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Text of the page (random words):
e within at most 10 of an arbitrary hole size the price and availability of particular size bits does not change uniformly across the size range bits at size increments of 1 mm are most commonly available and lowest price sets of bits in 1 mm increments might be found on a market stall in 0 5 mm increments any hardware store in 0 1 mm increments any engineers store sets are not commonly available in smaller size increments except for drill bits below 1 mm diameter drill bits of the less routinely used sizes such as 2 55 mm would have to be ordered from a specialist drill bit supplier this subsetting of standard sizes is in contrast to general practice with number gauge drill bits where it is rare to find a set on the market which does not contain every gauge there are also renard series sequences of preferred metric drill bits 1 r5 factor 1 58 m2 5 m4 m6 m10 m16 m24 r10 factor 1 26 m3 m5 m8 m12 m20 m30 metric dimensioning is routinely used for drill bits of all types although the details of bs 328 apply only to twist drill bits for example a set of forstner bits may contain 10 15 20 25 and 30 mm diameter cutters fractional inch drill bit sizes edit fractional drill bit set by craftsman fractional inch drill bit sizes are still in common use in the united states and in any factory around the globe that makes inch sized products for the u s market ansi b94 11m 1979 sets size standards for jobber length straight shank twist drill bits from 1 64 inch through 1 inch in 1 64 inch increments for morse taper shank drill bits the standard continues in 1 64 inch increments up to 1 3 4 inches then 1 32 inch increments up to 2 1 4 inches 1 16 inch increments up to 3 inches 1 8 inch increments up to 3 1 4 inches and a single 1 4 inch increment to 3 1 2 inches one aspect of this method of sizing is that the size increment between drill bits becomes larger as bit sizes get smaller 100 for the step from 1 64 to 1 32 but a much smaller percentage between 1 47 64 and 1 3 4 drill bit sizes are written as irreducible fractions so instead of 78 64 inches or 1 14 64 inches the size is noted as 1 7 32 inches below is a chart providing the decimal fraction equivalents that are most relevant to fractional inch drill bit sizes that is 0 to 1 by 64ths decimal places for 25 5 and 75 are shown to thousandths 250 500 750 which is how machinists usually think about them two fifty five hundred seven fifty machinists generally truncate the decimals after thousandths for example a 27 64 inch drill bit may be referred to in shop floor speech as a four twenty one drill decimal fraction equivalents edit decimal fraction equivalents fraction in mm 1 64 0 015625 0 396875 1 32 0 03125 0 79375 3 64 0 046875 1 190625 1 16 0 0625 1 5875 5 64 0 078125 1 984375 3 32 0 09375 2 38125 7 64 0 109375 2 778125 1 8 0 125 3 175 9 64 0 140625 3 571875 5 32 0 15625 3 96875 11 64 0 171875 4 365625 3 16 0 1875 4 7625 13 64 0 203125 5 159375 7 32 0 21875 5 55625 15 64 0 234375 5 953125 1 4 0 250 6 350 fraction in mm 17 64 0 265625 6 746875 9 32 0 28125 7 14375 19 64 0 296875 7 540625 5 16 0 3125 7 9375 21 64 0 328125 8 334375 11 32 0 34375 8 73125 23 64 0 359375 9 128125 3 8 0 375 9 525 25 64 0 390625 9 921875 13 32 0 40625 10 31875 27 64 0 421875 10 715625 7 16 0 4375 11 1125 29 64 0 453125 11 509375 15 32 0 46875 11 90625 31 64 0 484375 12 303125 1 2 0 500 12 700 fraction in mm 33 64 0 515625 13 096875 17 32 0 53125 13 49375 35 64 0 546875 13 890625 9 16 0 5625 14 2875 37 64 0 578125 14 684375 19 32 0 59375 15 08125 39 64 0 609375 15 478125 5 8 0 625 15 875 41 64 0 640625 16 271875 21 32 0 65625 16 66875 43 64 0 671875 17 065625 11 16 0 6875 17 4625 45 64 0 703125 17 859375 