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GB 839 - 1988 Knurled Thumb Screws with Waisted Shank


Unit: 毫米(mm)
L
Thread Size
d
M3 M4 M5
P pitch
ds max
min
dk before knurled max
min
k max
min
n Nominal Size
max
min
t min
b thread length
r min
h
B
R
c
c1
0.5 0.7 0.8
2 2.8 3.5
1.86 2.66 3.32
5 8 9
4.82 7.78 8.78
4.5 6.5 7
4.32 6.32 6.78
0.8 1.2 1.2
1 1.51 1.51
0.86 1.26 1.28
0.7 1.0 1.2
4 6 8
0.1 0.2 0.2
1 1.5 1.5
1 1.5 1.5
0.5 0.75 0.75
1 1.2 1.6
0.3 0.3 0.5
per 1000 units ≈ kg(7.85kg/cm3)
- - -
Alternative history GB 839-1976 GB /T 839 - 1988

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