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Click Specification

(Non-preferred) dimensions in parentheses.

Unit:mm

Cross Recessed Raised Countersunk Head Screws

GB 820 - 1985

Display drawing:

国标GB 820 - 1985 GB820 820GB Cross Recessed Raised Countersunk Head Screws
Download CAD Model*
国标GB 820 - 1985 GB820 820GB Cross Recessed Raised Countersunk Head Screws
Download CAD Model*

 *Models with different eras.

Nominal Length L Tips:seclect Nominal Length L and get Thread length.
Screw Thread
d
M1.6 M2 M2.5 M3 M4 M5 M6 M8 M10
P Pitch
a max
dk theor. max
Actual max=nominal size
min
k max
x max
Socket No.
M1 Ref.
M2 Ref.
Penetration depth Type H min
max
Type Z min
max
0.35 0.4 0.45 0.5 0.7 0.8 1 1.25 1.5
0.7 0.8 0.9 1 1.4 1.6 2 2.5 3
3.6 4.4 5.5 6.3 9.4 10.4 12.6 17.3 20
3 3.8 4.7 5.5 8.4 9.3 11.3 15.8 18.3
2.7 3.5 4.4 5.2 8 8.9 10.9 15.4 17.8
1 1.2 1.5 1.65 2.7 2.7 3.3 4.65 5
0.9 1 1.1 1.25 1.75 2 2.5 3.2 3.8
0 0 1 1 2 2 3 4 4
1.9 2 3 3.4 5.2 5.4 7.3 9.6 10.4
2 2.2 3 3.8 5.2 5.6 7.2 9.6 10.4
0.9 1.2 1.5 1.8 2.7 2.9 3.5 4.75 5.5
1.2 1.5 1.85 2.2 3.2 3.4 4 5.25 6
0.95 1.15 1.5 1.8 2.65 2.9 3.4 4.75 5.6
1.2 1.4 1.75 2.1 3.1 3.35 3.85 5.2 6.05
Length of Thread b min
- - - - - - - - -

Alternative history

GB /T 820 - 1985 GB /T 820 - 2000 GB /T 820 - 2015

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  • Material: stainless steel, carbon steel; Nominal diameter: M1-M14; Nominal length: 5-400mm
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