367 11/32 .3438 T .3580 7/16 .4375 14 .3499 U .3680 25/64 .3906 29/64 .4531 15/32 .4687 20 .3762 25/64 .3906 13/32 .4062 28 .3937 Y .4040 Z .4130 1/2 .5000 13 .4056 27/64 .4219 29/64 .4531 33/64 .5156 17/32 .5312 20 .4387 29/64 .4531 15/32 .4688 28 .4562 15/32 .4688 15/32 .4688 9/16 .5625 12 .4603 31/64 .4844 33/64 .5156 37/64 .5781 19/32 .5938 18 .4943 33/64 .5156 17/32 .5312 24 .5114 33/64 .5156 17/32 .5312 5/8 .6250 11 .5135 17/32 .5312 9/16 .5625 41/64 .6406 21/32 .6562 18 .5568 37/64 .5781 19/32 .5938 24 .5739 37/64 .5781 19/32 .5938 11/16 .6875 24 .6364 41/64 .6406 21/32 .6562 45/64 .7031 23/32 .6562 3/4 .7500 10 .6273 21/32 .6562 11/16 .6875 49/64 .7656 25/32 .7812 16 .6733 11/16 .6875 45/64 .7031 20 .6887 45/64 .7031 23/32 .7188 13/16 .8125 20 .7512 49/64 .7656 25/32 .7812 53/64 .8281 27/32 .8438 7/8 .8750 9 .7387 49/64 .7656 51/64 .7969 57/64 .8906 29/32 .9062 14 .7874 13/16 .8125 53/64 .8281 20 .8137 53/64 .8281 27/32 .8438 15/16 .9375 20 .8762 57/64 .8906 29/32 .9062 61/64 .9531 31/32 .9688 1 1.000 8 .8466 7/8 .8750 59/64 .9219 1-1/64 1.0156 1-1/32 1.0313 12 .8978 15/16 .9375 61/64 .9531 20 .9387 61/64 .9531 31/32 .9688 1-1/16 1.0625 18 .9943 1.000 1.000 1-1/64 1.0156 1-5/64 1.0781 1-3/32 1.0938 1-1/8 1.1250 7 .9497 63/64 .9844 1-1/32 1.0313 1-9/64 1.1406 1-5/32 1.1562 12 1.0228 1-3/64 1.0469 1-5/64 1.0781 18 1.0568 1-1/16 1.0625 1-5/64 1.0781 1-3/16 1.1875 18 1.1193 1-1/8 1.1250 1-9/64 1.1406 1-13/64 1.2031 1-7/32 1.2188 1-1/4 1.2500 7 1.0747 1-7/64 1.1094 1-5/32 1.1562 1-17/64 1.2656 1-9/32 1.2812 12 1.1478 1-11/64 1.1719 1-13/64 1.2031 18 1.1818 1-3/16 1.1875 1-13/64 1.2031 1-5/16 1.3125 18 1.2443 1-1/4 1.2500 1-17/64 1.2656 1-21/64 1.3281 1-11/32 1.3438 1-3/8 1.3750 6 1.1705 1-7/32 1.2187 1-17/64 1.2656 1-25/64 1.3906 1-13/32 1.4062 12 1.2728 1-19/64 1.2969 1-21/64 1.3281 18 1.3068 1-5/16 1.3125 1-21/64 1.3281 1-7/16 1.4375 18 1.3693 1-3/8 1.3750 1-25/64 1.3906 1-29/64 1.4531 1-15/32 1.4688 1-1/2 1.500 6 1.2955 1-11/32 1.3437 1-25/64 1.3906 1-33/64 1.5156 1-17/32 1.5312 12 1.3978 1-27/64 1.4219 1-7/16 1.4375 18 1.4318 1-7/16 1.4375 1-29/64 1.4531 1-9/16 1.5625 18 1.4943 1-12 1.500 1-33/64 1.5156 1-37/64 1.5781 1-19/32 1.5938 1-5/8 1.625 18 1.5568 1-9/16 1.5625 1-37/64 1.5781 1-41/64 1.6406 1-21/32 1.6562 1-11/16 1.6875 18 1.6193 1-5/8 1.6250 1-41/64 1.6406 1-45/64 1.7031 1-23/32 1.7188 1-3/4 1.750 5 1.5046 1-9/16 1.5625 1-5/8 1.6250 1-49/64 1.7659 1-25/32 1.7812 I can help with drill sizes. The decimal is in inches NUMBER DRILL SIZES No. Decimal equiv. No. Decimal equiv. No. Decimal equiv. No. Decimal equiv. 1 0.2280 21 0.1590 41 0.0960 61 0.0390 2 0.2210 22 0.1570 42 0.0935 62 0.0380 3 0.2130 23 0.1540 43 0.0890 63 0.0370 4 0.2090 24 0.1520 44 0.0860 64 0.0360 5 0.2055 25 0.1495 45 0.0820 65 0.0350 6 0.2040 26 0.1470 46 0.0810 66 0.0330 7 0.2010 27 0.1440 47 0.0785 67 0.0320 8 0.1990 28 0.1405 48 0.0760 68 0.0310 9 0.1960 29 0.1360 49 0.0730 69 0.02925 10 0.1935 30 0.1285 50 0.0700 70 0.0280 11 0.1910 31 0.1200 51 0.0670 71 0.0260 12 0.1890 32 0.1160 52 0.0635 72 0.0250 13 0.1850 33 0.1130 53 0.0595 73 0.0240 14 0.1820 34 0.1110 54 0.0550 74 0.0225 15 0.1800 35 0.1100 55 0.0520 75 0.0210 16 0.1770 36 0.1065 56 0.0465 76 0.0200 17 0.1730 37 0.1040 57 0.0430 77 0.0180 18 0.1695 38 0.1015 58 0.0420 78 0.0160 19 0.1660 39 0.0995 59 0.0410 79 0.0145 20 0.1610 40 0.0980 60 0.0400 80 0.0135 LETTER DRILL SIZES A 0.234 N 0.302 B 0.238 O 0.316 C 0.242 P 0.323 D 0.246 Q 0.331 E 0.250 R 0.339 F 0.257 S 0.348 G 0.261 T 0.358 H 0.266 U 0.368 I 0.272 V 0.377 J 0.277 W 0.386 K 0.281 X 0.397 L 0.290 Y 0.404 M 0.295 Z 0.413 ----- Original Message ----- From: "Tal Bejerano - AMC" To: Sent: Monday, February 18, 2002 2:11 PM Subject: [PICLIST] [EE]: American standards?? > Hi 2 All > > I found many circuits that talking about "#16 wire" or "#8 Screws" "22 gauge > wire". what are this measurements? > where can I find converter for this measurements? > > Thanks > > Tal > > -- > http://www.piclist.com hint: The PICList is archived three different > ways. See http://www.piclist.com/#archives for details. > > > -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details. -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.