ASTM F959 Squirter® DTI Washers
Compressible-Washer-Type Direct Tension Indicators
ASTM F959 covers the requirements for compressible washer type direct tension indicators in diameters ranging from 1/2” to 1-1/2” inclusive. DTIs are intended for installation under either a bolt head or a hardened washer. These washers are capable of indicating the achievement of a specified minimum bolt tension. They are available in two grades for use with F3125 structural bolts and are also available in a weathering steel option for both grades.
Precision Bolts offer these washers in Plain steel, mechanically galvanized
Applied bolting technology products has been manufacturing self-indicating DTIs for more than 20 years
and is the only company authorized to apply the registered trademarks squirter® and durasquirt® to its
DTIs. And weathering steel (type 3) finishes.