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DECIMAL INCH / METRIC EQUIVALENTS
(PLUS TAP / DRILL / PILOT RECOMMENDATIONS)
USS & SAE
TAP SIZES
DRILL

INCH EQ.

METRIC EQ.

ALL TAP, DRILL
& PILOT SIZES

  #80 .0135"  .3429 mm  
  #79 .0145"  .3683 mm  
1/64" .015625"  .3969 mm #0 Pilot in Soft-Wood
  #78 .016"  .4064 mm  
  #77 .018"  .4572 mm  
    .0197"  .5000 mm  
  #76 .02"  .5080 mm  
  #75 .021"  .5334 mm  
  #74 .0225"  .5715 mm  
  #73 .024"  .6096 mm  
  #72 .025"  .6350 mm  
  #71 .026"  .6604 mm  
  #70 .028"  .7112 mm  
  #69 .0292"  .7416 mm  
    .0295"  .7500 mm M1x.25 coarse
  #68 .031"  .7874 mm  
1/32" .03125"  .7938 mm #0 Pilot, Hard-Wood 
#1 Pilot, Hard & Soft-Wood
#2 Pilot, Soft-Wood
  #67 .032"  .8128 mm  
  #66 .033"  .8382 mm  
    .0335"  .8500 mm M1.1x.25 coarse
  #65 .035"  .8890 mm  
  #64 .036"  .9144 mm  
  #63 .037"  .9398 mm  
    .0374"  .9500 mm M1.2x.25 coarse
  #62 .038"  .9652 mm  
  #61 .039"  .9906 mm  
    .0394" 1.0000 mm  
  #60 .04" 1.0160 mm  
  #59 .041" 1.0414 mm  
  #58 .042" 1.0668 mm  
  #57 .043" 1.0922 mm  
    .0433" 1.1000 mm M1.4x.3 coarse
  #56 .0465" 1.1811 mm  
#0-80 UNF  3/64" .046875" 1.1906 mm #0-80 UNF 
#2 Pilot, Hard-wood 
#3 Pilot, Soft-Wood 
#4 Pilot, Soft-Wood
    .0492" 1.2500 mm M1.6x.35 coarse
    .0512" 1.3000 mm M1.7x.35 coarse
  #55 .052" 1.3208 mm  
  #54 .055" 1.3970 mm  
    .0571" 1.4500 mm M1.8x.35 coarse
    .0591" 1.5000 mm  
#1-64 UNC 
#1-72 UNF
#53 .0595" 1.5113 mm #1-64 UNC #1-72 UNF
1/16" .0625" 1.5875 mm #0 Wood Shank Hole 
#3 Pilot, Hard-Wood 
#4 Pilot, Hard-wood 
#5 Pilot, Soft-wood 
#6 Pilot, Soft-wood 
#7 Pilot, Soft-wood
    .063" 1.6000 mm M2x.4 coarse
  #52 .0635" 1.6129 mm  
  #51 .067" 1.7018 mm  
    .0689" 1.7500 mm M2.2x.45 coarse
#2-64 UNF 
#2-56 UNC
#50 .07" 1.7780 mm #2-64 UNF #2-56 UNC
  #49 .073" 1.8542 mm  
  #48 .076" 1.9304 mm  
5/64" .078125" 1.9844 mm #1 Wood Shank Hole 
#5 Pilot, Hard-wood 
#6 Pilot, Hard-wood 
#8 Pilot, Soft-wood 
#9 Pilot, Soft-wood
#3-48 UNC #47 .0785" 1.9939 mm #3-48 UNC
    .0787" 2.0000 mm  
    .0807" 2.0500 mm M2.5x.45 coarse
  #46 .081" 2.0574 mm  
#3-56 UNF #45 .082" 2.0828 mm #3-56 UNF
  #44 .086" 2.1844 mm  
#4-40 UNC #43 .089" 2.2606 mm #4-40 UNC
#4-48 UNF #42 .0935" 2.3749 mm #4-48 UNF
3/32" .09375" 2.3813 mm #2 Wood Shank Hole 
#7 Pilot, Hard-wood 
#8 Pilot, Hard-wood 
#10 Pilot, Soft-wood 
#11 Pilot, Soft-wood
  #41 .096" 2.4384 mm  
  #40 .098" 2.4892 mm  
    .0984" 2.5000 mm M3x.5 coarse
  #39 .0995" 2.5273 mm  
#5-40 UNC #38 .1015" 2.5781 mm #5-40 UNC
#5-44 UNF #37 .104" 2.6416 mm #5-44 UNF
#6-32 UNC #36 .1065" 2.7051 mm #6-32 UNC
