Page 1818 - All Industrial Tool Supply | General Catalog

Decimal Equivalent Chart
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Decimal equivalenT charT: fracTional, meTric, Wire GaGe & leTTer sizes
deCIMAL deCIMAL deCIMAL deCIMAL deCIMAL deCIMAL deCIMAL
SIZe SIZe SIZe SIZe SIZe SIZe SIZe
INCHeS INCHeS INCHeS INCHeS INCHeS INCHeS INCHeS
#80 0.0135" #55 0.0520" #36 0.1065" #15 0.1800" 6.5mm 0.2559" S 0.3480" 39/64" 0.6094"
.35mm 0.0138 1.35mm 0.0531 2.75mm 0.1083 4.6mm 0.1811 F 0.2570 8.9mm 0.3504 15.5mm 0.6102
#79 0.0145 #54 0.055 7/64" 0.1094 #14 0.1820 6.6mm 0.2598 9mm 0.3543 5/8" 0.6250
1/64" 0.0156 1.4mm 0.0551 #35 0.1100 #13 0.1850 G 0.2610 T 0.3580 16mm 0.6299
.4mm 0.0157 1.45mm 0.0571 2.8mm 0.1102 4.7mm 0.1850 6.7mm 0.2638 9.1mm 0.3583 41/64" 0.6406
#78 0.0160 1.5mm 0.0591 #34 0.1110 4.75mm 0.1870 17/64" 0.2656 23/64" 0.3594 16.5mm 0.6496
.45mm 0.0177 #53 0.0595 #33 0.1130 3/16" 0.1875 6.75mm 0.2657 9.2mm 0.3622 21/32" 0.6562
#77 0.0180 1.55mm 0.0610 2.9mm 0.1142 4.8mm 0.1890 H 0.2660 9.25mm 0.3642 17mm 0.6693
.5mm 0.0197 1/16" 0.0625 #32 0.1160 #12 0.1890 6.8mm 0.2677 9.3mm 0.3661 43/64" 0.6719
#76 0.0200 1.6mm 0.0630 3mm 0.1181 #11 0.1910 6.9mm 0.2717 U 0.3680 11/16" 0.6875
#75 0.0210 #52 0.0635 #31 0.1200 4.9mm 0.1929 I 0.2720 9.4mm 0.3701 17.5mm 0.6890
.55mm 0.0217 1.65mm 0.0650 3.1mm 0.1220 #10 0.1935 7mm 0.2756 9.5mm 0.3740 45/64" 0.7031
#74 0.0225 1.7mm 0.0669 1/8" 0.1250 #9 0.1960 J 0.2770 3/8" 0.3750 18mm 0.7087
.6mm 0.0236 #51 0.0670 3.2mm 0.1260 5mm 0.1969 7.1mm 0.2795 V 0.3770 23/32" 0.7188
#73 0.0240 1.75mm 0.0689 3.25mm 0.1280 #8 0.1990 K 0.2810 9.6mm 0.3780 18.5mm 0.7283
#72 0.0250 #50 0.0700 #30 0.1285 5.1mm 0.2008 9/32" 0.2812 9.7mm 0.3819 47/64" 0.7344
.65mm 0.0256 1.8mm 0.0709 3.3mm 0.1299 #7 0.2010 7.2mm 0.2835 9.75mm 0.3839 19mm 0.7480
#71 0.0260 1.85mm 0.0728 3.4mm 0.1339 13/64" 0.2031 7.25mm 0.2854 9.8mm 0.3858 3/4" 0.7500
.7mm 0.0276 #49 0.0730 #29 0.1360 #6 0.2040 7.3mm 0.2874 W 0.3860 49/64" 0.7656
