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QC/T 379-2013
Square head bolts
Nom
P
s max
s min
k
h
NPT1/8
27
5.5
5.32
9
15
NPT1/4
18
8
7.78
11
18
NPT3/8
18
10
9.78
12
20
NPT1/2
14
16
15.73
14
23
NPT3/4
14
18
17.73
16
26
NPT1
11.5
21
20.67
19
31
NPT1-1/4
11.5
24
23.67
20
34
NPT1-1/2
11.5
27
26.67
21
37
NPT2
11.5
34
33.38
21
39
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