GB /T 6561 - 1986 Cross recessed countersunk head thread forming screws


Unit: mm
国标GB /T6561 - 1986 GB6561 6561GB Cross recessed countersunk head thread forming screws
Nominal Length L Tips:seclect Nominal Length L and get Weight .
Screw Thread
d
M2.5 M3 M4 M5 M6
P Pitch
a max
b min
dk max
min
k max
Socket No.
m Ref.
Penetration depth min
max
x max
0.45 0.5 0.7 0.8 1
0.9 1 1.4 1.6 2
12 18 24 30 35
4.7 5.5 8.4 9.3 11.3
4.4 5.2 8 8.9 10.9
1.5 1.65 2.7 2.7 3.3
1 1 2 2 3
2.9 3.2 4.6 5.2 6.8
1.4 1.7 2.1 2.7 3
1.8 2.1 2.6 3.2 3.5
1.1 1.25 1.75 2 2.5
Weight of per 1000 steel products(≈kg)
- - - - -
Alternative history
Similar Standards
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