Orifice Drill Size Chart
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1Orifice Drill Size Chart
Decimal
Fraction
Decimal
Fraction
Number &
(inches)
(inches)
(inches)
(inches)
Letter
Decimal
Inch
Letter
Number
mm.
mm.
mm.
.0059
97
0.15
.0935
42
.2441
6.20
.0063
96
0.16
.0938
3/32
.2460
D
.0067
95
0.17
.0945
2.40
.2461
6.25
.0071
94
0.18
.0960
41
.2480
6.30
.0075
93
0.19
.0965
2.45
.2500
1/4
E
.0079
92
0.20
.0980
40
.2520
6.40
.0083
91
0.21
.0984
2.50
.2559
6.50
.0087
90
0.22
.0995
39
.2570
F
.0091
89
0.23
.2598
6.60
.0095
88
.1015
38
.2610
G
.0098
0.25
.2638
6.70
.0100
87
.1024
2.60
.2656
17/64
.0105
86
.1040
37
.2567
6.75
.0110
85
0.28
.1063
2.70
.2660
H
.0115
84
.1065
36
.2677
6.80
.0118
0.30
.1083
2.75
.2717
6.90
.0120
83
.1094
7/64
.2720
I
.0125
82
.1100
35
.2756
7.00
.0126
0.32
.1102
2.80
.2770
J
.0130
81
.1110
34
.2795
7.10
.0135
80
.1130
33
.2810
K
.0138
0.35
.1142
2.90
.2812
9/32
.0145
79
.1160
32
.2835
7.20
.0150
0.38
.1181
3.00
.2854
7.25
.0156
1/64
.1200
31
.2874
7.30
.0157
0.40
.1220
3.10
.2900
L
.0160
78
.1250
1/8
.2913
7.40
.0177
0.45
.1260
3.20
.2950
M
.0180
77
.1280
3.25
.2953
7.50
.0197
0.50
.1285
30
.2969
19/64
.0200
76
.1299
3.30
.2992
7.60
.0210
75
.1339
3.40
.3020
N
.0217
0.55
.3031
7.70
.0225
74
.1360
29
.3051
7.75
.0236
0.60
.1378
3.50
.3071
7.80
.0240
73
.1405
28
.3110
7.90
.0250
72
.1406
9/64
.3125
5/16
.0256
0.65
.1417
3.60
.3150
8.00
.0260
71
.1440
27
.3160
O
.0276
0.70
.1457
3.70
.3189
8.10
.0280
70
.1470
26
.3228
8.20
.0292
69
.1476
3.75
.3230
P
.0295
0.75
.1495
25
.3248
8.25
.0310
68
.1496
3.80
.3268
8.30
.0312
1/32
.1520
24
.3281
21/64
.0315
0.80
.1535
3.90
.3307
8.40
.0320
67
.1540
23
.3320
Q
.0330
66
.1562
5/32
.3346
8.50
.0335
0.85
.3386
8.60
.0350
65
.1570
22
.3390
R
.0354
0.90
.1575
4.00
.3425
8.70
.0360
64
.1590
21
.3438
11/32
.0370
63
.1610
20
.3445
8.75
.0374
0.95
.1614
4.10
.3465
8.80
.0380
62
.1654
4.20
.3480
S
.0390
61
.1660
19
.3504
8.90
.0394
1.00
.1673
4.25
.3543
9.00
.0400
60
.1693
4.30
.3580
T
.0410
59
.1695
18
.3583
9.10
.0413
1.05
.1719
11/64
.3594
23/64
.0420
58
.1730
17
.3622
9.20
.0430
57
.1732
4.40
.3642
9.25
.0433
1.10
.3661
9.30
.0453
1.15
.1770
16
.3680
U
.0465
56
.1772
4.50
.3701
9.40
.0469
3/64
.1800
15
.3740
9.50
.0472
1.20
.1811
4.60
.3750
3/8
.0492
1.25
.1820
14
.3770
V
.0512
1.30
.1850
13
4.70
.3780
9.60
.0520
55
.1870
4.75
.3819
9.70
.0531
1.35
.1875
3/16
.3839
9.75
.0550
54
.1890
12
4.80
.3858
9.80
.0551
1.40
.1910
11
.3860
W
.0571
1.45
.1929
4.90
.3898
9.90
.0591
1.50
.1935
10
.3906
25/64
.0595
53
.1960
9
.3937
10.00
.0610
1.55
.1969
5.00
.3970
X
.0625
1/16
.1990
8
.4040
Y
.0630
1.60
.2008
5.10
.4062
13/32
.0635
52
.4130
Z
.0650
1.65
.2010
7
.0669
1.70
.2031
13/64
.0670
51
.2040
6
.0689
1.75
.2047
5.20
.0700
50
.2055
5
.0709
1.80
.2067
5.25
.0728
1.85
.2087
5.30
.0730
49
.2090
4
.0748
1.90
.2126
5.40
.0760
48
.2130
3
.0768
1.95
.2165
5.50
.0781
5/64
.2188
7/32
.0785
47
.2205
5.60
.0787
2.00
.2210
2
.0807
2.05
.2244
5.70
.0810
46
.2264
5.75
.0820
45
.2280
1
.0827
2.10
.2283
5.80
.0846
2.15
.2323
5.90
.0860
44
.2340
A
.0866
2.20
.2344
15/64
.0886
2.25
.2362
6.00
.0890
43
.2380
B
.0906
2.30
.2402
6.10
.0925
2.35
.2420
C
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