When you select Calculated tensile stress area (Connector-Bolt PropertyManager), the program calculates the tensile stress area (At), which is the mimimum area of the threaded section of the bolt, according to the formula: At = [(d3 + d2) / 2)]2 * π /4
Substituting P = 1 / n results to At = 0.7854 * [d – (0.9382 / n)]2, where d is given in mm, and n is given in threads/mm.
ANSI threads
A similar approach is followed for the calculation of the tensile stress area:
At = 0.7854 * [d – (0.9743 / n)]2, where d is given in inches, and n is given in threads/inch.
Reference: Machinery’s Handbook published by Industrial Press.
The table below provides the nominal bolt diameter and pitch values for the main ISO M large thread bolts.
| Nominal Diameter d (mm) | Pitch P (mm) |
|---|---|
| M 1.60 | 0.35 |
| M 2.00 | 0.40 |
| M 2.20 | 0.45 |
| M 3.00 | 0.50 |
| M 4.00 | 0.70 |
| M 4.50 | 0.75 |
| M 5.00 | 0.80 |
| M 6.00 | 1.00 |
| M 8.00 | 1.25 |
| M 10.00 | 1.50 |
| M 12.00 | 1.75 |
| M 16.00 | 2.00 |
| M 20.00 | 2.50 |
| M 24.00 | 3.00 |
| M 30.00 | 3.50 |
| M 36.00 | 4.00 |
| M 42.00 | 4.50 |
| M 48.00 | 5.00 |
| M 56.00 | 5.50 |
| M 64.00 | 6.00 |
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