B1 example project
software results excerpt
The saved example shows how the inputs, assembly preload and applicable checks relate.
Development version example · draft preview of calculation bookThis technical extract presents saved results from the B1 example in TD Axiom. The values match the original software report, and the web page does not rerun the solver. The report was generated on 2026-10-10 at 10:17:37 (UTC+08:00). Its status is “Draft (not for formal release)” because a required engineering drawing is missing.
1. Main inputs
| engineering quantity | current input | corresponding meaning |
|---|---|---|
| bolt specifications | M12 × 1.75 | Nominal diameter 12 mm, pitch 1.75 mm |
| Bolt performance grade | 10.9 | Strength input: Rm = 1040 MPa, Rp0.2 = 940 MPa |
| Bolt elastic modulus | 205000 MPa | Material calculation input |
| clamping length | 42 mm | connection geometry input |
| Thread Stress Cross-sectional Area | 84.266368 mm² | computing input |
| Maximum axial working load | 24946.209 N | Fatigue load range: 0 ～ 24946.209 N |
| Maximum lateral working load | 0 N | R12 lateral load transfer verification is not applicable for this operating condition. |
| Minimum thread / support surface friction coefficient | 0.10 / 0.10 | Friction coefficient used in assembly calculation |
| tightening coefficient | 1.8 | Assembly calculation input |
| Existing total engagement length | 18 mm | Compare with the total engagement length required for calculation |
2. Assembly and working load results
| step | result quantity | software saved value |
|---|---|---|
| R5 | Minimum required assembly preload | 26968.199 N |
| R6 | estimated maximum assembly preload | 48542.758 N |
| R7 | allowable assembly preload | 64800 N |
| R4 | Preload loss caused by embedding | 2414.241 N |
| R3.4 | Load factor Φ used in this result | 0.055810141 |
| R8 | Maximum additional bolt axial load | 1392.251446 N |
| R13 | Allow tightening torque corresponding to the preload | 108 N·m (this value is selected from the table) |
this software report is based onAllow for preloading of 64800 N.for the operating limit check. Adding the maximum additional bolt load of 1392.251446 N gives a maximum axial bolt force of 66192.25145 N. The operating equivalent stress of 819.33152 MPa and bearing face pressure of 594.55797 MPa apply to that check. They cannot be read as the stress or pressure at the estimated maximum assembly preload of 48542.758 N.
3. Applicable safety and function checks
| step | verification content | actual value | requirement / allowable value | Safety / Margin coefficient | software determination |
|---|---|---|---|---|---|
| R7 | assembly preload | 48542.758 N | ≤ 64800 N | 1.3349056 | through |
| R8 | Working state reduced stress | 819.33152 MPa | ≤ 940 MPa | 1.1472767 | through |
| R9 | Fatigue Stress Range | 8.261015 MPa | ≤ 48.875 MPa | 5.9163432 | through |
| R10 | supporting surface pressure | 594.55797 MPa | ≤ 1300 MPa | 2.1864983 | through |
| R11 | total engagement length | 18 mm | ≥ 12.706832 mm | 1.4165608 | through |
| R12 | lateral load transfer | 0 N | Not applicable for this operating condition | — | not applicable |
All factors are from the saved software results. R11 compares the available total engagement length with the required total engagement length. R12 does not govern overall verification because this load case has no transverse load. R8 is the governing applicable check.
4. Scope of the results
These results apply to the materials, geometry, contact, loads, tightening method and calculation branch used in this example. Run the checks with the inputs for the actual project and review the full calculation report. The interactive friction coefficient and external load examples on the site are separate demonstrations and do not change the saved B1 results.
This page is a technical extract of calculation inputs and results. The original report requires the missing engineering drawing and a review before formal release.