Login

Fillable Printable Tap Drill and Thread Height Chart

Fillable Printable Tap Drill and Thread Height Chart

Tap Drill and Thread Height Chart

Tap Drill and Thread Height Chart

Thread Ma
j
or Threads
p
er
Tap Drill Tap Tap Drill Theoretical
%
Size Diameter Inch
(
TPI
)
Range Drill Decimal of Thread
0-80 0.0600 80 0.0465 - 0.0514
3/64 0.0469 80.7%
1-64 0.0730 64 0.0561 - 0.0623
53 0.0595 66.5%
53 0.0595 74.8%
1/16 0.0625 58.2%
52 0.0635 52.7%
51 0.0670 81.9%
50 0.0700 69.0%
49 0.0730 56.0%
50 0.0700 78.8%
49 0.0730 64.0%
48 0.0760 85.0%
5/64 0.0781 77.2%
47 0.0785 75.8%
2mm 0.0787 75.0%
46 0.0810 66.5%
45 0.0820 62.8%
46 0.0810 77.6%
45 0.0820 73.3%
44 0.0860 56.0%
44 0.0860 80.1%
43 0.0890 70.8%
42 0.0935 57.0%
3/32 0.0937 56.4%
42 0.0935 68.4%
3/32 0.0937 67.6%
41 0.0960 59.1%
40 0.0980 83.1%
39 0.0995 78.5%
38 0.1015 72.4%
37 0.1040 64.7%
38 0.1015 79.6%
37 0.1040 71.1%
36 0.1065 62.7%
37 0.1040 83.8%
36 0.1065 77.6%
7/64 0.1094 70.5%
35 0.1100 69.0%
34 0.1110 66.5%
33 0.1130 61.6%
34 0.1110 83.1%
33 0.1130 77.0%
32 0.1160 67.7%
3mm 0.1181 61.3%
8-32 0.1640 32 0.1300 - 0.1389
29 0.1360 69.0%
29 0.1360 77.6%
28 0.1405 65.1%
9/64 0.1406 64.8%
26 0.1470 79.4%
25 0.1495 74.8%
24 0.1520 70.2%
23 0.1540 66.5%
24 0.1520 81.9%
23 0.1540 77.6%
5/32 0.1562 72.9%
400.13806-40
0.190010-28
240.190010-24
360.16408-36
560.09903-56
28
5-40
480.11204-48
400.11204-40
0.08602-56
320.13806-32
440.12505-44
400.1250
720.07301-72
480.09903-48
2-64 0.0860 64
56
0.0979 - 0.1062
0.0894 - 0.0968
0.0849 - 0.0939
0.0797 - 0.0865
0.0764 - 0.0845
0.0691 - 0.0753
0.0667 - 0.0737
0.0580 - 0.0635
0.1510 - 0.1600
0.1450 - 0.1555
0.1340 - 0.1416
0.1110 - 0.1186
0.1040 - 0.1140
0.1004 - 0.1079
Tap Drill & Thread Height Chart
This chart disp lays a var ie ty of UN Thre ad size s, the ir likely Tap Dr ills and the resulting Theoretical
Thread Height Per centag e . This perce ntag e is thoeretical as holes are often drilled slightly oversized.
Typically, tap drills are selected to result in a 60% - 75% thread height. There is neglible increased
strength in threads with more than 60% thread height and larger tap drills are preferred for their
strength and speed.
