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Click Specification

(Non-preferred) dimensions in parentheses.

Cross Recessed Countersunk Head Thread Rolling Screws

GB /T 6561 - 2014

Display drawing:

国标GB /T6561 - 2014 GB6561 6561GB Cross Recessed Countersunk Head Thread Rolling Screws
Nominal Length L Tips:seclect Nominal Length L and get Thread length.
Screw Thread
d
M2 M2.5 M3 M4 M5 M6 M8 M10
P Pitch
a max
b min
dk Theoretical max
Actual max=nominal size
min
k max=nominal size
r max
x max
Socket No.
M1 Ref.
Penetration depth Type H max
min
M2 Ref.
Penetration depth Type Z max
min
0.4 0.45 0.5 0.7 0.8 1 1.25 1.5
0.8 0.9 1 1.4 1.6 2 2.5 3
25 25 25 38 38 38 38 38
4.4 5.5 6.3 9.4 10.4 12.6 17.3 20
3.8 4.7 5.5 8.4 9.3 11.3 15.8 18.3
3.5 4.4 5.2 8.04 8.94 10.87 15.37 17.78
1.2 1.5 1.65 2.7 2.7 3.3 4.65 5
0.5 0.6 0.8 1 1.3 1.5 2 2.5
1 1.1 1.25 1.75 2 2.5 3.2 3.8
0 1 1 2 2 3 4 4
1.9 2.7 2.9 4.6 4.8 6.6 8.7 9.6
1.2 1.55 1.8 2.6 2.8 3.3 4.4 5.3
0.9 1.25 1.4 2.1 2.3 2.8 3.9 4.8
1.9 2.5 2.8 4.4 4.6 6.3 8.5 9.4
1.2 1.47 1.73 2.51 2.72 3.18 4.32 5.23
0.95 1.22 1.48 2.06 2.27 2.73 3.87 4.78
Length of Thread b
- - - - - - - -

Alternative history