Information related to Bolted Joints
Presented below are links to pages on specific topics related
to bolted joint technology.We specialise in this subject and
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problems related to bolted joints. Please contact
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articles on bolting related matters
The Bolt Science Quiz on Bolting
of fastener and related terms
Convertor - Conversion program for torque units
of Tightening Bolts
Tightening and Quality Control
Study - Torque Tightening
Jost Effect - Why nuts and bolts come loose!
of Threaded Fasteners
Joints containing Gaskets
Importance of Preload - The Joint Decompression Point
Crosstalk and the need for a Tightening Sequence
the Nut or the Bolt Head
of Two Nuts to Prevent Self Loosening
of nuts and bolts
When is a back-up wrench needed?
Is a torque value really needed?
Should there be a tolerance on a torque value?
on the theory of Bolted Joints
is a bolt's preload force vital?
a bolted joint sustains an applied force
is a Joint Diagram?
Diagram with an external force applied
effect of a high external force on a joint
effect of a compressive external force on a joint
Effect of Joint Deformation loss due to Embedding
Preload Variation due to the Tightening Method
Joint Analysis using Preload Requirement Charts
nuts and bolts come loose
on why nuts and bolts can come loose
- Junker Fastener Vibration Test
on the double nut system of locking
on helical spring washers
of Threaded Fasteners
Non-Rotational Loosening of Nuts and Bolts
Preload Loss from Embedding in Bolted Joints
Preload Loss from Stress Relaxation in Bolted Joints
related to screw threads
background to screw threads
Whitworth Thread Form
British Association Thread Form
Unified and Metric Thread Forms
Profile of Unified and Metric Thread Forms
of Screw Threads
of bolt failures
Engine Mounting Bolt Failure
Bolt Fretting Failure
Bolting - Ensuring sufficient thread engagement
Effect of Nut Face Angularity on Bolt Fatigue Life
Bolt Science Blog
of a technical paper titled 'Self loosening of prestressed
of a technical paper titled 'Prevention of failures of high
strength fasteners in use in offshore and subsea applications'
about Torque by George Lorimer
for Fastening by George Lorimer
Bolts & Relaxation by George Lorimer
in Rome by George Lorimer
on Relaxation by George Lorimer
Thoughts on Fastening by George Lorimer
versis Torque+Angle Tightening - a case study by George Lorimer
and Other Material
on a Junker Transverse Vibration Test on Fasteners
2021 August Newsletter - Historical Background of Screw Threads
2021 July Newsletter - The Effect of Joint Face Angularity on the Fatigue Life of Bolts
2021 June Newsletter - Non-rotational Loosening - Part 3 - Stress Relaxation Loss
2021 May Newsletter - Non-rotational Loosening - Part 2 - Preload Loss from Embedding
2021 April Newsletter - Non-rotational Loosening of Threaded Fasteners
2021 March Newsletter - Is a Torque Value Really Needed?
2021 February Newsletter - Understanding how much thread should protrude past the nut
2021 January Newsletter - Background to Bolt Science and a new feature, Ask a Question
2020 November Newsletter - Should there be a tolerance on a torque value?
2020 October Newsletter - What is short bolting?
2020 September Newsletter - Tightening bolts past their yield point
2020 August - Vibrational Detachment of Threaded Fasteners
2020 July - How do we know what size of bolt to use?
2020 May - When is a back-up wrench needed?
2020 April - The use of two nuts to lock a fastener
2020 March - Fatigue Failure of an M16 Flanged Bolt
2020 January - A new approach to the tightness checking of bolts
2019 December - Problem with loose screws
2019 November - New Thoughts on Hydrogen Embrittlement of 10.9 Bolts