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GB 2674 - 1986 Hexagon lobular socket oval countersunk head screws


Unit: 毫米(mm)
Weight Calculator
L
Thread Size
d
M6 M8 M10
P Pitch
a max
b min
dk Theoretical max
Actual max=nominal size
min
f
k max=nominal size
Socket No. Socket No.
t max
min
B max
x max
1 1.25 1.5
2 2.5 3
38 38 38
12.6 17.3 20
11.3 15.8 18.3
10.9 15.4 17.8
1.4 2 2.3
3.3 4.65 5
T30 T40 T50
1.8 2.5 2.7
1.4 2.1 2.3
4.15 5 6.62
2.5 3.2 3.8
Thread Length
b
- - -
①,ds≈thread diameter
Alternative history GB /T 2674 - 1986 GB /T 2674 - 2004 GB /T 2674 - 2017
Equivalent standard
GB GB /T 2674
ISO ISO 14584
DIN DIN EN ISO 14584
Some of the above standards may be approximate equivalent. If there is any objection, the standard original shall prevail.

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