While discussing bolts and washers for a connection detail with the team leader, he mentioned DTI washers in the conversation.
What is DTI Washer?
DTI washers, also known as load indicating washers or torque control washers, are specialized washers designed to provide a visual indication of bolt tension during the tightening process. They feature convex ridges that contain small pockets of bright orange silicone.
How does it work:
DTI washers are installed the same way as normal washers. During tightening, the ridges resist until the required compression is achieved. At that point, the ridges compress and force the silicone out of the cavity. This allows the erector to immediately know if bolts are tightened to the correct tension, eliminating the need for gauges or extra measures to ensure tightness.
Where is it used:
DTI washers are used in connections where specific tension levels are needed. They are commonly used in various applications, including:
- Bolted Connections in Structural Steel Frames
- Bridge Construction
- Steel Roof Truss Systems
- Steel Plate Girder Bridges
- Steel Pipe Supports and Hangers
Sources:
https://www.thesteelsupplyco.com/blog/direct-tension-indicator-washers
https://www.vihasteel.com/dti-washer-direct-tension-indicator.html
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