Post on 02-Jun-2020
TC 9-524
APPENDIX A
TABLES
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FOR METRIC SIZES:The recommended tap drill size is equal to the out-side diameter minus the pitch. Metric tap sizes aredesignated by a capital M, the outside diameter inmillimeters, and by the pitch in millimeters; such asM22 x 1.5. To find the recommended tap drill size,subtract 1.5 from 22, to get 20.5, which is the recom-mended tap drill size. If a metric or inch is not avail-able for the recommended tap drill size, the roundup to the nearest available drill.
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I
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