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1. Standard of Coupling Products
Item
KSB
1533
STS
Socket
BS 1387
Socket
ISO 50R(DIN)
Socket
JIS
B2302
JIS C8330
Conduit Coupling
Threads
Number
per inch
ASTM A53
Coupling
ANSI C 80.1
(UL-6)
Consuit Coupling
Threads
Number
per inch
Dia & Length
Nominal Size
OD
L
OD
L
OD
L
OD
L
OD
L
SIZE
OD
L
OD
L
OD
L
8A
1/4B
18.5
25
17
25
18.5
27
18.5
28
18.5
28
19
18.26
28.58
18
10A
3/8B
21.3
26
21
26
22.0
28
21.3
26
21.3
26
19
22.23
28.58
22.2
32.90
18
15A
1/2B
26.4
34
25
33
27.0
37
26.4
34
26.4
34
16BC
25
38
14
27.00
38.10
25.7
41.30
14
20A
4/3B
31.8
36
31
36
32.5
39
31.8
36
31.8
36
22BC
31
44
14
33.35
39.69
31.8
42.86
14
25A
1B
39.5
43
38
43
39.5
46
39.5
43
39.5
43
28BC
37.5
50
11
40.03
49.22
38.7
50.80
111/2
32A
11/4B
48.3
48
47
48
49.0
51
48.3
48
48.3
48
36BC
48.5
56
11
48.26
50.80
47.5
52.39
111/2
40A
11/2B
54.5
48
53
48
56.0
51
54.5
48
54.5
48
42BC
54.5
56
11
55.88
50.80
54.7
52.39
111/2
50A
2B
66.3
56
66
56
68.0
60
66.3
56
66.3
56
54BC
68.0
64
11
69.85
52.39
67.3
54.00
111/2
65A
21/2B
82.0
65
82
65
84.0
69
82.0
65
82
65
70BC
84.0
72
11
82.55
77.79
82.6
81.00
8
80A
3B
95.0
71
95
70
98.0
71
95.0
71
95
71
82BC
97.0
80
11
101.60
80.97
98.3
84.20
8
90A
31/2B
110.0
92BC
110.0
85
11
117.48
84.14
114.3
87.32
8
100A
4B
122.0
83
121
84
124.0
122.0
83
122
83
104BC
123.5
90
11
127.00
87.32
123.8
90.49
8
125A
5B
147.0
92
151.0
147.0
92
147
92
11
159.92
93.67
152.4
101.60
8
150A
6B
174.0
92
178.0
174.0
92
174
92
11
187.71
100.02
182.2
107.95
8