7/64" .109375" 2.7781 mm #3 Wood Shank Hole 
#4 Wood Shank Hole 
#9 Pilot, Hard-wood 
#10 Pilot, Hard-wood 
#12 Pilot, Soft-wood 
#14 Pilot, Soft-wood
  #35 .11" 2.7940 mm  
  #34 .111" 2.8194 mm  
#6-40 UNF #33 .113" 2.8702 mm #6-40 UNF
    .1142" 2.9000 mm M3.5x.6 coarse
  #32 .116" 2.9464 mm  
    .1181" 3.0000 mm  
  #31 .12" 3.0480 mm  
1/8" .125" 3.1750 mm #5 Wood Shank Hole 
#11 Pilot, Hard-wood 
#12 Pilot, Hard-wood
  #30 .1285" 3.2639 mm  
    .1299" 3.3000 mm M4x.7 coarse
#8-32 UNC 
#8-36 UNF
#29 .136" 3.4544 mm #8-32 UNC #8-36 UNF
    .1378" 3.5000 mm M4x.5 Fine
  #28 .1405" 3.5687 mm  
9/64" .140625" 3.5719 mm #6 Wood Shank Hole 
#14 Pilot, Hard-wood 
#16 Pilot, Soft-wood 
#18 Pilot, Soft-wood
    .1417" 3.6000 mm M4x.35 Fine
  #27 .144" 3.6576 mm  
    .1457" 3.7000 mm M4.5x.75 coarse
  #26 .147" 3.7338 mm  
#10-24 UNC #25 .1495" 3.7973 mm #10-24 UNC
  #24 .152" 3.8608 mm  
  #23 .154" 3.9116 mm  
5/32" .15625" 3.9688 mm #7 Wood Shank Hole 
#16 Pilot, Hard-wood
  #22 .157" 3.9878 mm  
    .1575" 4.0000 mm  
#10-32 UNF #21 .159" 4.0386 mm #10-32 UNF
  #20 .161" 4.0894 mm  
    .1654" 4.2000 mm M5x.8 coarse
  #19 .166" 4.2164 mm  
  #18 .1695" 4.3053 mm  
11/64" .171875" 4.3656 mm #8 Wood Shank Hole 
#20 Pilot, Soft-wood
#12-24 UNC #17 .173" 4.3942 mm #12-24 UNC
  #16 .177" 4.4958 mm  
    .1772" 4.5000 mm M5x.5 Fine
#12-28 UNF #15 .18" 4.5720 mm #12-28 UNF
  #14 .182" 4.6228 mm  
  #13 .185" 4.6990 mm  
3/16" .1875" 4.7625 mm #9 Wood Shank Hole 
#10 Wood Shank Hole 
#18 Pilot, Hard-wood
  #12 .189" 4.8006 mm  
  #11 .191" 4.8514 mm  
  #10 .1935" 4.9149 mm  
  # 9 .196" 4.9784 mm  
    .1969" 5.0000 mm M6x1 coarse
  # 8 .199" 5.0546 mm  
"-20 UNC # 7 .201" 5.1054 mm "-20 UNC
13/64" .203125" 5.1594 mm #11 Wood Shank Hole 
#20 Pilot, Hard-wood
  # 6 .204" 5.1816 mm  
  # 5 .2055" 5.2197 mm  
    .2067" 5.2500 mm M6x.75 Fine
  # 4 .209" 5.3086 mm  
"-28 UNF # 3 .213" 5.4102 mm "-28 UNF
    .2165" 5.5000 mm M6x.5 Fine
7/32" .21875" 5.5563 mm #12 Wood Shank Hole
  # 2 .221" 5.6134 mm  
  # 1 .228" 5.7912 mm  
  A .234" 5.9436 mm  
15/64" .234375" 5.9531 mm  
    .2362" 6.0000 mm M7x1 coarse
  B .238" 6.0452 mm  
  C .242" 6.1468 mm  
  D .246" 6.2484 mm 1/16"-27 NPT
    .2461" 6.2500 mm M7x.75 Fine
1/4" .25" 6.3500 mm #14 Wood Shank Hole
  E .25" 6.3500 mm  
    .2559" 6.5000 mm  
5/16"-18 UNC F .257" 6.5278 mm 5/16"-18 UNC
  G .261" 6.6294 mm  
17/64" .265625" 6.7469 mm #16 Wood Shank Hole
  H .266" 6.7564 mm  
    .2677" 6.8000 mm M8x1.25 coarse
5/16"-24 UNF I .272" 6.9088 mm 5/16"-24 UNF
    .2756" 7.0000 mm M8x.5 Fine
  J .277" 7.0358 mm  
  K .281" 7.1374 mm  
9/32" .28125" 7.1438 mm  
