Drill Hole Specs

KATO

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Kato Hole Drilling Specifications
 
 
Please select the thread type below, or you can scroll through the list:
 
Nominal Thread Size Suggested Drill Size* F Dimension** F Dimension**
Minimum Drilling Depth for Taps Minimum Drilling Depth for Taps
Aluminum Steel, Magnesium, Plastic Plug Taps Bottoming Taps
1 1 1/2 2 2 1/2 3 1 1 1/2 2 2 1/2 3
Unified Coarse
2-56 3/32 (.0938) #41 (.0960) 0.236 0.279 0.322 0.365 0.408 0.157 0.200 0.243 0.286 0.329
3-48 #36 (.1065) 7/64 (.1094) 0.273 0.323 0.372 0.422 0.471 0.182 0.232 0.281 0.331 0.380
4-40 #31 (.1200) #31 (.1200) 0.318 0.374 0.430 0.486 0.542 0.212 0.268 0.324 0.380 0.436
5-40 3.4mm (.1339) #29 (.1360) 0.338 0.400 0.462 0.525 0.588 0.225 0.288 0.350 0.412 0.475
6-32 #26 (.1470) #25 (.1495) 0.394 0.464 0.532 0.602 0.670 0.263 0.332 0.401 0.470 0.539
8-32 #17 (.1730) #16 (.1770) 0.434 0.516 0.598 0.680 0.762 0.289 0.371 0.453 0.535 0.617
10-24 13/64 (.2031) #5 (.2055) 0.535 0.630 0.725 0.820 0.915 0.357 0.452 0.547 0.642 0.737
12-24 #1 (.2280) #1 (.2280) 0.574 0.682 0.790 0.898 1.006 0.383 0.491 0.599 0.707 0.815
1/4-20 H (.2660) H (.2660) 0.675 0.800 0.925 1.050 1.175 0.450 0.575 0.700 0.825 0.950
5/16-18 Q (.3320) Q (.3320) 0.801 0.957 1.113 1.269 1.425 0.534 0.690 0.846 1.002 1.158
3/8-16 X (.3970) X (.3970) 0.750 0.938 1.125 1.312 1.500 0.625 0.812 1.000 1.188 1.375
7/16-14 29/64 (.4531) 29/64 (.4531) 0.867 1.086 1.305 1.524 1.743 0.742 0.943 1.162 1.381 1.600
1/2-13 33/64 (.5156) 17/32 (.5312) 0.962 1.212 1.462 1.712 1.962 0.808 1.058 1.308 1.558 1.808
9/16-12 37/64 (.5781) 19/32 (.5938) 1.062 1.343 1.624 1.905 2.186 0.895 1.176 1.457 1.738 2.019
5/8-11 21/32 (.6562) 21/32 (.6562) 1.170 1.483 1.795 2.108 2.420 0.989 1.301 1.614 1.926 2.239
3/4-10 25/32 (.7812) 25/32 (.7812) 1.350 1.725 2.100 2.475 2.850 1.150 1.525 1.900 2.275 2.650
7/8-9 29/32 (.9062) 29/32 (.9062) 1.542 1.979 2.417 2.854 3.292 1.319 1.757 2.194 2.632 3.069
1-8 1-1/32 (1.0312) 1-1/32 (1.0312) 1.750 2.250 2.750 3.250 3.750 1.500 2.000 2.500 3.000 3.500
1 1/8-7 1-11/64 (1.1719) 1-11/64 (1.1719) 1.982 2.545 3.107 3.670 4.232 1.696 2.259 2.821 3.384 3.946
