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
| 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
| 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
| 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 |
