Ordinary bolts and nuts

Some useful information regarding bolts, nuts and washers.

Table 1.1

Mechanical Properties of Bolts

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Property Class
Property 4.8 8.8 d < 16 mm 8.8 d > 16 mm 10.9
Tensile strength (MPa) Nominal Minimum 400 420 800 800 800 800 1000 1040
Yield stress (MPa) Nominal Minimum 320 340 - - - - - -
0.2% proof stress (MPa) Nominal Minimum - - 640 640 640 660 900 940
Elongation at fracture (%) Minimum 14 12 12 9 - - - - -

Table 1.2

Basic Dimensions of Ordinary Bolts

bolts_nuts_drawing_1.PNG

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s according to e according to
d DIN ISO k ds (shank) DIN ISO
Min Max Min Max Nom Min Max p (pitch) Min Min
M12 18.67 19.0 17.67 18.0 7.50 11.73 12 1.75 21.10 20.03
M16 23.67 24.0 23.67 24.0 10.0 15.73 16 2.00 26.75 26.75
M20 29.67 30.0 29.67 30.0 12.5 19.67 20 2.50 33.53 33.53
M24 35.38 36.0 35.38 36.0 15.0 23.67 24 3.00 39.98 39.98
M30 45.0 46.0 45.0 46.0 18.7 29.67 30 3.50 50.85 50.85

Table 1.3

Basic Dimensions of Nuts for Ordinary Bolts

bolts_nuts_drawing_2.PNG

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s according to e according to m according to
DIN ISO DIN ISO DIN ISO
d

p

(pitch)

 Min Max Min Max Min Min Max Min Max Min
M12 1.75 18.67 19.0 17.73 18.0 21.10 20.03 10.0 9.64 10.80 10.37
M16 2.00 23.67 24.0 23.67 24.0 26.75 26.75 13.0 12.3 14.80 14.10
M20 2.50 29.16 30.0 29.16 30.0 32.95 32.95 16.0 14.9 18.00 16.90
M24 3.00 35.00 36.0 35.0 36.0 39.55 39.55 19.0 17.7 21.50 20.20
M30 3.50 45.00 46.0 45.00 46.0 50.85 50.85 24.0 22.7 25.60 24.30

Table 1.4

Dimensions of Washers for Ordinary Bolts

bolts_nuts_drawing_3

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Bolt Size d1 d2 t
M12 14.0 24.0 2.5
M16 18.0 30.0 3.0
M20 22.0 37.0 3.0
M24 26.0 44.0 4.0
M30 33.0 56.0 4.0
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