| Symbol | d12.9 |
|---|---|
| Unit | mm |
| Attribute-ID | vdi_2230_pre_size_diameter_for_12p9 |
| Numeric ID | 19148 |
| Value Type | PMTechValue |
Using the bolt pre-dimensioning from VDI 2230 Table A7, possible nominal diameters for the bolt are recommended based on the load (axial force, shear force), the type of load (static/dynamic, centric/eccentric) and the tightening method (large/medium/no scatter) depending on the strength grade.
Proceed according to Table A7:
A - select next highest load to the loading acting on the bolted joint; with combined loading (longitudinal and transverse loads): FAmax < FQmax/µTmin then only FQmax is to be used
B1 - when designing with FQmax proceed with 4 steps for the load
B2 - when designing with FAmax proceed with 2 steps for dynamic and eccentrically applied axial load, 1
step for dynamically and concentrically or statically and eccentrically applied axial load,
or 0 steps
for statically and concentrically applied axial load
D - Recommended nominal diameters according to the strength grade
| Force in N |
Nominal diameter in mm |
||
| Strength grade | |||
| 12.9 | 10.9 | 8.8 | |
| 250 | - | - | - |
| 400 | - | - | - |
| 630 | - | - | - |
| 1000 | 3 | 3 | 3 |
| 1600 | 3 | 3 | 3 |
| 2500 | 3 | 3 | 4 |
| 4000 | 4 | 4 | 5 |
| 6300 | 4 | 5 | 6 |
| 10000 | 5 | 6 | 8 |
| 16000 | 6 | 8 | 10 |
| 25000 | 8 | 10 | 12 |
| 40000 | 10 | 12 | 14 |
| 63000 | 12 | 14 | 16 |
| 100000 | 16 | 18 | 20 |
| 160000 | 20 | 22 | 24 |
| 250000 | 24 | 27 | 30 |
| 400000 | 30 | 33 | 36 |
| 630000 | 36 | 39 | - |
Table from: VDI 2230 Part 1, VDI Verlag Düsseldorf, 2015, p. 117, "Table A7. Estimating the diameter range of bolts"
Example:
A - FAmax = 8500N, so the next higher force level is for FMmax = 10000N
B2 - dynamic and eccentric, thus 2 steps for 25000N
C - tightening with torque wrench, 1 step for 40000N
D - selecting strength grade 12.9 leads to a recommendation of bolt M10