Squirter® DTI FAQs
Are the squirt grooves stamped or cut into the DTI steel?
The small squirt grooves are stamped into the steel of the DTI in the same manner as the larger bumps. They allow the silicone to emit when proper bolt tension has been achieved. These grooves are permissible by standard, as specifically mentioned in ASME B18.2.6-2010 Fasteners for Use in Structural Applications. This is the standard adopted by ASTM F959. Section 5.1 of this standard is given below.
Section 5.1 Direct Tension Indicator Dimensions: All washer-type direct tension indicators, Type 325 and 490, shall conform to the dimensions give in Table 6. Additional characteristics to accommodate the necessary features for silicone emitting type indicator washers are permissible.
All our DTIs are manufactured, tested and certified in our ISO/IEC 17205 accredited laboratory to meet or exceed ASTM standards. If you have been told that these grooves cause problems, rest assured that there is no credible evidence whatsoever to support this claim, and that the grooves are allowed by specification.
