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Unit:mm

Hexagon Head Bolts - Full Thread - Product Grade C

GB 5781 - 1986

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国标GB 5781 - 1986 GB5781 5781GB Hexagon Head Bolts - Full Thread - Product Grade C
Download CAD Model*

 *Models with different eras.

Screw Thread
d
M5 M6 M8 M10 M12 M16 M20 M24 M30 M36 M42 M48
P Pitch
a max
min
e min
k Nominal Size
min
max
s max=nominal size
min
0.8 1.0 1.25 1.5 1.75 2 2.5 3.0 3.5 4.0 4.5 5.0
3.2 4 5 6 7 8 10 12 14 16 13.5 15
/ / / / / / / / / / 4.5 5
8.63 10.89 14.20 17.59 19.85 26.17 32.95 39.55 50.85 60.79 72.02 82.6
3.5 4 5.3 6.4 7.5 10 12.5 15 18.7 22.5 26 30
3.12 3.62 4.92 5.95 7.05 9.25 11.6 14.1 17.65 21.45 24.95 28.95
3.88 4.38 5.68 6.85 7.95 10.75 13.4 15.9 19.75 23.55 27.05 31.05
8 10 13 16 18 24 30 36 46 55 65 75
7.64 9.64 12.57 15.57 17.57 23.16 29.16 35 45 53.8 63.8 73.1
Screw Thread
d
M55 M64 (M14) (M18) (M22) (M27) (M33) (M39) (M45) (M52) (M60)
P Pitch
a max
min
e min
k Nominal Size
min
max
s max=nominal size
min
5.5 6.0 2.0 2.5 2.5 3.0 3.5 4.0 4.5 5.0 5.5
16.5 18 6 7.5 7.5 9 10.5 12 13.5 15 16.5
5.5 6 2 2.5 2.5 3 3.5 4 4.5 5 5.5
93.56 104.86 22.78 29.56 37.29 45.2 55.37 66.44 76.95 88.25 99.21
35 40 8.8 11.5 14 17 21 25 28 33 38
33.75 38.75 8.35 10.6 13.1 16.1 19.95 23.95 26.95 31.75 36.75
36.25 41.25 9.25 12.4 14.9 17.9 22.05 26.05 29.05 34.25 39.25
85 95 21 27 34 47 50 60 70 80 90
82.8 92.8 20.16 26.16 33 40 49 58.8 68.1 78.1 87.8

Alternative history

GB 5781 - 1986 GB /T 5781 - 2000 GB /T 5781 - 2016
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