Thread Ma
j
or Threads
p
er
Tap Drill Tap Tap Drill Theoretical
%
Size Diameter Inch
(
TPI
)
Range Drill Decimal of Thread
22 0.1570 71.1%
4mm 0.1575 70.1%
5/32 0.1562 83.3%
22 0.1570 81.3%
4mm 0.1575 80.1%
21 0.1590 76.4%
20 0.1610 71.4%
20 0.1610 80.4%
19 0.1660 66.5%
10-40 0.1900 40 0.1630 - 0.1690
19 0.1660 73.9%
18 0.1695 75.8%
11/64 0.1719 66.9%
11/64 0.1719 78.0%
17 0.1730 73.3%
11/64 0.1719 81.5%
17 0.1730 79.4%
16 0.1770 72.1%
15 0.1800 66.5%
16 0.1770 84.1%
15 0.1800 77.6%
14 0.1820 73.3%
13 0.1850 66.8%
14 0.1820 83.8%
13 0.1850 76.4%
3/16 0.1875 70.2%
12 0.1890 66.5%
3/16 0.1875 79.0%
12 0.1890 74.8%
11 0.1910 69.3%
12 0.1890 83.1%
11 0.1910 77.0%
10 0.1935 69.3%
10 0.1935 83.1%
9 0.1960 73.9%
5mm 0.1968 70.9%
8 0.1990 73.3%
7 0.2010 64.7%
9 0.1960 83.1%
5mm 0.1968 81.9%
8 0.1990 78.5%
7 0.2010 75.4%
13/64 0.2031 72.2%
6 0.2040 70.8%
5 0.2055 68.5%
5 0.2055 82.2%
4 0.2090 75.8%
3 0.2130 68.4%
3 0.2130 76.9%
7/32 0.2187 65.1%
3 0.2130 79.8%
7/32 0.2187 67.5%
7/32 0.2187 77.1%
2 0.2210 71.4%
1 0.2280 54.2%
1/4-36 0.2500 36 0.2200 - 0.2260
2 0.2210 80.4%
1/4-40 0.2500 40 0.2230 - 0.2290
1 0.2280 67.7%
1/4-48 0.2500 48 0.2270 - 0.2320
1 0.2280 81.3%
A 0.2340 69.0%
15/64 0.2344 67.3%
F 0.2570 76.9%
G 0.2610 71.4%
G 0.2610 79.3%
17/64 0.2656 72.2%
H 0.2660 71.6%
I 0.2720 74.8%
7mm 0.2756 68.2%
I 0.2720 84.2%
7mm 0.2756 76.7%
24
1/4-28
200.25001/4-20
270.25001/4-27
560.25001/4-56
0.25001/4-24
320.25001/4-32
280.2500
200.31255/16-20
180.31255/16-18
270.31255/16-27
240.31255/16-24
560.190010-56
480.190010-48
280.216012-28
240.216012-24
0.216012-40
360.216012-36
320.216012-32
560.216012-56
480.216012-48
40
360.190010-36
320.190010-32
0.1930 - 0.1980
0.1890 - 0.1950
0.1860 - 0.1920
0.1820 - 0.1895
0.1770 - 0.1857
0.1710 - 0.1807
0.1710 - 0.1750
0.1670 - 0.1720
0.1600 - 0.1660
0.1560 - 0.1640
0.2720 - 0.2810
0.2670 - 0.2754
0.2580 - 0.2680
0.2520 - 0.2630
0.2310 - 0.2350
0.2160 - 0.2229
0.2110 - 0.2190
0.2100 - 0.2190
0.2050 - 0.2150
0.1960 - 0.2067
0.1970 - 0.2010
Thread Ma
j
or Threads
p
er
Tap Drill Tap Tap Drill Theoretical
%
Size Diameter Inch
(
TPI
)
Range Drill Decimal of Thread
J 0.2770 73.8%
K 0.2810 65.5%
7mm 0.2756 79.5%
J 0.2770 76.5%
K 0.2810 77.6%
9/32 0.2812 77.1%
5/16-36 0.3125 36 0.2820 - 0.2890
Special
5/16-40 0.3125 40 0.2850 - 0.2910
L 0.2900 69.3%
L 0.2900 83.1%
M 0.2950 64.7%
5/16 0.3125 77.0%
8mm 0.3150 73.9%
O 0.3160 72.7%
8mm 0.3150 83.1%
O 0.3160 81.8%
P 0.3230 72.1%
P 0.3230 80.1%
21/64 0.3281 72.2%
3/8-24 0.3750 24 0.3300 - 0.3372
Q 0.3320 79.4%
R 0.3390 74.8%
