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On a Misleading Note?
Posted by Geoff Weisenberger on October 1, 2007 at 9:36 AM.

Zoruba and Liddy did an excellent job of outlining the specifications relevant to current structural steel (SteelWise, March 2007). But in one of their listed items, namely Direct-Tension-Indicator Washers, ASTM F959, they offered a note "e" to their table that stated: "Washers that express colored dyes when compressed are not covered by ASTM."


This note may be misleading because our Squirter DTI washers are produced to the requirements of ASTM F959 and installed according to the corresponding procedures in the RCSC specification. The orange silicone itself is not covered by ASTM, but a DTI having this feature can still be approved on jobsites and used exactly as a non-squirting DTI is used.


We believe the squirt feature, when calibrated on Skidmores on bolts at jobsites, as the manufacturer recommends, can enable the bolt installers and inspectors to be better and more efficient, and therefore improve the constructability of steel structures.


Chris Curven, Applied Bolting Technology Products

One Response to “On a Misleading Note?”

  1. Geoff

    Charlie Carter, P.E., S.E., chief structural Engineer with AISC, responds:


    Thank you for helping us to clarify our intent. We should have said that, when washers that express colored dyes when compressed are used, they are used following the same procedures as conventional DTIs.

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