I'm speaking in vague terms for the beginner to understand.ĭo you guys know what brass drills are like?I don't mean to be picky, George, but a 1/4-20 tap requires a #7 drill bit and a 5/16-18 tap requires a letter size F drill. If you use a drill that is just a wee bit too small,you are liable to break the tap. Taps are only supposed to produce a 75% thread,anyway. A 1/4-20 thread uses an "F" size drill,but you aren't going to die if you use a close fractional drill substitute. I use them seldom,so can't recall the exact beginning and ending sizes. The letter drills are drills in larger sizes from ABOUT 1/4" to ABOUT 1/2" range. Number drills give you a much better selection in the smaller sizes,and go down to # 80, ABOUT. Some notes: The drill size chart below provides a list of standard size drill bits in several measurement systems. Then I got a set of letter drills,and finally some metric drills. For much of my career,I got along fine with just fractional drills and number drills. Each type gives you sizes in between what fractional drills offer. There are fractional drills,numbered drills,letter drills,and metric drills. TAP DRILL CHART PHONE: 1-80 FAX: 1-80 WEB: Imperial has made a concerted effort to provide accurate information in its catalog and on its website, however Imperial assumes no responsibility for the accuracy of the information.
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