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 TM 320 Screw Tester
 Technical Description

The main element of the unit is a slotted, elastically deformable steel block. By tightening the bolt joint, the slotted area is deformed, thereby generating an axial tension force in the bolt. The resulting deformation is recorded by a mechanical dial gauge, and is directly related to the bolt tension force generated. The bolt joint is tightened and slackened using a special torque wrench, which can be set sensitively with the aid of a threaded spindle. By using an axial bearing, the head friction of the bolt can be largely excluded, so that only the friction of the threaded joint is measured.
The well-structured instructional material sets out the fundamentals and provides a step-by-step guide through the experiments.

Learning Objectives / Experiments

- Axial tension force in a bolt joint dependent on the tightening torque or

the elastic deformation of a slotted block
- Measurement of the breakaway torque, including for different fitting

situations of the bolt joint
- Measurement of thread friction and overall friction

 Features

* Correlation between tightening torque and tension

force on standardised bolts1
* Breakaway torque of a bolt joint

 Alternative products
TM 310 -- Thread Efficiency Testing Equipment
 Specification [1] Experiment on the correlation between the tension force and tightening torque of bolts[2] Bolt size M8x100, wrench jaw size 13mm[3] Elastic deformation of a slotted block by the bolt[4] Determining the tightening and breakaway torque with a mechanical torque measuring device [5] 2 position dial gauges [6] Sensitive torque setting by hand wheel Technical Data Tension force: max. 40kNForce/travel constant: 20kN/mm (on slotted block)Max. tightening torque: 40NmTorque/travel constant: 10Nm/mm (on torque measuring device)Position dial gauge: 0...10mm, graduations: 0,01mm Dimensions and Weight l x w x h: 450x400x260mmWeight: approx. 27kg Scope of Delivery 1 bolt tester complete with switchable ratchet, 1 set of bolts in transparent container, 1 set of instructional material Order Details 040.32000  TM 320  Screw Tester