    .2854" 7.2500 mm M8x.75 Fine
  L .29" 7.3660 mm  
  M .295" 7.4930 mm  
    .2953" 7.5000 mm M8x1 Fine
19/64" .296875" 7.5406 mm #18 Wood Shank Hole
  N .302" 7.6708 mm  
    .3071" 7.8000 mm M9x1.25 coarse
3/8"-16 UNC 5/16" .3125" 7.9375 mm 3/8"-16 UNC
    .315" 8.0000 mm M9x1 Fine
  O .316" 8.0264 mm  
  P .323" 8.2042 mm  
21/64" .328125" 8.3344 mm #20 Wood Shank Hole
3/8"-24 UNF Q .332" 8.4328 mm 3/8"-24 UNF
    .3346" 8.5000 mm M10x1.5 coarse
  R .339" 8.6106 mm 1/8"-27 NPT
11/32" .34375" 8.7313 mm  
    .3465" 8.8000 mm M10x1.25 Fine
  S .348" 8.8392 mm  
    .3543" 9.0000 mm M10x1 Fine
  T .358" 9.0932 mm 7/16"-14 UNC
23/64" .359375" 9.1281 mm  
    .3642" 9.2500 mm M10x.75 Fine
  U .368" 9.3472 mm  
    .374" 9.5000 mm M11x1.5 coarse
3/8" .375" 9.5250 mm  
  V .377" 9.5758 mm  
  W .386" 9.8044 mm  
7/16"-20 UNF 25/64" .390625" 9.9219 mm 7/16"-20 UNF
    .3937" 10.0000 mm M11x1 Fine
  X .397" 10.0838 mm  
    .4016" 10.2000 mm M12x1.75 coarse
  Y .404" 10.2616 mm  
13/32" .40625" 10.3188 mm  
  Z .413" 10.4902 mm  
    .4134" 10.5000 mm M12x1.5 Fine
"-13 UNC 27/64" .421875" 10.7156 mm "-13 UNC
    .4331" 11.0000 mm M12x1 Fine
  7/16" .4375" 11.1125 mm "-18 NPT
    .4429" 11.2500 mm M12x.75 Fine
    .4528" 11.5000 mm  
"-20 UNF 29/64" .453125" 11.5094 mm "-20 UNF
  15/32" .46875" 11.9063 mm  
    .4724" 12.0000 mm M14x2 coarse
9/16"-12 UNC 31/64" .484375" 12.3031 mm 9/16"-12 UNC
    .4921" 12.5000 mm M14x1.5 Fine
  1/2" .5" 12.7000 mm  
    .5039" 12.8000 mm M14x1.25 Fine
    .5118" 13.0000 mm M14x1 Fine
9/16"-18 UNF 33/64" .515625" 13.0969 mm 9/16"-18 UNF
5/8"-11 UNC 17/32" .53125" 13.4938 mm 5/8"-11 UNC
    .5315" 13.5000 mm  
  35/64" .546875" 13.8906 mm  
    .5512" 14.0000 mm M16x2 coarse
5/8"-18 UNF 9/16" .5625" 14.2875 mm 5/8"-18 UNF
    .5709" 14.5000 mm M16x1.5 Fine
37/64" .578125" 14.6844 mm 3/8"-18 NPT
    .5906" 15.0000 mm M16x1 Fine
  19/32" .59375" 15.0813 mm  
  39/64" .609375" 15.4781 mm  
    .6102" 15.5000 mm M18x2.5 coarse
5/8" .625" 15.8750 mm  
    .6299" 16.0000 mm M18x2 Fine
3/4"-10 UNC 41/64" .640625" 16.2719 mm 3/4"-10 UNC
    .6496" 16.5000 mm  
  21/32" .65625" 16.6688 mm  
    .6693" 17.0000 mm M18x1 Fine
  43/64" .671875" 17.0656 mm  
3/4"-16 UNF 11/16" .6875" 17.4625 mm 3/4"-16 UNF
    .689" 17.5000 mm M20x2.5 coarse
  45/64" .703125" 17.8594 mm 1/2"-14 NPT
    .7087" 18.0000 mm M20x2 Fine
23/32" .71875" 18.2563 mm  
    .7283" 18.5000 mm M20x1.5 Fine
47/64" .734375" 18.6531 mm  
    .748" 19.0000 mm M20x1 Fine
3/4" .75" 19.0500 mm  
7/8"-9 UNC 49/64" .765625" 19.4469 mm 7/8"-9 UNC
    .7677" 19.5000 mm M22x2.5 coarse
25/32" .78125" 19.8438 mm  
