ORDINARY BOLTS AND NUTS


Some useful information regarding bolts, nuts and washers.

Table 1.1

Mechanical Properties of Bolts

  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

None

None

None

None

None

None

0.2% proof stress

(MPa)

Nominal

Minimum

None

None

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.jpg


  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.jpg

    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.jpg

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