TM 1-1500-204-23-6
Table 2-15. Helical Insert and Tools Data
Drill
Gauge
Insert tool
Tap (finish tap)
Minimum
Thread gauge
part No
tap
Tang
Class
depth
break-off
Drill
Rough
Class
2 or
nominal Class
Class
Class
tool
Extract
Nominal
hole
Minimum
tap
3
3B
length
2
3
3B
Pre-
(manual)
tool
thread
diameter
hole
part
part
part
of
part
part
part
winder Sleeve
part
part
size
min-max
depth4
No 1
No
No
insert
No
No.
No.
type2
type
No 3
No
Coarse Thread
1/4-20
.261-
.267
.225
186-4
187-4
4CPS
.175
788-4
188-4
1688-4
528-4
724-4
--
1227-6
5/26-18
.328-
.334
.250
186-5
187-5
5CPS
.195
788-5
188-5
1688-5
528-5
724-5
--
1227-6
3/8-16
.390-
.398
.281
186-6
187-6
6CPS
.219
788-6
188-6
1688-6
528-6
724-6
--
1227-6
7/16-14
.453-
.463
.322
186-7
187-7
7CPS
.250
788-7
188-7
1688-7
528-7
724-7
--
1227-16
1/2-13
.515-
.525
.346
186-8
187-8
8CPS
.269
788-8
188-8
1688-8
528-8
724-8
--
1227-16
9/16-12
.578-
.588
.375
186-9
187-9
9CPS
.292
788-9
188-9
1688-9
528-9
724-9-
--
1227-16
5/8-11
.653-
.663
.409
186-10
187-10
10CPS
.318
788-10
188-10
1688-10
528-10
724-10
--
1227-16
3/4-10
.781-
.791
.450
186-12
187-12
12CPS
.350
788-12
188-12
1688-12
528-12
724-12
1183-12
1227-16
7/8-9
.906-
.916
.500
186-14
187-14
14CPS
.389
788-14
188-14
1688-14
-
724-14
1183-14
1227-16
1-8
1.031-1 .044
.563
186-16
187-16
16CPS
.437
788-16
188-16
1688-16
-
724-16
1183-16
1227-16
Fine Thread
1/4-28
.257-
.264
.161
192-4
2193-4
4FPS
125
805-4
194-4
1694-4
535-4
733-4
--
1227-6
5/16-24
.323-
.330
.187
192-5
2193-5
5FPS
146
805-5
194-5
1694-5
535-5
733-5
--
1227-6
3/8-24
.385-
.392
.188
192-6
2193-6
6FPS
146
805-6
194-6
1694-6
535-6
733-6
--
1227-6
7/16-20
.450-
.458
.225
192-7
193-7
7FPS
175
805-7
194-7
1694-7
535-7
733-7
--
1227-16
1/2-20
.513-
.522
.225
192-8
193-8
8FPS
175
805-8
194-8
1694-8
535-8
733-8
--
1227-16
9/16-18
.577-
.586
.250
192-9
193-9
9FPS
195
805-9
194-9
1694-9
535-9
733-9
--
1227-16
5/8-18
.640-
.649
.250
192-10
193-10
1 OFPS195
805-10
194-10
1694-10
535-10
733-10
--
1227-16
3/4-16
.765-
.775
.281
192-12
193-12
12FPS
.219
805-12
194-12
1694-12
535-12
733-12
1184-12
1227-16
7/8-14
.890-
.900
.321
192-14
193-14
14FPS
.250
805-14
194-14
1694-14
535-14
733-14
1184-14
1227-16
1-14
1 015- 1.025
.321
192-16
193-16
16FPS
.250
805-16
194-16
1694-16
535-16
733-16
1184-16
1227-16
1
Use of rough tap Is optional.
2
Use sleeve type insert tool for installation of coarse thread insert larger than 3/4-10 thread size.
3
For through hole only.
4
Minimum drill hole depth equals nominal length of insert plus the given dimension.
2-63