23 32 0 71875 18 25625 47 64 0 734375 18 653125 3 4 0 750 19 050 fraction in mm 49 64 0 765625 19 446875 25 32 0 78125 19 84375 51 64 0 796875 20 240625 13 16 0 8125 20 6375 53 64 0 828125 21 034375 27 32 0 84375 21 43125 55 64 0 859375 21 828125 7 8 0 875 22 225 57 64 0 890625 22 621875 29 32 0 90625 23 01875 59 64 0 921875 23 415625 15 16 0 9375 23 8125 61 64 0 953125 24 209375 31 32 0 96875 24 60625 63 64 0 984375 25 003125 1 1 000 25 400 number and letter gauge drill bit sizes edit a 80 drill bit number drill bit gauge sizes range from size 80 the smallest to size 1 the largest followed by letter gauge size a the smallest to size z the largest although the asme b94 11m twist drill standard for example lists sizes as small as size 97 sizes smaller than 80 are rarely encountered in practice number and letter sizes are commonly used for twist drill bits rather than other drill forms as the range encompasses the sizes for which twist drill bits are most often used the gauge to diameter ratio is not defined by a formula it is based on but is not identical to the stubs steel wire gauge which originated in britain during the 19th century 2 the accompanying graph illustrates the change in diameter with change in gauge as well as the reduction in step size as the gauge size decreases each step along the horizontal axis is one gauge size number and letter gauge drill bits are still in common use in the u s and to a lesser extent the uk where they have largely been supplanted by metric sizes other countries that formerly used the number series have for the most part also abandoned these in favour of metric sizes citation needed drill bit conversion table edit click to see a ruler comparing millimeters to fractions of an inch see also drill and tap size chart gauge in mm 104 0 0031 0 079 103 0 0035 0 089 102 0 0039 0 099 101 0 0043 0 109 100 0 0047 0 119 99 0 0051 0 130 98 0 0055 0 140 97 0 0059 0 150 96 0 0063 0 160 95 0 0067 0 170 94 0 0071 0 180 93 0 0075 0 191 92 0 0079 0 201 91 0 0083 0 211 90 0 0087 0 221 89 0 0091 0 231 88 0 0095 0 241 87 0 010 0 254 86 0 0105 0 267 85 0 011 0 279 84 0 0115 0 292 83 0 012 0 305 82 0 0125 0 318 81 0 013 0 330 80 0 0135 0 343 79 0 0145 0 368 gauge in mm 78 0 016 0 406 77 0 018 0 457 76 0 020 0 508 75 0 021 0 533 74 0 0225 0 572 73 0 024 0 610 72 0 025 0 635 71 0 026 0 660 70 0 028 0 711 69 0 0292 0 742 68 0 031 0 787 67 0 032 0 813 66 0 033 0 838 65 0 035 0 889 64 0 036 0 914 63 0 037 0 940 62 0 038 0 965 61 0 039 0 991 60 0 040 1 016 59 0 041 1 041 58 0 042 1 067 57 0 043 1 092 56 0 0465 1 181 55 0 052 1 321 54 0 055 1 397 53 0 0595 1 511 gauge in mm 52 0 0635 1 613 51 0 067 1 702 50 0 070 1 778 49 0 073 1 854 48 0 076 1 930 47 0 0785 1 994 46 0 081 2 057 45 0 082 2 083 44 0 086 2 184 43 0 089 2 261 42 0 0935 2 375 41 0 096 2 438 40 0 098 2 489 39 0 0995 2 527 38 0 1015 2 578 37 0 104 2 642 36 0 1065 2 705 35 0 110 2 794 34 0 111 2 819 33 0 113 2 870 32 0 116 2 946 31 0 120 3 048 30 0 1285 3 264 29 0 136 3 454 28 0 1405 3 569 27 0 144 3 658 gauge in mm 26 0 147 3 734 25 0 1495 3 797 24 0 152 3 861 23 0 154 3 912 22 0 157 3 988 21 0 159 4 039 20 0 161 4 089 19 0 166 4 216 18 0 1695 4 305 17 0 173 4 394 16 0 177 4 496 15 0 180 4 572 14 0 182 4 623 13 0 185 4 699 12 0 189 4 801 11 0 191 4 851 10 0 1935 4 915 9 0 196 4 978 8 0 199 5 055 7 0 201 5 105 6 0 204 5 182 5 0 2055 5 220 4 0 209 5 309 3 0 213 5 410 2 0 221 5 613 1 0 228 5 791 gauge in mm a 0 234 5 944 b 0 238 6 045 c 0 242 6 147 d 0 246 6 248 e 0 250 6 350 f 0 257 6 528 g 0 261 6 629 h 0 266 6 756 i 0 272 6 909 j 0 277 7 036 k 0 281 7 137 l 0 290 7 366 m 0 295 7 493 n 0 302 7 671 o 0 316 8 026 p 0 323 8 204 q 0 332 8 433 r 0 339 8 611 s 0 348 8 839 t 0 358 9 093 u 0 368 9 347 v 0 377 9 576 w 0 386 9 804 x 0 397 10 08 