The rounded-face sheet metal slant (denting the duct)

Carpentry framing hammers have a crowned, checkered face that will easily tear thin sheet metal. Always use a dedicated sheet metal duct hammer (tinner's hammer). A tinner's hammer features a perfectly flat, square face for striking seams flat, and a.

Tools, Fasteners & Hardware 1st Year GREEN

Stop if

Put that claw hammer back in your truck. Grab a proper flat-faced tinner's hammer so your strikes land flush without denting our panels or tearing the metal skin.

Watch out

Do not force the tool through the problem or substitute the wrong tool just to keep moving.

Check

Use the proper sheet metal layout or striking tool for the task.
Check whether the tool is denting, gouging, or weakening the metal.
Correct the technique on scrap before working the finished piece.
Keep layout marks visible without cutting a fracture path into the sheet.
Ask for a better tool if the one in your hand is damaging the work.

Steps

Use the proper sheet metal layout or striking tool for the task.
Check whether the tool is denting, gouging, or weakening the metal.
Correct the technique on scrap before working the finished piece.
Keep layout marks visible without cutting a fracture path into the sheet.
Ask for a better tool if the one in your hand is damaging the work.