#70 0.0280 1.9mm 0.0748 3.5mm 0.1378 5.2mm 0.2047 L 0.2900 9.9mm 0.3898 19.5mm 0.7677
#69 0.0292 #48 0.0760 #28 0.1405 #5 0.2055 7.4mm 0.2913 25/64" 0.3906 25/32" 0.7812
.75mm 0.0295 1.95mm 0.0768 9/64" 0.1406 5.25mm 0.2067 M 0.2950 10mm 0.3937 20mm 0.7874
#68 0.0310 5/64" 0.0781 3.6mm 0.1417 5.3mm 0.2087 7.5mm 0.2953 X 0.3970 51/64" 0.7969
1/32" 0.0312 #47 0.0785 #27 0.1440 #4 0.2090 19/64" 0.2969 Y 0.4040 20.5mm 0.8071
.8mm 0.0315 2mm 0.0787 3.7mm 0.1457 5.4mm 0.2126 7.6mm 0.2992 13/32" 0.4062 13/16" 0.8125
#67 0.0320 2.05mm 0.0807 #26 0.1470 #3 0.2130 N 0.3020 Z 0.4130 21mm 0.8268
#66 0.0330 #46 0.0810 3.75mm 0.1476 5.5mm 0.2165 7.7mm 0.3031 10.5mm 0.4134 53/64" 0.8281
.85mm 0.0335 #45 0.0820 #25 0.1495 7/32" 0.2188 7.75mm 0.3051 27/64" 0.4219 27/32" 0.8438
#65 0.0350 2.1mm 0.0827 3.8mm 0.1496 5.6mm 0.2205 7.8mm 0.3071 11mm 0.4331 21.5mm 0.8465
.9mm 0.0354 2.15mm 0.0846 #24 0.1520 #2 0.2210 7.9mm 0.3110 7/16" 0.4375 55/64" 0.8594
#64 0.0360 #44 0.0860 3.9mm 0.1535 5.7mm 0.2244 5/16" 0.3125 11.5mm 0.4528 22mm 0.8661
#63 0.0370 2.2mm 0.0866 #23 0.1540 5.75mm 0.2264 8mm 0.3150 29/64" 0.4531 7/8" 0.8750
.95mm 0.0374 2.25mm 0.0886 5/32" 0.1562 #1 0.2280 O 0.3160 15/32" 0.4688 22.5mm 0.8858
#62 0.0380 #43 0.0890 #22 0.1570 5.8mm 0.2283 8.1mm 0.3189 12mm 0.4724 57/64" 0.8906
#61 0.0390 2.3mm 0.0906 4mm 0.1575 5.9mm 0.2323 8.2mm 0.3228 31/64" 0.4844 23mm 0.9055
1mm 0.0394 2.35mm 0.0925 #21 0.1590 A 0.2340 P 0.3230 12.5mm 0.4921 29/32" 0.9062
#60 0.0400 #42 0.0935 #20 0.1610 15/64" 0.2344 8.25mm 0.3248 1/2" 0.5000 59/64" 0.9219
#59 0.0410 3/32" 0.0938 4.1mm 0.1614 6mm 0.2362 8.3mm 0.3268 13mm 0.5118 23.5mm 0.9252
1.05mm 0.0413 2.4mm 0.0945 4.2mm 0.1654 B 0.2380 21/64" 0.3281 33/64" 0.5156 15/16" 0.9375
#58 0.0420 #41 0.0960 #19 0.1660 6.1mm 0.2402 8.4mm 0.3307 17/32" 0.5312 24mm 0.9449
#57 0.0430 2.45mm 0.0965 4.25mm 0.1673 C 0.2420 Q 0.3320 13.5mm 0.5315 61/64" 0.9531
1.1mm 0.0433 #40 0.0980 4.3mm 0.1693 6.2mm 0.2441 8.5mm 0.3346 35/64" 0.5469 24.5mm 0.9646
1.15mm 0.0453 2.5mm 0.0984 #18 0.1695 D 0.2460 8.6mm 0.3386 14mm 0.5512 31/32" 0.9688
