Taps & Dies
800.866.5740
TAPS & DIES
175
Diam/
Type
Decimal
Equiv.
Fractional
Tap
Machine
Screw Tap
Metric
Tap
Screw
Ext.
1/64"
.0516
1/32"
.0312
1.0
mm .0394
60
.0400
59
.0410
58
.0420
57
.0430
56
.0465
3/64"
.0469
0 - 80
NF
55
.0520
54
.0550
1.5
mm .0591
53
.0595
1 - 64
NC
1 - 72
NF
1/16"
.0625
52
.0635
51
.0670
50
.0700
2 - 56
NC
2 - 64
NF
49
.0730
48
.0760
5/64"
.0781
3 - 48
NC
EX-1
47
.0785
2.0
mm .0787
46
.0810
45
.0820
3 - 56
NF
44
.0860
4 - 36
NS
43
.0890
4 - 40
NC
42
.0935
3/32"
.0938
4 - 48
NF
41
.0960
3
mm - 0.60
40
.0980
2.5
mm .0984
3
mm - 0.50
39
.0995
3
mm - 0.50
38
.1015
1/8" - 40
NS 5 - 40 NC
37
.1040
5 - 44
NF
36
.1065
6 - 32
NC
7/64"
.1094
EX-2
35
.1100
34
.1110
6 - 36
NS
33
.1130
6 - 40
NF
32
.1160
6 - 48
NS
3.0
mm .1181
31
.1200
1/8"
.1250
30
.1285
4
mm - 0.70
4
mm - 0.75
29
.1360
8 - 32
NC
8 - 36
NF
3.5
mm .1378
28
.1405
Diam/
Type
Decimal
Equiv.
Fractional
Tap
Machine
Screw Tap
Metric
Tap
Screw
Ext.
9/64"
.1406
8 - 40
NS
ST-1
27
.1440
26
.1470
3/16"-24
NS
25
.1495
10 - 24
NC
24
.1520
23
.1540
5/32"
.1562
3/16"-32
NS
EX-3
22
.1570
4.0
mm .1575
21
.1590
10 - 32
NF
20
.1600
5
mm - 0.90
19
.1660
5
mm - 0.80
18
.1695
11/64"
.1719
17
.1730
16
.1770
12 - 24
NC
4.5
mm .1772
15
.1800
14
.1820
12 - 28
NEF
13
.1850
3/16"
.1875
ST-2
12
.1890
11
.1910
10
.1935
14 - 20
NS
9
.1960
5.0
mm .1969
6
mm - 1.00
8
.1990
6
mm - 1.00
7
.2010
1/4" - 20
NC
13/64"
.2031
14 - 24
NS
6
.2040
5
.2055
4
.2090
1/4" - 24
NS
3
.2130
1/4" - 28
NF
5.5
mm .2165
7/32"
.2188
1/4"- 32
NEF
2
.2210
1
.2280
1/4" - 40
NS
A
.2340
15/64"
.2344
7
mm - 1.00 ST-3
6.0
mm .2362
7
mm - 1.00
B
.2380
C
.2420
D
.2460
E
.2500
1/4"
.2500
EX-4
6.5
mm .2559
F
.2570
5/16"- 18
NC
Tap & Drill Selection Chart
Machine Screw Reference Guide
Machine Screw
Rod Diameter
#0
.060"
#1
.073"
#2
.086"
#3
.099"
#4
.112"
#5
.125"
#6
.138"
Machine Screw
Rod Diameter
#7
.151"
#8
.164"
#9
.179"
#10
.190"
#12
.216"
#14
.242"
Before cutting a thread, you must
know the rod diameter.
Use the chart at right to determine
the appropriate machine screw size: