Optimum Optiturn TU 2506 Operating Manual page 136

OPTIMUM
M A S C H I N E N - G E R M A N Y
BSPT: BSPT: British Standard Pipe - Taper Thread. Conic tube thread, cone 1:16; designation:
1/4" - 19 BSPT
BA: BA: British Association Standard Thread (47 1/2° flank angle). Common with instruments
and watches, is being replaced by the metric ISO thread and by the ISO miniature thread. It
consists of numeric designations from 25 to 0=6.0 mm max diameter.
Table of the British threads
Nominal diameter of
the thread
[Inch] mm
1/16 1.588
3/32 2.382
1/8 3.175
5/32 3.970
3/16 4.763
7/32 5.556
1/4 6.350
9/32 7.142
5/16 7.938
3/8 9.525
7/16 11.113
1/2 12.700
9/16 14.288
5/8 15.875
11/16 17.463
3/4 19.051
13/16 20.638
7/8 22.226
15/16 23.813
1 25.401
1 1/8 28.576
1 1/4 31.751
1 3/8 34.926
1 1/2 38.101
1 5/8 41.277
1 3/4 44.452
1 7/8 47.627
2 50.802
GB TU2506 | TU2506V | TU2807 | TU2807V
Page 136
Threads in 1"
BSW BSF: BSP/BSPT
(R)
55° Flank angle
60 - -
48 - -
40 - 28
32 - -
24 32 -
24 28 -
20 26 19
20 26 -
18 22 -
16 20 19
14 18 -
12 16 14
12 16 -
11 14 14
11 14 -
10 12 14
10 12 -
9 11 14
9 11 -
8 10 11
7 9 -
7 9 11
6 8 -
6 8 11
5 8 -
5 7 11
4 1/2 7 -
4 1/2 7 11
Original operating instructions
Threads in 1"
BA-threads
D. [mm] No.
47 1/2° Flank angle
16 134
15 121
9.73 14 110
- 13 102
- 12 90.9
- 11 87.9
13.16 10 72.6
- 9 65.1
- 8 59.1
16.66 7 52.9
- 6 47.9
20.96 5 43.0
- 4 38.5
22.91 3 34.8
- 2 31.4
26.44 1 28.2
- 0 25.3
30.20
-
33.25
-
41.91
-
47.80
-
53.75
-
59.62
D
[mm]
0.79
0.9
1.0
1.2
1.3
1.5
1.7
1.9
2.2
2.5
2.8
3.2
3.6
4.1
4.7
5.3
6.0
Version 1.0.1 2014-05-16