Often, I just want to know the closest drill size. Doesn't matter to me if it is fractional, number, letter, or metric. This search occurs often enough that I sat down and found a way that works best for me. Maybe it will help you too.
If you are interested, please see
https://rick.sparber.org/FastAccessD...bleArticle.pdf
Your comments are welcome. All of us are smarter than any one of us.
Thanks,
Rick
Rick
Thanks for that clever technique, Rick. Years ago I made a more conventional chart. Since all the required drill size data was already computerized as part of the work on my webpage, I simply wrote a program to meld all the sizes for all the crazy, inferial drill names with the metric sizes to create a single chart of sequential drill sizes, smallest to largest.
The chart is shown below. Folks who would like a copy can email me and I'll send one along.
Code:Drill Sizes: 97 0.0059 96 0.0063 95 0.0067 94 0.0071 93 0.0075 92 0.0079 91 0.0083 90 0.0087 89 0.0091 88 0.0095 87 0.0100 86 0.0105 85 0.0110 84 0.0115 83 0.0120 82 0.0125 81 0.0130 80 0.0135 79 0.0145 1/64.......... 0.0156 78 0.0160 77 0.0180 76 0.0200 75 0.0210 74 0.0225 73 0.0240 72 0.0250 000-120 71 0.0260 70 0.0280 69 0.0292 68 0.0310 1/32........ 0.0313 0.8 mm 0.0315 67 0.0320 66 0.0330 65 0.0350 0.9 mm 0.0354 64 0.0360 00-90 63 0.0370 62 0.0380 61 0.0390 1.0 mm 0.0394 60 0.0400 59 0.0410 58 0.0420 57 0.0430 1.1 mm 0.0433 56 0.0465 3/64.......... 0.0469 0-80 1.2 mm 0.0472 1.3 mm 0.0512 55 0.0520 54 0.0550 1-56 1.4 mm 0.0551 1.5 mm 0.0591 53 0.0595 1-64,72 1/16...... 0.0625 1.6 mm 0.0630 52 0.0635 1.7 mm 0.0669 51 0.0670 50 0.0700 2-56,64 1.8 mm 0.0709 49 0.0730 1.9 mm 0.0748 48 0.0760 5/64.......... 0.0781 47 0.0785 3-48 2.0 mm 0.0787 46 0.0810 45 0.0820 3-56,4-32 2.1 mm 0.0827 44 0.0860 4-36 2.2 mm 0.0866 43 0.0890 4-40 2.3 mm 0.0906 42 0.0935 4-48 3/32........ 0.0938 2.4 mm 0.0945 41 0.0960 40 0.0980 2.5 mm 0.0984 39 0.0995 38 0.1015 5-40 2.6 mm 0.1024 37 0.1040 5-44 2.7 mm 0.1063 36 0.1065 6-32 7/64.......... 0.1094 35 0.1100 2.8 mm 0.1102 34 0.1110 6-36 33 0.1130 6-40 2.9 mm 0.1142 32 0.1160 3.0 mm 0.1181 31 0.1200 3.1 mm 0.1220 1/8---- 0.1250 3.2 mm 0.1260 30 0.1285 3.3 mm 0.1299 3.4 mm 0.1339 29 0.1360 8-32,36 3.5 mm 0.1378 28 0.1405 8-40 9/64.......... 0.1406 3.6 mm 0.1417 27 0.1440 3.7 mm 0.1457 26 0.1470 25 0.1495 10-24 3.8 mm 0.1496 24 0.1520 3.9 mm 0.1535 23 0.1540 5/32........ 0.1562 22 0.1570 10-30 4.0 mm 0.1575 21 0.1590 10-32 20 0.1610 4.1 mm 0.1614 4.2 mm 0.1654 19 0.1660 4.3 mm 0.1693 18 0.1695 11/64.......... 0.1719 17 0.1730 4.4 mm 0.1732 16 0.1770 12-24 4.5 mm 0.1772 15 0.1800 4.6 mm 0.1811 14 0.1820 12-28 13-4.7 mm 0.1850 12-32 3/16...... 0.1875 12-4.8 mm 0.1890 11 0.1910 4.9 mm 0.1929 10 0.1935 9 0.1960 5.0 mm 0.1969 8 0.1990 5.1 mm 0.2008 7 0.2010 1/4-20 13/64.......... 0.2031 6 0.2040 5.2 mm 0.2047 5 0.2055 5.3 mm 0.2087 4 0.2090 5.4 mm 0.2126 3 0.2130 1/4-28 5.5 mm 0.2165 7/32........ 0.2188 5.6 mm 0.2205 2 0.2210 5.7 mm 0.2244 1 0.2280 5.8 mm 0.2283 5.9 mm 0.2323 A 0.2340 15/64.......... 0.2344 6.0 mm 0.2362 B 0.2380 6.1 mm 0.2402 C 0.2420 6.2 mm 0.2441 D 0.2460 6.3 mm 0.2480 E-1/4 0.2500 6.4 mm 0.2520 6.5 mm 0.2559 F 0.2570 5/16-18 6.6 mm 0.2598 G 0.2610 6.7 mm 0.2638 17/64.......... 0.2656 H 0.2660 6.8 mm 0.2677 6.9 mm 0.2717 I 0.2720 5/16-24 7.0 mm 0.2756 J 0.2770 7.1 mm 0.2795 K 0.2810 9/32........ 0.2812 7.2 mm 0.2835 7.3 mm 0.2874 L 0.2900 7.4 mm 0.2914 M 0.2950 7.5 mm 0.2953 19/64.......... 0.2969 7.6 mm 0.2992 N 0.3020 7.7 mm 0.3031 5/16...... 0.3125 3/8-16 8.0 mm 0.3150 O 0.3160 P 0.3230 21/64.......... 0.3281 Q 0.3320 3/8-24 8.5 mm 0.3346 R 0.3390 11/32........ 0.3438 S 0.3480 9.0 mm 0.3543 T 0.3580 23/64.......... 0.3594 U 0.3680 7/16-14 9.5 mm 0.3740 3/8---- 0.3750 V 0.3770 W 0.3860 25/64.......... 0.3906 7/16-20 10.0 mm 0.3937 X 0.3970 Y 0.4040 13/32........ 0.4062 Z 0.4130 27/64.......... 0.4219 1/2-13 7/16...... 