FAQs
Orientation – Is the DTI facing the right way?
For nut-side installations, make sure your stack-up looks like this:
• Bolt through hole
• Squirter® DTI (bumps facing away from the steel)
• Hardened flat washer
• Nut
Why it matters:
If the bumps face the steel, they’ll dig into it instead of compressing. That stops the DTI from doing its job, and you won’t get a proper indication.
Hole Size – Are you using standard holes?
Squirter® DTIs are designed for standard holes. If you’re dealing with oversized or short-slotted holes, you need to support the DTI properly:
• Bolt through hole
• Hardened flat washer (to span the oversize or slot)
• Squirter® DTI (bumps out)
• Hardened flat washer
• Nut
Why it matters:
Without support, the DTI bumps can fall into the hole and won’t compress like they should.
Wrench Power – Is your tool up to the job?
A weak wrench won’t crush the DTI bumps. Here’s what’s required.
• Impact Wrench with ½” to 1-¼” bolts: DTI should fire within 10 seconds
• Impact Wrench with 1-3/8″ to 1-½” bolts: DTI should fire within 15 seconds
• Continuous-turn wrenches: No time limit, but the wrench must tension the bolt fully without stalling
Hardware Condition – Is it clean or corroded?
Rust or corrosion increases friction, making tensioning harder. More friction = more torque = higher risk of stalling or breaking bolts.
Best practice:
Use clean, “as-delivered” hardware. If that’s not possible, requalify using Stickwax or Molylube on the bolt threads and nut washer face.
Painted Steel – Is the coating too thick or uncured?
If the steel is heavily painted or the coating has not cured, the DTI channels can clog.
Fix it:
Add an extra hardened flat washer under the DTI to separate it from the paint and restore a clear indication.
Tightening Method
Tension Calibrator
Quick Start Guide
Direct Tension
Indicator Guide
Pro Tips
Line Card
Our Video Library
Want to know more about the ways our ASTM F959 certified DTIs improve the structural steel bolting process? Watch our video resources below and contact us if you have any further questions.
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