TM 1-1500-204-23-6
Table 2-16. Twinsert and Tools Data - CONT
Drill
Tap
Nominal
minor Dia.
Assembled
thread
after tap
Major Dia.
Pitch Dia.
pitch Dia.
size
min-max
min
min-max
min - max
National Fine Series
6-40
.176-
.182
1.998
.1868-
.1886
.1543-
.1569
10-32
.238-
.245
.2670
.2509-
.2530
.2103 -
.2133
1/4-28
.310-
.318
.3379
.3196-
.3219
.2732-
.2765
5/16-24
.375 -
.383
.4150
.3936-
.3964
.3395-
.3433
3/8-24
.435-
.443
.4776
.4561-
.4590
.4020-
.4059
7/16-20
.514-
.526
.5604
.5349-
.5383
.4700-
.4744
1/2-20
.576-
.588
.6231
.5974-
.6010
.5325-
.5371
Oversize kit part number
Twinsert kit part number
Nominal
size
Screw thread insert
Screw lock insert
Screw thread
Screw lock
National Coarse Series
4-40
3166-04
3170-04
3174-04
3176-04
5-40
3166-05
3170-05
3174-05
3176-05
6-32
3166-06
3170-06
3174-06
3176-06
8-32
3166-2
3170-2
3174-2
3176-2
10-24
3166-3
3170-3
3174-3
3177-3
12-24
3166-1
---
3174-1
3177-1
1/4-20
3166-4
3170-4
3174-4
3177-4
5/16-18
3166-5
3170-5
3174-5
3177-5
3/8-16
3166-6
3170-6
3174-6
3177-6
7/16-14
3166-7
3170-7
3174-7
3177-7
1/2-13
3166-8
3170-8
3174-8
3177-8
National Fine Series
6-40
3188-06
3172-06
3175-06
3178-06
10-32
3188-3
3172-3
3175-3
3179-3
1/4-28
3188-4
3172-4
3175-4
3179-4
5/16-24
3188-5
3172-5
3175-5
3179-5
3/8-24
3188-6
3172-6
3175-6
3179-6
7/16-20
3188-7
3172-7
3175-7
3179-7
1/2-20
3188-8
3172-8
3175-8
3179-8
1
Add assembly number to length (e g 3180-04CN + .168).
2-65
