DTI Washers

Direct tension indicators a special washer with raised nibs that are used to measure the tightening torque on a bolt, nut and washer assembly.

When the bolt and nut is tightened the nibs compress and a feeler guage is used to determine the required torque.

Also referred to as load indicating washers and HSFG washers they conform to EN14399-9 and be supplied in galvanised, sheradised or a self colour finish.

The main use is with EN14399 Pre loaded assembly bolts or HSFG high strength friction grip bolts and nuts.

DTI Washers

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Questions often asked about DTI washers.

What washers are used with HSFG bolts – DTI direct tension indicators or load indicating washers.

What are DTI washers –

  • What washers are used with HSFG bolts? – DTI direct tension indicators or load indicating washers.
  • What are DTI washers? – Steel washers with dimples or nibs that compress when tightened to the required torque.
  • What standard are DTIs made to? – Manufactured in accordance with EN14399-9
  • What is a load indicating washer? – This is the old name for DTI washers but essentially the same.
  • What finish do load indicators come in? – Commonly used in an oiled self coloured finish that can be left to rust without the risk of losing performance. Also available in sherdaised or a galvanised coating.
  • Where are DTI washers used? – Commonly used where there may be vibration or a greater loads where the torque needs to be accurate. Examples are sturctural steelwork, railway bridges, roof steels.

A whole range of washers are available to buy online from our web shop for a fast delivery.

Flat washers, spring washers, taper washers, shake-proof washer, square plate washers etc.

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