Study Of A Pre Tensioned Bolt

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Study Of A Pre Tensioned Bolt

Product Code: AEM022

Study Of A Pre Tensioned Bolt Manufacturer

Study Of A Pre Tensioned Bolt

Analysis can be made of the stresses and strains produced in a bolt after different methods of tightening, and allows modelling of the behaviour of a bolted connection when axially loaded.

Teaching objectives

The apparatus allows the following experiments:

  • Deformations in a bolt after tightening with a spanner or with a torque wrench.
  • Effect of bolt pre-tensioning using a hydraulic loading system.
  • Effect of varying the loading position.
  • Effect of varying the materials on the loading torque.
  • Static analysis of sliding with friction on a helical screw contact surface or plane.
  • Simple loading and stresses on a plane section.
  • Mohr’s Circles of stress, principal stresses and their directions.

Technical specifications

The pre-loaded bolt assembly is composed of :

  • A 16mm bolt on which are fixed three pairs of diametrically opposed 45° strain. These permit the measurement of extension and tension in the bolt.
  • A tubular component with 2 strain gauges mounted at 180° to measure the compression in the assembly at different heights.
  • A loading tube to apply bolt pre-load or to apply loading force at various positions along the bolted assembly.
  • A manually operated hydraulic pump.
  • A micrometer dial gauge to measure extensions over the complete assembly.
  • Nuts and washers of various materials.

Equipment Package :

  • Pre-loaded bolt assembly with hydraulic loading system and manual pump.
  • A set of washers.
  • Technical manual and teaching notes.


Dimensions and weight

  • 15 diam. x 37 cm – 12 kg
  • Pump: 40 x 10 x 14 mm – 3,5kg


Essential requirements

  • Electrical supply : 220V, 50 Hz

Additional required equipment :

  • Extensometer bridge.
  • A ring spanner 24 mm.
  • A torque wrench of capacity 40 – 200 Nm with 24 mm nut.
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