Modern Steel Construction » Steel in the News » AASHTO Approved Squirters

Steel in the News

Back to all posts

AASHTO Approved Squirters
Posted by Tasha Weiss on August 22, 2011 at 2:09 PM.

AASHTO recently passed a ballot that says Self-Indicating Direct Tension Indicators (Squirter DTIs) are an approved option for indicating when at least the minimum required clamp load has been achieved in structural bolts on steel bridges.


Self-Indicating DTIs will be included in the next revision of AASHTO’s LRFD Bridge Construction Specification making it easier for DOTs, engineers and construction personnel to specify, install and inspect Squirters. It will be available in AASHTO’s bookstore at


Squirter DTIs have been used on steel bridge projects such as Louisiana’s John James Audubon Bridge, North America’s longest cable-stayed bridge.


Applied Bolting has issued a field study by Florida DOT comparing costs of Turn-of-Nut to Squirter DTIs. Read the report on Applied Bolting’s website, here.

Bookmark and Share