2.
50.80 53.34 55.88 58.42 60.96 63.50 66.04 68.58 71.12 73.66

3.
76.20 78.74 81.28 83.82 86.36 88.90 91.44 93.98 96.52 99.06

4.
101.60 104.14 106.68 109.22 111.76 114.30 116.84 119.38 121.92 124.46

5.
127.00 129.54 132.08 134.62 137.16 139.70 142.24 144.78 147.32 149.86

6.
152.40 154.94 157.48 160.02 162.56 165.10 167.64 170.18 172.72 175.26

7.
177.80 180.34 182.88 185.42 187.96 190.50 193.04 195.58 198.12 200.66

8.
203.20 205.74 208.28 210.82 213.36 215.90 218.44 220.98 223.52 226.06

9.
228.60 231.14 233.68 236.22 238.76 241.30 243.84 246.38 248.92 251.46

EFFECTIVITY:
040-999
91-00-00 PAGE
Jan 10/90

PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCEMANUAL

L. Drill Sizes
CHART 14
DECIMAL / MILLIMETER EQUIVALENTS OF DRILL SIZES

Decimal/Millmeter Equivalentsof Drill Sizes From 1/2" to No. 80
Size  Decimal Millimeter Size Decimal Millimeter Size Decimal Millimeter Size Decimal Millimeter Equiv. Equiv. Equiv. Equiv. Equiv. Equiv. Equiv. Equiv.
1/2 0.500 12.7000 G 0.261 6.6294 5/32 0.1562 3.9687 51 0.067 1.7018 31/64 0.4843 12.3031 F 0.257 6.5278 23 0.154 3.9116 52 0.0635 1.6129 15/32 0.4687 11.9062 E-1/4 0.250 6.3500 24 0.152 3.8608 1/16 0.0625 1.5875 29/64 0.4531 11.5094 D 0.246 6.2484 25 0.1495 3.7973 53 0.0595 1.5113
7/16  0.4375 11.1125 C 0.242 6.1468 26 0.147 3.7338 54 0.055 1.397
27/64 0.4218 10.7156 B 0.238 6.0452 27 0.144 3.6576 55 0.052 1.3208 Z 0.413 10.4902 15/64 0.2343 5.9531 9/64 0.1406 3.5719 3/64 0.0468 1.1906
13/32 0.4062 10.3187 A 0.234 5.9436 28 0.1405 3.5687 56 0.0465 1.1811 Y 0.404 10.2616 1 0.228 5.7912 29 0.136 3.4544 57 0.043 1.0922 X 0.397 10.0838 2 0.221 5.6134 30 0.01285 3.2639 58 0.042 1.0668
25/64 0.3906 9.9212 7/32 0.2187 5.5562 1/8 0.125 3.1750 59 0.041 1.0414
W 0.386 9.8044 3 0.213 5.4102 31 0.120 3.048 60 0.040 1.016
V 0.377 9.5758 4 0.209 5.3086 32 0.116 2.9464 61 0.039 0.9906
3/8 0.375 9.5250 5 0.2055 5.2197 33 0.113 2.8702 62 0.038 0.9652
U 0.368 9.3472 6 0.204 5.1816 34 0.111 2.8194 63 0.037 0.9398

23/64 0.3593 9.1262 13/64 0.2031 5.1594 35 0.110 2.794 64 0.036 0.9144
T 0.358 9.1281 7 0.201 5.1054 7/64 0.1093 2.7781 65 0.035 0.899
S 0.346 8.7884 8 0.199 5.0546 36 0.1065 2.7051 66 0.033 0.8382

11/32 0.3437 8.7300 9 0.196 4.9784 37 0.104 2.6416 1/32 0.0312 0.7937 R 0.339 8.6106 10 0.1935 4.9149 38 0.1015 2.5781 67 0.032 0.8128
Q 0.332 8.4328 11 0.191 4.8514 39 0.0995 2.5273 68 0.031 0.7874
21/64 0.3281 8.3337 12 0.189 4.8006 40 0.098 2.4892 69 0.029 0.7366
P 0.323 8.2042 3/16 0.1875 4.7625 41 0.096 2.4384 70 0.028 0.7112

0 0.316 8.0264 13 0.185 4.699 3/32 0.0937 2.3812 71 0.026 0.6604 5/16 0.3125 7.9375 14 0.182 4.6228 42 0.0935 2.3749 72 0.025 0.635
N 0.302 7.6708 15 0.180 4.572 43 0.089 2.2606 73 0.024 0.0696
19/64 0.2968 7.5387 16 0.177 4.4958 44 0.086 2.1844 74 0.0229 0.58166 M 0.295 7.4930 17 0.173 4.3942 45 0.082 2.0828 75 0.021 0.5334 L 0.290 7.3660 11/64 0.1718 4.3656 46 0.081 2.0574 76 0.020 0.508
9/32  0.2812 7.1425 18 0.1695 4.3053 47 0.0785 1.9939 77 0.018 0.4572
K 0.281 7.1374 19 0.166 4.2164 5/64 0.0781 1.9844 1/64 0.0156 0.3969
J 0.277 7.0358 20 0.161 4.0894 48 0.076 1.9304 78 0.016 0.4064
I 0.272 6.9088 21 0.159 4.0386 49 0.073 1.8542 79 0.0145 0.3683
H 0.266 6.7564 22 0.157 3.9878 50 0.070 1.778 80 0.0135 0.3429

17/64 0.2656 6.7462
DRILL SIZES AVAILABLE Drill may be obtained in regular sizes to a 4 inch diameter, and increase in 64ths of an inch. The regular metric drills vary from 2 to 76mm and increase in 0.5mm variations.
EFFECTIVITY: 040-999 PAGE26 91-00-00 Jan 10/9