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Bolt Science Web Site

Poster - Why nuts and bolts can self-loosen About Us Our Software Our Services Training Software Download Pricing Contact Us NEWS: BOLTCALC Version 6 is released. Online Training at www.bolting.info Click for details. Info on Bolting Glossary of Terms Bolting FAQ Tightening Methods Checking Tightness Torque Tightening Bolt Loosening Fastener Strength Bolting & Gaskets Joint Decompression Tight...

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Examples of Bolt Failures M12 Bolt Fretting Failure Failure of several M12 bolts occurred as a result of a design problem on a commercial vehicle. The bolts secured a crossmember that sustained loading from the vehicle suspension to the main longitudinal channel sections. The threads of the bolts were coated with an anaerobic adhesive that prevented any possibiliity of the nut rotating loose. The ...

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Failure Examples

Examples of Bolt Failures M24 Engine Mounting Bolt Failure Bending fatigue failure of a M24 strength grade 8.8 engine mounting bolt. The bolt was 220mm long and was used to secure one the mounts of an engine to a supporting structure. The bolt was tightened using a torque prevailing nut and additionally used a split pin in an attempt to ensure the bolt did not come loose. This failure was due to a...

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Examples of Bolt Failures M16 Flanged Bolt Failure Failure of a M16 flanged fastener of strength grade 12.9. This fastener failed as a result of fatigue failure. Following a detailed investigation of the assembly, the torque specification was too low. The torque specified was 180 Nm that resulted in a preload of 71000 N. This preload was insufficient to prevent the forces applied to the bolt openi...

http://www.boltscience.com/pages/failure2.htm

Short Bolting

Information on 'Short Bolting' Short bolting is a term frequently used to describe the situation when a bolt is installed and the thread does not fully protrude through the nut. In order that the full strength of the nut is to be realised, it is vital that the bolt thread protrude through the nut. Failure to do so runs the risk that thread stripping will occur. It is common practice to specify tha...

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