A cap's inside diameter typically needs to be undersized by around .030" in order to effectively mask a stud, tube, or bolt. We used this logic for the Stud Size to Mask (in) dropdown above.
Example: If the tube's outside diameter (OD) you're masking is 0.2", then the cap that will work best would be 49-0000172-01000 because its Inside Diameter is 0.172"
Technical Data Sheet
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