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
have extensive knowledge and experience on the solution of
problems related to bolted joints. Please contact
us if you think we can be of assistance on a problem that
you are experiencing. Click on appropriate link for further
information on the subject.
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?
World Standards Day - The importance of standards to fasteners
What is the optimum value for the coefficient of friction of a threaded fastener?
The Reduced Loadability of DIN nuts
ISO68-1 The basic and design thread profiles
The Causes of Non-Linear Torque Tension Relationships during Tightening
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
Bolt Self-Loosening and the Critical Slip Distance
The importance of the grip length to bolt diameter ratio
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
2024 January Newsletter - Non-Linear Torque-Tension Relationships during Tightening
2023 November Newsletter - ISO 68-1 The Basics of the Metric Thread Form
2023 September Newsletter - Recent Update to ISO Nuts
2023 August Newsletter - The
Reduced Loadability of DIN compared to ISO Nuts
2023 July Newsletter - The Goldilocks Zone and the Coefficient of Friction of Fasteners
2023 June Newsletter - The Joint Decompression Point - Why Bolt Preload is Important!
2023 May Newsletter - What is a Residual Torque Measurement.
2023 April Newsletter - Case study of fastener issues causing a rail accident
2023 March Newsletter - Is it okay to use a mild steel nut with a high tensile bolt?
2023 February Newsletter - Bolt Preload Variation due to the Tightening Method
2023 January Newsletter - Some bolts are tightened past their yield point. Is this a problem?
2022 December Newsletter - What is the Best Way to Check the Torque Value on a Bolt?
2022 September Newsletter - World Standards Day
2022 August Newsletter - Quality Control in the Tightening of Bolts
2022 July Newsletter - The use of two-nuts to prevent self-loosening
2022 June Newsletter - Analysis for a Bolt Fatigue Failure in a Clevis Joint
2022 May Newsletter - Bolt Self-Loosening and the Critical Slip Distance
2022 April Newsletter - The Effect of Joint Face Angularity on the Fatigue Life of Bolts
2022 March Newsletter - Information on Screw Threads
2022 February Newsletter - When to use a back-up wrench
2022 January Newsletter - Helical Spring Lock Washers
2021 December Newsletter - Thread Stripping Case Studies
2021 November Newsletter - Case Study on a Bolt Self-Loosening Investigation
2021 October Newsletter - The Joint Decompression Point - Why Bolt Preload is Important!
2021 September Newsletter - Back to Basics - Why Bolt Preload is Important!
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
Social Media Links