DTI Washers also known as Direct Tension Indicators are 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 gauge is used to determine the required torque. Also referred to as load indicating washers and HSFG washers they conform to EN14399-9 and are supplied in galvanised, sheradised or a self colour finish. Their main use is with EN14399 Pre loaded assembly bolts or HSFG high strength friction grip bolts and nuts.
More Information on this product:
- They have dimples or nibs that compress when tightened to the required torque.
- Manufactured in accordance with the EN14399-9 standard.
- The finishes they come in vary, as they are available in galvanised, self colour and also sheradised. Generally they are most commonly in an oily self colour finish that can be left to rust without the risk of losing performance.
- Usually used where there may be vibration or a greater loads where the torque needs to be accurate. Examples are structural steelwork, railway bridges, and also roof steels.
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