Taps & Dies
TAPS & DIES
176
Tap & Drill Selection Chart
Diam/
Type
Decimal
Equiv.
Fractional
Tap
Pipe
Tap
Metric
Tap
Screw
Ext.
G
.2610
17/64"
.2656
8
mm - 1.25
H
.2660
I
.2720
5/16"-24
NF
7.0
mm .2756
8
mm - 1.00
J
.2770
8
mm - 1.00
K
.2810
9/32"
.2812
5/16"-32
NEF
L
.2900
M
.2950
7.5
mm .2953
19/64"
.2969
EX-5
N
.3020
9
mm - 1.25
5/16"
.3125
3/8"- 16
NC
ST-4
8.0
mm .3150
9
mm - 1.00
O
.3160
9
mm - 1.00
P
.3230
9
mm - 0.75
21/64"
.3281
1/8" - 28
BSP
Q
.3320
3/8"- 24
NF 1/8" - 27 NPT
8.5
mm .3346
10
mm - 1.50
R
.3390
10
mm - 1.50
11/32"
.3438
10
mm - 1.25
S
.3480
9.0
mm .3543
10
mm - 1.00
T
.3580
10
mm - 1.00
23/64"
.3594
U
.3680
7/16"- 14
NC
9.5
mm .3740
11
mm - 1.50
3/8"
.3750
11
mm - 1.50 ST-5
V
.3770
W
.3806
25/64"
.3906
7/16"- 20
NF
10.0
mm .3937
X
.3970
Y
.4040
13/32"
.4062
12
mm - 1.75 EX-6
Z
.4130
12
mm - 1.50
10.5
mm .4134
12
mm - 1.50
27/64"
.4219
1/2"- 13
NC
12
mm - 1.25
11.0
mm .4331
7/16"
.4375
1/4" - 18
NPT
11.5
mm .4528
29/64"
.4531
1/2"-20
NF
1/2"-24
NS 1/4" - 19 BSP
15/32"
.4688
14
mm - 2.00 ST-6
12.0
mm .4724
14
mm - 2.00
31/64"
.4844
9/16" - 12
NC
12.5
mm .4921
14
mm - 1.50
Diam/
Type
Decimal
Equiv.
Fractional
Tap
Pipe
Tap
Metric
Tap
Screw
Ext.
1/2"
.5000
14
mm - 1.25
14
mm - 1.50
13.0
mm .5118
14
mm - 1.25
33/64"
.5156
9/16"- 18
NF
17/32"
.5313
5/8" - 11
NC
EX-7
35/64"
.5469
16
mm - 2.00
9/16"
.5625
3/8" - 18
NPT
ST-7
37/64"
.5781
5/8"- 18
NF
16
mm - 1.50
19/32"
.5938
11/16"-11
NS
39/64"
.6094
18
mm - 2.50
5/8"
.6250
11/16"-16
NS
41/64"
.6406
21/32"
.6562
3/4" - 10
NC
18
mm - 1.50
43/64"
.6719
11/16"
.6875
3/4" - 16
NF
20
mm - 2.50
45/64"
.7031
1/2" - 14
NPT
23/32"
.7188
47/64"
.7344
3/4"
.7500
49/64"
.7656
25/32"
.7812
7/8" - 9
NC
51/64"
.7969
13/16"
.8125
7/8" - 14
NF
22
mm - 1.50 EX-8
53/64"
.8281
24
mm - 3.00
27/32"
.8438
55/64"
.8594
7/8"
.8750
1" - 8
NC
24
mm - 2.00
57/64"
.8906
29/32"
.9062
59/64"
.9219
1" - 12
NF
3/4" - 14
NPT
15/16"
.9375
1" - 14
NS
61/64"
.9531
31/32"
.9688
63/64"
.9844
1-1/8"- 7
NC
1"
1.0000
1-1/64"
1.0156
1-1/32"
1.0312
1-1/16"
1.0625
EX-9
1-3/32"
1.0938
1-1/8"
1.1250
1-5/32"
1.1562
1" - 11-1/2"
NPT
1-3/16"
1.1875
1-1/4"
1.2500
1-5/16"
1.3125
1-3/8"
1.3750
1-7/16"
1.4375
1-1/2"
1.5000
1-1/4" -
11-1/2"
NPT