y 0 404 10 26 z 0 413 10 49 screw machine length drill edit the shortest standard length drills that is lowest length to diameter ratio are screw machine length drills sometimes abbreviated s m they are named for their use in screw machines their shorter flute length and shorter overall length compared to a standard jobber bit results in a more rigid drill bit reducing deflection and breakage they are rarely available in retail hardware stores or home centers types of drill bits edit twist drills most common general purpose drilling brad point woodworking precise holes spade bits fast rough holes in wood forstner bits clean flat bottom holes step bits multiple diameter holes 3 jobber length drill edit jobber length drills are the most commonly found type of drill the length of the flutes is between 9 and 14 times the diameter of the drill depending on the drill size so a 1 2 in 12 7 mm diameter drill will be able to drill a hole 4 1 2 in 114 3 mm deep since it is 9 times the diameter in length a 1 8 in 3 175 mm diameter drill can drill a hole 1 5 8 in 41 275 mm deep since it is 13 times the diameter in flute length 4 the term jobber refers to a wholesale distributor a person or company that buys from manufacturers and sells to retailers citation needed manufacturers producing drill bits for the trade as opposed to for specialized machining applications with particular length and design requirements made ones of medium length suitable for a wide variety of jobs because that was the type most desirable for general distribution thus at the time that the name of jobber length drill bits became common it reflected the same concept that names like general purpose and multipurpose reflect citation needed aircraft length drill edit extended reach or long series drills are commonly called aircraft length from their original use in manufacturing riveted aluminum aircraft for bits thicker than a minimum size such as 1 8 inch 3 2 mm they are available in fixed lengths such as 6 8 12 or 18 inches 152 203 305 or 457 mm rather than the progressive lengths of jobber drills 11 32 inch drills long series morse plain morse jobber the image shows a long series drill compared to its diametric equivalents all are 11 32 inch 8 7 mm in diameter the equivalent morse taper drill shown in the middle is of the usual length for a taper shank drill the lower drill bit is the jobber or parallel shank equivalent center drill bit sizes edit center drills numbers 1 bottom through to 6 top center drills are available with two different included angles 60 degrees is the standard for drilling centre holes for example for subsequent centre support in the lathe but 90 degrees is also common and used when locating holes prior to drilling with twist drills center drills are made specifically for drilling lathe centers but are often used as spotting drills because of their radial stiffness size designation drill diameter 5 0 0 010 in 0 254 mm 4 0 0 015 in 0 381 mm 3 0 0 020 in 0 508 mm 2 0 0 025 in 0 635 mm 0 1 32 in 0 794 mm 1 3 64 in 1 191 mm 2 5 64 in 1 984 mm 3 7 64 in 2 778 mm 4 1 8 in 3 175 mm 4½ 9 64 in 3 572 mm 5 3 16 in 4 763 mm 6 7 32 in 5 556 mm 7 1 4 in 6 350 mm 8 5 16 in 7 938 mm gauge body diameter bs1 1 8 in 3 175 mm bs2 3 16 in 4 763 mm bs3 1 4 in 6 350 mm bs4 5 16 in 7 938 mm bs5 7 16 in 11 113 mm bs5a 1 2 in 12 700 mm bs6 5 8 in 15 875 mm bs7 3 4 in 19 050 mm spotting drill bit sizes edit spotting drills are available in a relatively small range of sizes both metric and imperial as their purpose is to provide a precise spot for guiding a standard twist drill commonly available sizes are 1 8 1 4 3 8 1 2 5 8 3 4 4 mm 6 mm 8 mm 10 mm 12 mm 14 mm 16 mm and 18 mm the drills are most ordinarily available with either 90 or 120 included angle points references edit dasarathi cadem 2 february 2017 preferred sizes in engineering cnc etc retrieved 6 september 2017 pöll j s june 1999 the story of the gauge anaesthesia 54 6 575 581 doi 10 1046 j 1365 2044 1999 00895 x issn 0003 2409 pmid 10403873 s2cid 41519791 drillbitcalculator com drillbitcalculator com drill bit calculator retrieved 2025 11 13 jobber length twist drill sizes v t e metalworking v t e machining and computing computer aided engineering 2 5d cad cam g code numerical control nc and cnc stewart platform drilling and threading die head drill drill bit drill bit shank drill bit sizes drilling list of drill and tap sizes tap and die tap wrench threading grinding and lapping abrasive abrasive machining angle grinder bench grinder coated abrasive cylindrical grinder diamond plate flick grinder grinding grinding dresser grinding machine grinding wheel jig grinder lapping sanding sharpening stone spark testing surface grinder tool and cutter grinder machining boring broaching electrical discharge machining electrochemical machining electron beam machining end mill engraving facing hobbing jig borer machine tool machining metal lathe milling milling cutter pantograph photochemical machining planer reamer rotary transfer machine shaper skiving turning ultrasonic machining machine tools angle plate chuck collet fixture indexing head jig lathe center machine taper magnetic switchable device mandrel rotary table wiggler terminology cutting fluid machining vibrations speeds and feeds swarf tolerance tool and die making tramp oil workpiece casting fabrication forming jewellery machining metallurgy smithing tools and terminology welding v t e woodworking overviews history glossary wood lumber styles boat building bow and arrow bush carpentry cabinetry caning carpentry certosina chainsaw carving chip carving ébéniste fretwork intarsia japanese carpentry khatam kohlrosing log building luthier marquetry millwork pallet crafting parquetry pyrography relief carving root carving segmented turning shingle weaving shipbuilding spindle turning timber framing treen whittling wood carving woodturning woods soft cedar calocedrus cedrus cypress douglas fir fir juniper larch kauri pine rimu spruce yew hard afromosia alder andiroba anigre ash apple aspen avodire balsa beech bilinga birch african blackwood australian blackwood boxwood bubinga camphor cedrela cherry chestnut cocobolo cumaru ebony elm eucalyptus hazel hickory hornbeam idigbo imbuia ipê iroko jarrah jelutong lignum vitae linden lime basswood lovoa merbau mahogany american african maple meranti oak padauk pear plum poplar purpleheart ovankol ramin red quebracho rosewood rubberwood sapele teak totara utile walnut wenge willow zebrano engineered cross laminated glue laminated hardboard mdf osb particle board plywood wood plastic composite tools abrasives axe adze burnisher chisel drawknife drill fence float gimlet gauge hinge bender impact driver janka hardness test jointer mallet milling machine miter box rasp router sandpaper shaper shaving horse square carpenters combination miter speed try thickness planer timber framing veneer hammer vise warrington hammer winding sticks wood scribe workbench clamps band clamp c clamp f clamp flooring clamp gripe holdfast miter clamp pipe clamp sawbuck saws backsaw bandsaw bow bucksaw chainsaw circular compass coping crosscut frame fretsaw hand saw jigsaw keyhole miter ripsaw scroll table veneer whipsaw planes bedrock plane block plane chamfer plane compass plane finger plane fore plane grooving plane jack plane japanese plane jointer plane moulding plane razee plane rebate plane router plane scrub plane shoulder plane smoothing plane spokeshave surform geometry joints birdsmouth biscuit box bridle bu...