# Help with a bolted connection (pretensioned bolts, half symmetry and under thension

**URL:** <https://prepomax.discourse.group/t/help-with-a-bolted-connection-pretensioned-bolts-half-symmetry-and-under-thension/2787>\
**Category:** General Questions\
**Created:** [June 20, 2025, 8:42am UTC](https://prepomax.discourse.group/t/help-with-a-bolted-connection-pretensioned-bolts-half-symmetry-and-under-thension/2787 "2025-06-20T08:42:51Z")\
**Posts on this page:** 3\
**Page:** 2

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**Author:** ![Rdev](https://avatars.discourse-cdn.com/v4/letter/r/c6cbf5/32.png) [@Rdev](https://prepomax.discourse.group/u/Rdev)\
**Post date:** [June 14, 2026, 4:58pm UTC](https://prepomax.discourse.group/t/help-with-a-bolted-connection-pretensioned-bolts-half-symmetry-and-under-thension/2787/21 "2026-06-14T16:58:13Z")

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For Tied I am preparing the model. Trying it out.

For the surface interaction: type is Hard, and fric coeff is 0.1 and slope is 100000 N/mm³.

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**Author:** ![FEAnalyst](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/feanalyst/32/688_2.png) [@FEAnalyst](https://prepomax.discourse.group/u/FEAnalyst)\
**Post date:** [June 14, 2026, 4:59pm UTC](https://prepomax.discourse.group/t/help-with-a-bolted-connection-pretensioned-bolts-half-symmetry-and-under-thension/2787/22 "2026-06-14T16:59:31Z")

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Try switching Hard to Linear and reducing the stiffness (K) by a few orders of magnitude. You can use this formula to estimate it: [Snap-fit contact snagging problem - #17 by JuanP74 - Analysis issues - CalculiX (official versions are on www.calculix.de, the official GitHub repository is at https://github.com/Dhondtguido/CalculiX).](https://calculix.discourse.group/t/snap-fit-contact-snagging-problem/2277/17)

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**Author:** ![Rdev](https://avatars.discourse-cdn.com/v4/letter/r/c6cbf5/32.png) [@Rdev](https://prepomax.discourse.group/u/Rdev)\
**Post date:** [June 14, 2026, 5:01pm UTC](https://prepomax.discourse.group/t/help-with-a-bolted-connection-pretensioned-bolts-half-symmetry-and-under-thension/2787/23 "2026-06-14T17:01:48Z")

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Sure, I will try this and update you once I get some results for this.

Thanks for the quick response.

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