# Reaction force on bolt (SPRINGA element)

**URL:** <https://prepomax.discourse.group/t/reaction-force-on-bolt-springa-element/3581>\
**Category:** General Questions\
**Tags:** results\
**Created:** [July 24, 2026, 10:29am UTC](https://prepomax.discourse.group/t/reaction-force-on-bolt-springa-element/3581 "2026-07-24T10:29:07Z")\
**Posts on this page:** 1\
**Showing post:** 9

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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:** [July 27, 2026, 10:05am UTC](https://prepomax.discourse.group/t/reaction-force-on-bolt-springa-element/3581/9 "2026-07-27T10:05:47Z")

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PrePoMax crashes for me when I try to make custom keywords active, but I see that you are trying to define a quadratic (3-node) beam element using only 2 nodes:

```auto
*ELEMENT, TYPE=B32, ELSET=beam_1
9000001, 42733, 42735

*ELEMENT, TYPE=B32, ELSET=beam_2
9000002, 42737, 42739

```

You need to add nodes in the middle with \*NODE. See the syntax here: [Simplified bolt connection with beam element and rigid constraints - #3 by qfontaine](https://prepomax.discourse.group/t/simplified-bolt-connection-with-beam-element-and-rigid-constraints/3328/3)

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