1 1/4-7 1-19/64 (1.2969) 1-19/64 (1.2969) 2.107 2.732 3.357 3.982 4.607 1.821 2.446 3.071 3.696 4.321
1 3/8-6 1-27/64 (1.4219) 1-27/64 (1.4219) 2.375 3.062 3.750 4.437 5.125 2.042 2.729 3.417 4.104 4.792
1 1/2-6 1-35/64 (1.5469) 1-35/64 (1.5469) 2.500 3.250 4.000 4.750 5.500 2.167 2.917 3.667 4.417 5.167
Unified Fine
3-56 #37 (.1040) #36 (.1065) 0.256 0.305 0.355 0.404 0.454 0.170 0.220 0.269 0.319 0.368
4-48 3mm (.1181) #31 (.1200) 0.293 0.349 0.405 0.461 0.517 0.195 0.251 0.307 0.363 0.419
6-40 #26 (.1470) #25 (.1495) 0.357 0.426 0.495 0.564 0.633 0.238 0.307 0.376 0.445 0.514
8-36 #17 (.1730) #16 (.1770) 0.413 0.495 0.577 0.659 0.741 0.275 0.357 0.439 0.521 0.603
10-32 #7 (.2010) 13/64 (.2031) 0.472 0.568 0.662 0.758 0.852 0.315 0.410 0.505 0.600 0.695
1/4-28 G (.2610) 6.7mm (.2638) 0.589 0.714 0.839 0.964 1.089 0.393 0.518 0.643 0.768 0.893
5/16-24 21/64 (.3281) 21/64 (.3281) 0.718 0.874 1.030 1.186 1.342 0.479 0.635 0.791 0.947 1.103
3/8-24 25/64 (.3906) 25/64 (.3906) 0.625 0.812 1.000 1.187 1.375 0.542 0.729 0.917 1.104 1.292
7/16-20 29/64 (.4531) 29/64 (.4531) 0.738 0.957 1.176 1.395 1.614 0.638 0.857 1.076 1.295 1.514
1/2-20 33/64 (.5156) 33/64 (.5156) 0.800 1.050 1.300 1.550 1.800 0.700 0.950 1.200 1.450 1.700
9/16-18 37/64 (.5781) 37/64 (.5781) 0.895 1.176 1.457 1.738 2.019 0.784 1.065 1.346 1.627 1.908
5/8-18 41/64 (.6406) 41/64 (.6406) 0.958 1.271 1.583 1.896 2.208 0.847 1.160 1.472 1.785 2.097
3/4-16 49/64 (.7656) 49/64 (.7656) 1.125 1.500 1.875 2.250 2.625 1.000 1.375 1.750 2.125 2.500
7/8-14 57/64 (.8906) 57/64 (.8906) 1.304 1.741 2.179 2.616 3.054 1.161 1.598 2.036 2.473 2.911
1-12 1-1/64 (1.0156) 1-1/32 (1.0312) 1.500 2.000 2.500 3.000 3.500 1.333 1.833 2.333 2.833 3.333
1 1/8-12 1-9/64 (1.1406) 1-5/32 (1.1562) 1.625 2.187 2.750 3.312 3.875 1.458 2.021 2.583 3.146 3.708
1 1/4-12 1-17/64 (1.2656) 1-9/32 (1.2812) 1.750 2.375 3.000 3.625 4.250 1.583 2.208 2.833 3.458 4.083
1 3/8-12 1-25/64 (1.3906) 1-13/32 (1.4062) 1.875 2.562 3.250 3.937 4.625 1.708 2.393 3.083 3.771 4.458
1 1/2-12 1-33/64 (1.5156) 1-17/32 (1.5312) 2.000 2.750 3.500 4.250 5.000 1.833 2.583 3.333 4.083 4.833
 
