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(Non-preferred) dimensions in parentheses.

Cross recessed oblate head tapping screws with common screw-thread

SJ 2504 - 1984

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原电子工业部SJ 2504 - 1984 SJ2504 2504SJ Cross recessed oblate head tapping screws with common screw-thread
Screw Thread
d
ST2 ST2.5 ST3 (ST3.5) ST4.0 ST5 ST6
P Pitch
a max
dk max
min
k max
min
dp max
min
y max
Socket No.
M
Insert Depth/max
Insert Depth/min
r min
R
0.4 0.45 0.5 0.6 0.7 0.8 1
0.8 0.9 1 1.2 1.4 1.6 2
4.5 5.7 6.9 8.1 9.4 11.8 14
4.1 5.3 6.4 7.6 8.9 11.2 13.7
1.3 1.6 2.05 2.35 2.65 3.25 3.9
1.1 1.4 1.75 2.05 2.35 2.95 3.5
1.37 1.80 2.22 2.57 2.93 3.78 4.50
1.23 1.63 2.02 2.37 2.67 3.48 4.17
1.6 1.8 2.0 2.4 2.8 3.2 4.0
1 1 1 2 2 2 3
2.2 2.5 2.9 3.9 4.2 4.9 6.2
1.01 1.32 1.72 1.83 2.13 2.83 2.86
0.65 0.95 0.34 1.3 1.6 2.29 2.31
0.1 0.1 0.1 0.1 0.2 0.2 0.25
3 3.7 4.6 5.4 6.1 7.7 9.1

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