Troubleshooting Guide | Rough Threads


Incorrect flute hook for material being tapped

Solution: Obtain material specifications and consult Spiralock sales for correct style of tap.


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Incorrect lead chamfer

Solution: Change to tap with increased chamfer. This may require more depth in minor diameter for blind holes


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Improper thread relief

Solution: Obtain material specifications and consult Spiralock sales for correct style of tap.


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Wrong or insufficient lubricant

Solution: Consult Lube specialist for proper cutting oils


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Loading on tap teeth (metal welds to tap)

Solution: Increase amount of coolant, direct coolant to end of tap


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Tap drill too small

Solution: Select proper size from Spiralock Drill Chart


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Chips packed in tap flutes

Solution: Increase amount of coolant, direct coolant to end of tap


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Tap worn on cutting edge

Solution: Regrind or replace tap


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Tap not going deep enough

Solution: increase tap depth and minor diameter depth


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Tap hitting bottom of hole

Solution: increase minor diameter depth

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