Nominal
Thread
Size		 Suggested Drill Size* F Dimension** F Dimension**
Minimum Drilling Depth for Taps Minimum Drilling Depth for Taps
Aluminum Steel, Magnesium, Plastic Plug Taps Bottoming Taps
1 1 1/2 2 2 1/2 3 1 1 1/2 2 2 1/2 3
Metric Coarse
M2.2X0.45 2.30 2.35 6.00 7.10 8.20 9.30 10.40 4.00 5.10 6.20 7.30 8.40
M2.5X0.45 2.55 2.65 6.45 7.70 8.95 10.20 11.45 4.30 5.55 6.80 8.05 9.30
M3X0.5 3.15 3.20 7.50 9.00 10.50 12.00 13.50 5.00 6.50 8.00 9.50 11.00
M3.5X0.6 3.70 3.70 8.85 10.60 12.35 14.10 15.85 5.90 7.65 9.40 11.15 12.90
M4X0.7 4.20 4.25 10.20 12.20 14.20 16.20 18.20 6.80 8.80 10.80 12.80 14.80
M5X0.8 5.20 5.30 12.30 14.80 17.30 19.80 22.30 8.20 10.70 13.20 15.70 18.20
M6X1 6.25 6.35 15.00 18.00 21.00 34.00 27.00 10.00 13.00 16.00 19.00 22.00
M7X1 7.25 7.30 16.50 20.00 23.50 27.00 30.50 11.00 14.50 18.00 21.50 25.00
M8X1.25 8.30 8.40 19.50 23.50 27.50 31.50 35.50 13.00 17.00 21.00 25.00 29.00
M10X1.5 10.50 10.50 19.00 24.00 29.00 34.00 39.00 16.00 21.00 26.00 31.00 36.00
M12X1.75 12.50 12.50 22.50 28.50 34.50 40.50 46.50 19.00 25.00 31.00 37.00 43.00
M14X2 14.50 14.50 26.00 33.00 40.00 47.00 54.00 22.00 29.00 36.00 43.00 50.00
M16X2 16.50 16.50 28.00 36.00 44.00 52.00 60.00 24.00 32.00 40.00 48.00 56.00
M18X2.5 18.75 18.75 33.00 42.00 51.00 60.00 69.00 28.00 37.00 46.00 55.00 64.00
M20X2.5 20.75 20.75 35.00 45.00 55.00 65.00 75.00 30.00 40.00 50.00 60.00 70.00
M22X2.5 22.75 22.75 37.00 48.00 59.00 70.00 81.00 32.00 43.00 54.00 65.00 76.00
M24X3 24.75 24.75 42.00 54.00 66.00 78.00 90.00 36.00 48.00 60.00 72.00 84.00
M27X3 27.75 27.75 45.00 58.50 72.00 85.50 99.00 39.00 52.50 66.00 79.50 93.00
M30X3.5 31.00 31.00 51.00 66.00 81.00 96.00 111.00 44.00 59.00 74.00 89.00 104.00
M33X3.5 34.00 34.00 54.00 70.50 87.00 103.50 120.00 47.00 63.50 80.00 96.50 113.00
M36X4 37.00 37.00 60.00 78.00 96.00 114.00 132.00 52.00 70.00 88.00 106.00 124.00
M39X4 40.00 40.00 63.00 82.50 102.00 121.50 141.00 55.00 74.50 94.00 113.50 133.00
Metric Fine
M8X1 8.25 8.30 18.00 22.00 26.00 30.00 34.00 12.00 16.00 20.00 24.00 28.00
M10X1 10.25 10.25 16.00 21.00 26.00 31.00 36.00 14.00 19.00 24.00 29.00 34.00
M10X1.25 10.25 10.25 17.50 22.50 27.50 32.50 37.50 15.00 20.00 25.00 30.00 35.00
M12X1.25 12.25 12.25 19.50 25.50 31.50 37.50 43.50 17.00 23.00 29.00 35.00 41.00
M12X1.5 12.25 12.50 21.00 27.00 33.00 39.00 45.00 18.00 24.00 30.00 36.00 42.00
M14X1.5 14.25 14.50 23.00 30.00 37.00 44.00 51.00 20.00 27.00 34.00 41.00 48.00
M16X1.5 16.25 16.50 25.00 33.00 41.00 49.00 57.00 22.00 30.00 38.00 46.00 54.00
M18X1.5 18.25 18.50 27.00 36.00 45.00 54.00 63.00 24.00 33.00 42.00 51.00 60.00
M20X1.5 20.25 20.50 29.00 39.00 49.00 59.00 69.00 26.00 36.00 46.00 56.00 66.00
M22X1.5 22.25 22.50 31.00 42.00 53.00 64.00 75.00 28.00 39.00 50.00 61.00 72.00
M18X2 18.50 18.50 30.00 39.00 48.00 57.00 66.00 26.00 35.00 44.00 53.00 62.00
M20X2 20.50 20.50 32.00 42.00 52.00 62.00 72.00 28.00 38.00 48.00 58.00 68.00
M22X2 22.50 22.50 34.00 45.00 56.00 67.00 78.00 30.00 41.00 52.00 63.00 74.00
M24X2 24.50 24.50 36.00 48.00 60.00 72.00 84.00 32.00 44.00 56.00 68.00 80.00
M27X2 27.50 27.50 39.00 52.50 66.00 79.50 93.00 35.00 48.50 62.00 75.50 89.00
M30X2 30.50 30.50 42.00 57.00 72.00 87.00 102.00 38.00 53.00 68.00 83.00 98.00
M33X2 33.50 33.50 45.00 61.50 78.00 94.50 111.00 41.00 57.50 74.00 90.50 107.00
M36X2 36.50 36.50 48.00 66.00 84.00 102.00 120.00 44.00 62.00 80.00 98.00 116.00
M39X2 39.50 39.50 51.00 70.50 90.00 109.00 129.00 47.00 66.50 86.00 105.50 125.00
M36X3 37.00 37.00 54.00 72.00 90.00 108.00 126.00 48.00 66.00 84.00 102.00 120.00
M39X3 40.00 40.00 57.00 76.50 96.00 115.50 135.00 51.00 70.50 90.00 109.00 129.00