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SAE Tap & Drill Chart
The twist drill bit was
invented by Steven A. Morse of East Bridgewater, MA, in 1861. He received U.S. Patent 38,119 for his invention on
April 7, 1863. The original method of manufacture was to cut two grooves in opposite sides of a round bar, then to
twist the bar to produce the helical flutes. This gave the tool its name.Nowadays, the drill bit is usually made by rotating the bar while moving it past a grinding wheel to cut the flutes in the same manner as cutting helical gears. Tools recognizable as twist drill bits are currently produced in diameters covering a range from 0.05 mm (0.002") to 100 mm (4"). Lengths up to about 1000 mm (39") are available for use in powered hand tools.
The geometry and sharpening of the cutting edges is crucial to the performance of the bit. Users often throw away small bits that become blunt, and replace them with new bits, because they are inexpensive and sharpening them well is difficult. For larger bits, special grinding jigs are available. A special tool grinder is available for sharpening or reshaping cutting surfaces on twist drills to optimize the drill for a particular material. -Wikipedia
Standard SAE (Society of Automotive Engineers) tap & drill size chart.
| Thread Size |
Drill Diameter (in) |
Tap Drill Size |
Thread Size |
Drill Diameter (in) |
Tap Drill Size |
|
| Coarse Thread | Fine Thread | |||||
| 1-64 | .0595 | No. 53 | 0-80 | .0469 | 3/64 | |
| 2-56 | .0700 | No. 50 | 1-72 | .0595 | No. 53 | |
| 3-48 | .0785 | No. 47 | 2-64 | .0700 | No. 50 | |
| 4-40 | .0890 | No. 43 | 3-56 | .0820 | No. 45 | |
| 5-40 | .1015 | No. 38 | 4-48 | .0935 | No. 42 | |
| 6-32 | .1065 | No. 36 | 5-44 | .1040 | No. 37 | |
| 8-32 | .1360 | No. 29 | 6-40 | .1130 | No. 33 | |
| 10-24 | .1495 | No. 25 | 8-36 | .1360 | No. 29 | |
| 12-24 | .1770 | No. 16 | 10-32 | .1590 | No. 21 | |
| 1/4-20 | .2010 | No. 7 | 12-28 | .1820 | No. 14 | |
| 5/16-18 | .2570 | 'F' | 1/4-28 | .2130 | No. 3 | |
| 3/8-16 | .3125 | 5/16 | 5/16-24 | .2720 | 'I' | |
| 7/16-14 | .3680 | 'U' | 3/8-24 | .3320 | 'Q' | |
| 1/2-13 | .4219 | 27/64 | 7/16-20 | .3906 | 25/64 | |
| 9/16-12 | .4844 | 31/64 | 1/2-20 | .4531 | 29/64 | |
| 5/8-11 | .5312 | 17/32 | 9/16-18 | .5156 | 33/64 | |
| 3/4-10 | .6562 | 21/32 | 5/8-18 | .5781 | 37/64 | |
| 7/8-9 | .7656 | 49/64 | 3/4-16 | .6875 | 11/16 | |
| 1"-8 | .8750 | 7/8 | 7/8-14 | .8125 | 13/16 | |
| 1"-14 | .9375 | 59/64 | ||||
Copyright: 1996 - 2026 |
About RF Cafe RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while tying up your telephone line, and a lady's voice announced "You've Got Mail" when a new message arrived... |
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