11/32 0.3437 65.1%
3/8-28 0.3750 28 0.3360 - 0.3426
R 0.3390 77.6%
3/8-32 0.3750 32 0.3410 - 0.3469
11/32 0.3437 77.1%
3/8-36 0.3750 36 0.3450 - 0.3520
S 0.3480 74.8%
3/8-40 0.3750 40 0.3480 - 0.3540
S 0.3480 83.1%
7/16-14 0.4375 14 0.3600 - 0.3717
U 0.3680 74.9%
3/8 0.3750 77.0%
V 0.3770 74.5%
V 0.3770 83.8%
W 0.3860 71.4%
W 0.3860 79.3%
25/64 0.3906 72.2%
10mm 0.3937 80.9%
X 0.3970 74.8%
X 0.3970 84.2%
Y 0.4040 69.6%
7/16-28 0.4375 28 0.3990 - 0.4051
Y 0.4040 72.2%
Y 0.4040 82.5%
13/32 0.4062 77.1%
Z 0.4130 80.4%
27/64 0.4219 72.1%
1/2-13 0.5000 13 0.4170 - 0.4284
27/64 0.4219 78.2%
11mm 0.4331 72.1%
7/16 0.4375 67.4%
11mm 0.4331 82.4%
7/16 0.4375 77.0%
1/2-18 0.5000 18 0.4400 - 0.4530
Special
1/2-20 0.5000 20 0.4460 - 0.4537
29/64 0.4531 72.2%
1/2-24 0.5000 24 0.4550 - 0.4650
Special
1/2-27 0.5000 27 0.4600 - 0.4690
15/32 0.4687 65.1%
1/2-28 0.5000 28 0.4610 - 0.4676
Special
1/2-32 0.5000 32 0.4660 - 0.4719
15/32 0.4687 77.1%
9/16-12 0.5625 12 0.4720 - 0.4843
12mm 0.4724 83.2%
9/16-14 0.5625 14 0.4850 - 0.5010
1/2 0.5000 67.4%
9/16-16 0.5625 16 0.4950 - 0.5040
1/2 0.5000 77.0%
9/16-18 0.5625 18 0.5020 - 0.5106
Special
13mm 0.5118 78.1%
33/64 0.5156 72.2%
9/16-24 0.5625 24 0.5170 - 0.5244
Special
9/16-27 0.5625 27 0.5220 - 0.5310
Special
9/16-28 0.5625 28 0.5240 - 0.5301
Special
9/16-32 0.5625 32 0.5290 - 0.5344
17/32 0.5312 77.1%
5/8-11 0.6250 11 0.5270 - 0.5391
17/32 0.5312 79.4%
5/8-12 0.6250 12 0.5350 - 0.5463
Special
14mm 0.5512 79.5%
9/16 0.5625 67.4%
5/8-16 0.6250 16 0.5570 - 0.5662
9/16 0.5625 77.0%
5/8-18 0.6250 18 0.5650 - 0.5730
Special
120.50001/2-12
0.56259/16-20
160.50001/2-16
14
14
0.50001/2-14
200.37503/8-20
270.37503/8-27
0.4375
0.62505/8-14
20
160.43757/16-16
200.43757/16-20
187/16-18
320.43757/16-32
270.43757/16-27
240.43757/16-24
180.37503/8-18
320.31255/16-32
280.31255/16-28
160.37503/8-16
480.31255/16-48 0.2900 - 0.2950
0.2790 - 0.2847
0.2740 - 0.2807
0.5480 - 0.5640
0.5080 - 0.5162
0.4320 - 0.4419
0.4230 - 0.4380
0.4100 - 0.4223
0.3350 - 0.3440
0.3210 - 0.3297
0.3150 - 0.3280
0.3070 - 0.3182
0.4040 - 0.4094
0.3970 - 0.4060
0.3920 - 0.4020
0.3830 - 0.3916
0.3770 - 0.3900
0.3700 - 0.3800
Thread Ma
j
or Threads
p
er
Tap Drill Tap Tap Drill Theoretical
%
Size Diameter Inch
(
TPI
)
Range Drill Decimal of Thread
5/8-20 0.6250 20 0.5710 - 0.5787
37/64 0.5781 72.2%
5/8-24 0.6250 24 0.5800 - 0.5869
Special
15mm 0.5906 71.5%
19/32 0.5937 65.1%
5/8-28 0.6250 28 0.5860 - 0.5926
15mm 0.5906 74.1%
5/8-32 0.6250 32 0.5910 - 0.5969
19/32 0.5937 77.1%
