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GB /T 840 - 1988 Plastic diamond knurlhead screws


Unit: 毫米(mm)
L
Thread Size
d
M4 M5 M6
P pitch
dk
k
dp max
min
z max
min
R
0.7 0.8 1
12 16 20
5 6 6
2.5 3.5 4
2.25 3.2 3.7
2.25 2.75 3.25
2 2.5 3
25 32 40
per 1000 units ≈ kg(7.85kg/cm3)
- - -
Alternative history GB 840-1979 GB /T 840 - 1988

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