0.4375 29/64.......... 0.4531 1/2-20 15/32........ 0.4688 31/64.......... 0.4844 9/16-12 1/2 0.5000 33/64.......... 0.5156 9/16-18 17/32........ 0.5313 35/64.......... 0.5469 9/16...... 0.5625 37/64.......... 0.5781 19/32........ 0.5938 39/64.......... 0.6094 5/8---- 0.6250 41/64.......... 0.6406 21/32........ 0.6562 43/64.......... 0.6719 11/16...... 0.6875 45/64.......... 0.7031 23/32........ 0.7188 47/64.......... 0.7344 3/4== 0.7500 49/64.......... 0.7656 25/32........ 0.7812 51/64.......... 0.7969 13/16...... 0.8125 53/64.......... 0.8281 27/32........ 0.8438 55/64.......... 0.8594 7/8---- 0.8750 57/64.......... 0.8906 29/32........ 0.9062 59/64.......... 0.9219 15/16...... 0.9375 61/64.......... 0.9531 31/32........ 0.9688 63/64.......... 0.9844 1 in 1.0000 1-3/64.......... 1.0469 1-7/64.......... 1.1094 1-1/8---- 1.1250 1-11/64.......... 1.1719 1-7/32........ 1.2188 1-1/4== 1.2500 1-19/64.......... 1.2969 1-11/32........ 1.3438 1-3/8---- 1.3750 1-27/64.......... 1.4219 1-1/2 1.5000
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Regards, Marv
Failure is just success in progress
That looks about right - Mediocrates
"Thanks for that clever technique, Rick. Years ago I made a more conventional chart. Since all the required drill size data was already computerized as part of the work on my webpage, I simply wrote a program to meld all the sizes for all the crazy, inferial drill names with the metric sizes to create a single chart of sequential drill sizes, smallest to largest."
Marv,
Maybe it is just me, but I'm faster with a two dimensional search than with a linear one.
Just curious, but did you try out my table with a random hole size?
Rick
Rick
PJs (Feb 7, 2019)
Yes, I did and it works well.Originally Posted by rgsparber
Despite many years spent with matrix algebra, my mind remains firmly linear.
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Regards, Marv
Failure is just success in progress
That looks about right - Mediocrates
Rick and Marv,
Great set of tables and I made a similar table for finding the best press fit holes sizes under 1/2" dia. I kept in a clear vinyl sleeve.
However, a few years ago I invested in buying the Calculated Industries Machinist Calc Pro for less than $40 when at sale at Enco. It has an extensive set of calculations and table look-ups. My calculator version is no longer available and they now have a more expensive version that includes specifying the materials to be machined. Nonetheless, I still use the drill size feature the most using the "+" or "-" key to find drill sizes larger or smaller than the exact drill size for press or sliding fits.
I also like the free Android phone apps "Knurling Calculator" and "Machinist Buddy" (has a lot of calculations and reference tables).
Regards,
Paul
PJs (Feb 7, 2019)
My DRILL program from my website does something similar. Below is a sample output hunting a drill to drill a 0.372 hole...
number of drills read from data file = 371
D find Drill designation given hole size
S find hole Size given drill designation
T find Tapdrill for any tap and dot
F find tapdrill for thread-Forming tap
X step drilling calculations
H display this Help/Menu
M display this Help/Menu
Q Quit (Esc also)
(D,S,T,F,X,H,M,Q) ?
{[d].dd or [d-]d/d (e.g. 1.5 or 1-1/2)} Hole Size ? 0.372
(9.25 mm) with size 0.3642 (-0.0078)
(9.30 mm) with size 0.3661 (-0.0059)
(U) with size 0.3680 (-0.0040)
***** (9.40 mm) with size 0.3701 (-0.0019) *****
(9.50 mm) with size 0.3740 (+0.0020)
(3/8) with size 0.3750 (+0.0030)
(V) with size 0.3770 (+0.0050)
(D,S,T,F,X,H,M,Q) ?
---
Regards, Marv
Failure is just success in progress
That looks about right - Mediocrates
Thanks Rick! We've added your Drill Size Table to our Measuring and Marking category, as well as to your builder page: Rick's Homemade Tools. Your receipt:
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