11/16-12 0.6875 12 0.5970 - 0.6085
Special
11/16-16 0.6875 16 0.6200 - 0.6284
5/8 0.6250 77.0%
11/16-20 0.6875 20 0.6330 - 0.6412
41/64 0.6406 72.2%
11/16-24 0.6875 24 0.6420 - 0.6494
Special
11/16-28 0.6875 28 0.6490 - 0.6551
Special
11/16-32 0.6875 32 0.6540 - 0.6594
21/32 0.6562 77.1%
3/4-10 0.7500 10 0.6420 - 0.6545
Special
3/4-12 0.7500 12 0.6600 - 0.6707
17mm 0.6693 74.5%
3/4-14 0.7500 14 0.6730 - 0.6880
11/16 0.6875 67.4%
3/4-16 0.7500 16 0.6820 - 0.6908
11/16 0.6875 77.0%
3/4-18 0.7500 18 0.6900 - 0.7030
Special
3/4-20 0.7500 20 0.6960 - 0.7037
45/64 0.7031 72.2%
3/4-24 0.7500 24 0.7050 - 0.7150
18mm 0.7087 76.3%
3/4-28 0.7500 28 0.7110 - 0.7176
Special
3/4-32 0.7500 32 0.7160 - 0.7219
23/32 0.7187 77.1%
13/16-12 0.8125 12 0.7220 - 0.7329
Special
19mm 0.7480 79.4%
3/4 0.7500 77.0%
13/16-20 0.8125 20 0.7580 - 0.7662
49/64 0.7656 72.2%
13/16-28 0.8125 28 0.7740 - 0.7801
Special
13/16-32 0.8125 32 0.7790 - 0.7844
25/32 0.7812 77.1%
7/8-9 0.8750 9 0.7550 - 0.7681
49/64 0.7656 75.8%
25/32 0.7812 72.2%
20mm 0.7874 67.4%
7/8-12 0.8750 12 0.7850 - 0.7948
Special
7/8-14 0.8750 14 0.7980 - 0.8068
Special
7/8-16 0.8750 16 0.8070 - 0.8158
13/16 0.8125 77.0%
7/8-18 0.8750 18 0.8150 - 0.8280
21mm 0.8268 66.8%
21mm 0.8268 74.2%
53/64 0.8281 72.2%
7/8-24 0.8750 24 0.8300 - 0.8400
Special
7/8-27 0.8750 27 0.8350 - 0.8440
27/32 0.8437 65.1%
7/8-28 0.8750 28 0.8360 - 0.8426
Special
7/8-32 0.8750 32 0.8410 - 0.8469
27/32 0.8437 77.1%
15/16-12 0.9375 12 0.8470 - 0.8575
Special
15/16-16 0.9375 16 0.8700 - 0.8783
7/8 0.8750 77.0%
15/16-20 0.9375 20 0.8830 - 0.8912
57/64 0.8906 72.2%
15/16-28 0.9375 28 0.8990 - 0.9051
Special
23mm 0.9055 78.8%
29/32 0.9062 77.1%
22mm 0.8661 82.5%
7/8 0.8750 77.0%
23mm 0.9055 72.7%
29/32 0.9062 72.2%
1-12 1.0000 12 0.9100 - 0.9198
Special
1-14 1.0000 14 0.9230 - 0.9315
Special
1-16 1.0000 16 0.9320 - 0.9408
15/16 0.9375 77.0%
1-18 1.0000 18 0.9400 - 0.9530
24mm 0.9449 76.4%
1-20 1.0000 20 0.9460 - 0.9537
61/64 0.9531 72.2%
1-24 1.0000 24 0.9550 - 0.9650
Special
1-27 1.0000 27 0.9600 - 0.9690
31/32 0.9687 65.1%
1-28 1.0000 28 0.9610 - 0.9676
Special
1-32 1.0000 32 0.9660 - 0.9719
31/32 0.9687 77.1%
160.812513/16-16
0.937515/16-32
200.87507/8-20
100.87507/8-10
101.00001-10
81.00001-8
32
270.62505/8-27
0.8920 - 0.9130
0.8650 - 0.8797
0.9040 - 0.9094
0.8210 - 0.8287
0.7670 - 0.7880
0.7450 - 0.7533
0.5850 - 0.5940
Login to HandyPDF
Tips: Editig or filling the file you need via PC is much more easier!
By logging in, you indicate that you have read and agree our Terms and Privacy Policy.