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How tightly should screw bands be applied?

April 26, 2017applied bands screw tightly

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How tightly should screw bands be applied?

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Apply screw bands securely until fingertip tight. Center the prepared SNAP LID® on the jar. Then, using just your fingers, screw the band down evenly until you meet a point of resistance. Do not overtighten bands by using the full force of your hand or a utensil to tighten the band. After processing, bands may appear to have loosened. This is natural. Do not retighten bands after processing. Let jars stand undisturbed 24 hours. Overtightening bands prevents venting of excess air from the jar during heat processing. Jars that do not vent properly do not seal securely. Screw bands that are applied too tightly can cause lids to buckle. Buckling leads to seal failure.