695846ea4d For example, with a 1/4-32 tap, .250" - .0305 = .2195 (7/32" or #2 drill size). Croix , St. Newman Tool's handy hint. 151 New Park Avenue Hartford, CT 06106, USA Phone: 1-800-465-1384 Fax: 1-800-605-2442 Email:infonewmantools.com Go to . Back to Top of Page . Victor Machinery Exchange, Inc. link to Tap Drill size calculator (for inch size taps) Acme BSP & BSPT Pg . This works for all 75% threads, not just metric.
3/8 - 1/16 = 5/16. link to Inch tables link to Metric tables . Metric tap drill sizes are the diameter minus the pitch (For example, 42mm x 1.5 tap uses a 40.5 drill). Home Shop Alphabetical Index Sales & Bargains Bandsaw Blades Books Product Pages My Tool Crib Express Order Model # Qty Info About Victor Machinery Ordering Info Visit Us Privacy Policy Site Map Metalworking Reference Links Contact Free Catalog E-Mail Specials E-mail Us Account Login View Cart Checkout . .. To make left hand threads, choose inch size left hand taps and dies or metric left hand taps and dies. For other sizes that don't work out so nicely, just use the closest drill size. Thomas , St..
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