Static field route #19074

What do I do when a TDC corner nut strips out while tightening?

Rectangular Duct Assembly: TDC / Ductmate / Flanges✅ STANDARD FIELD CORRECTIONV190 answer-gap expansion

📖 Verified core answer

A stripped corner cannot clamp the gasket. Replace or through-bolt/back up the failed hardware per shop standard before pressure or startup.

Open in Field Rescue Open category

Field verification checklist

Confirm which corner stripped and whether the flange is bent or misaligned.
Check gasket placement at the corner and whether the joint is pulling evenly.
Remove bad hardware and inspect the corner piece.
Use shop-approved replacement hardware/backing method.
Recheck clips, corners, and sealant after tightening.

Ask foreman

The corner bolt/nut stripped on this TDC/Ductmate joint at [location]. I checked gasket and flange alignment. Do you want replacement corner hardware or an approved backed-up through-bolt repair?

Text to foreman

Route options

AMake the field correction only if it is within your assignment and the approved method.

BHold and document the condition if the fix affects airflow, access, life safety, pressure class, rated assemblies, equipment, or another trade.

CBring the foreman/detailer the location, what you checked, and what decision you need before cover, startup, or rework.

Do not do this

Do not leave a stripped TDC/Ductmate corner bolt in place and hide the gap with sealant.

Why this matters

A loose corner can become a high-velocity leak, noise point, or pressure-test failure.

Verification basis

Approved drawings/specs, project coordination drawings, manufacturer instructions/submittals, shop standards, foreman/detailer direction, employer policy, and AHJ/code requirements.