#56 0.0465 #39 0.0995 11/64" 0.1719 6.25mm 0.2461 R 0.3390 9/16" 0.5625 25mm 0.9843
3/64" 0.0469 #38 0.1015 #17 0.1730 6.3mm 0.2480 8.7mm 0.3425 14.5mm 0.5709 63/64" 0.9844
1.2mm 0.0472 2.6mm 0.1024 4.4mm 0.1732 E 0.2500 11/32" 0.3438 37/64" 0.5781 1" 1.0000
1.25mm 0.0492 #37 0.1040 #16 0.1770 1/4" 0.2500 8.75mm 0.3445 15mm 0.5906
1.3mm 0.0512 2.7mm 0.1063 4.5mm 0.1772 6.4mm 0.2520 8.8mm 0.3465 19/32" 0.5938
Tap Drill sizes (75% prob. thread) pipe Tap sizes
TAp drILL TAp drILL TAp drILL TAp drILL SIZe deCIMAL drILL SIZe deCIMAL
SIZe SIZe SIZe SIZe SIZe SIZe SIZe NpT & NpTF (TAper) eQuIVALeNT NpS (STrAIgHT) eQuIVALeNT
#0-80 3/64" #10-32 21 5/8"-18 37/64" 1/8"-27 R .3390" S .3480"
1.6mm x .35 1.25mm 5mm x .8 4.2mm 16mm x 2 14mm 1/4"-18 7/16" .4375 29/64" .4531
#1-64 53 #12-24 16 3/4"-10 21/32" 3/8"-18 37/64 .5781 19/32 .5938
2mm x .4 1.6mm #12-28 14 3/4"-16 11/16" 1/2"-14 23/32 .7188 47/64 .7344
#1-72 53 6mm x 1 5mm 20mm x 2.5 17mm 3/4"-14 59/64 .9219 15/16 .9375
#2-56 51 1/4"-20 7 7/8"-9 49/64" 1"-11-1/2 1-5/32 1.1562 1-3/16 1.1875
#2-64 50 1/4"-28 3 7/8"-14 13/16" 1-1/4"-11-1/2 1-1/2 1.5000 1-33/64 1.5156
2.5mm x .45 2.05mm 5/16"-18 F 24mm x 3 21mm 1-1/2"-11-1/2 1-47/64 1.7344 1-3/4 1.7500
#3-48 47 5/16"-24 I 1"-8 7/8" 2"-11-1/2 2-7/32 2.2188 2-7/32 2.2188
#3-56 45 8mm x 1.25 6.7mm 1"-12 29/32" 2-1/2"-8 2-5/8 2.6250 2-21/32 2.6562
#4-40 43 3/8"-16 5/16" 1"-14 15/16" 3"-8 3-1/4 3.2500 3-9/32 3.2812
#4-48 42 3/8"-24 Q 1-1/8"-7 63/64" 3-1/2"-8 3-3/4 3.7500 3-25/32 3.7812
3mm x .5 2.5mm 10mm x 1.5 8.5mm 1-1/8"-12 1-3/64" 4"-8 4-1/4 4.1250 4-9/32 4.2812
#5-40 38 7/16"-14 U 30mm x 3.5 26.5mm*
#5-44 37 7/16"-20 25/64" 1-1/4"-7 1-7/64"*
3.5mm x .6 2.9mm 12mm x 1.75 10mm 1-1/4"-12 1-11/64"*
#6-32 36 1/2"-13 27/64" 1-3/8"-6 1-3/16"*
#6-40 33 1/2"-20 29/64" 1-3/8"-12 1-9/32"*
4mm x .7 3.3mm 14mm x 2 12mm 36mm x 4 1-1/4"*
#8-32 29 9/16"-12 31/64" 1-1/2"-6 1-11/32"*
#8-36 29 9/16"-18 33/64" 1-1/2"-12 1-27/64"*
#10-24 25 5/8"-11 17/32
*Reaming recommended.