    .7874" 20.0000 mm M22x2 Fine
51/64" .796875" 20.2406 mm  
    .8071" 20.5000 mm M22x1.5 Fine
7/8"-14 UNF 13/16" .8125" 20.6375 mm 7/8"-14 UNF
    .8268" 21.0000 mm M24x3 coarse    
M22x1 Fine
53/64" .828125" 21.0344 mm  
27/32" .84375" 21.4313 mm  
    .8465" 21.5000 mm  
55/64" .859375" 21.8281 mm  
    .8661" 22.0000 mm M24x2 Fine
1"-8 UNC 7/8" .875" 22.2250 mm 1"-8 UNC
    .8858" 22.5000 mm M24x1.5 Fine
57/64" .890625" 22.6219 mm  
    .9055" 23.0000 mm  
1"-12 UNF 29/32" .90625" 23.0188 mm 1"-12 UNF
59/64" .921875" 23.4156 mm "-14 NPT
    .9252" 23.5000 mm  
15/16" .9375" 23.8125 mm  
    .9449" 24.0000 mm M27x3 coarse
61/64" .953125" 24.2094 mm  
    .9646" 24.5000 mm M26x1.5 Fine
31/32" .96875" 24.6063 mm  
    .9843" 25.0000 mm M27x2 Fine
1-1/8"-7 UNC 63/64" .984375" 25.0031 mm 1-1/8"-7 UNC
1" 1.000" 25.4000 mm  
    1.0039" 25.5000 mm M27x1.5 Fine
    1.0433" 26.5000 mm M30x3.5 coarse
    1.0433" 26.5000 mm M28x1.5 Fine
1-1/8"-12 UNF 1-3/64" 1.046875" 26.5906 mm 1-1/8"-12 UNF
1-1/16" 1.0625" 26.9875 mm  
    1.1024" 28.0000 mm M30x2 Fine
1 1/4"-7 UNC 1-7/64" 1.109375" 28.1781 mm 1 1/4"-7 UNC
    1.122" 28.5000 mm M30x1.5 Fine
1-1/8" 1.125" 28.5750 mm  
1-5/32" 1.15625" 29.3688 mm 1"-11 NPT
    1.1614" 29.5000 mm M33x3.5 coarse
1 1/4"-12 UNF 1-11/64" 1.171875" 29.7656 mm 1 1/4"-12 UNF
1-3/16" 1.1875" 30.1625 mm  
    1.2205" 31.0000 mm M33x2 Fine
    1.2598" 32.0000 mm M36x4 coarse
    1.2992" 33.0000 mm M36x3 Fine
1 1/2"-6 UNC 1-11/32" 1.34375" 34.1313 mm 1 1/2"-6 UNC
1-3/8" 1.375" 34.9250 mm  
    1.378" 35.0000 mm M39x4 coarse
    1.4173" 36.0000 mm M39x3 Fine
1 1/2"-12 UNF 1-27/64" 1.421875" 36.1156 mm 1 1/2"-12 UNF
1-7/16" 1.4375" 36.5125 mm  
1-1/2" 1.5" 38.1000 mm 1 1/4"-11 NPT
1 3/4"-5 UNC 1-35/64" 1.546875" 39.2906 mm 1 3/4"-5 UNC
  1-9/16" 1.5625" 39.6875 mm  
  1-5/8" 1.625" 41.2750 mm  
1"-12 UNF 1-43/64" 1.671875" 42.4656 mm 1"-12 UNF
  1-47/64" 1.734375" 44.0531 mm 1"-11 NPT
1-3/4" 1.75" 44.4500 mm  
2"-4 UNC 1-25/32" 1.78125" 45.2438 mm 2"-4 UNC
  1-13/16" 1.8125" 46.0375 mm  
  1-7/8" 1.875" 47.6250 mm  
2"-12 UNF 1-59/64" 1.921875" 48.8156 mm 2"-12 UNF
1-15/16" 1.9375" 49.2125 mm  
2 1/4 - 4 1/2 UNC 2-1/32" 2.03125"   2 1/4 - 4 1/2 UNC
2-7/32" 2.21875" 56.3563 mm 2"-11 NPT
2 1/2 - 4 1/2 UNC 2-1/4" 2.25" 2 1/2 - 4 1/2 UNC
2 3/4 - 4 UNC 2-1/2" 2.50" 2 3/4 - 4 UNC
2-5/8" 2.625" 66.675 mm 2-8 NPT
3" - 4 UNC 2-3/4" 2.75" 3" - 4 UNC
3 1/4 - 4 UNC

3"

3.000" 3 1/4 - 4 UNC
3 1/2 - 4 UNC
3-1/4" 3.25" 82.55 mm 3 1/2-4 UNC
3"-8 NPT
3 3/4" - 4 UNC 3-1/2" 3.50"   3 3/4" - 4 UNC
4" - 4 UNC

3-3/4"

3.75" 88.90 mm 4" - 4 UNC
3"-8 NPT
4-1/4" 4.25" 107.95 mm 4"-8 NPT