Custom Search
Over 10000 Pages Indexed
Your Host
Click here to read about RF CafeKirt
Blattenberger

... single-
handedly
redefining
what an
engineering website
should be.

View the YouTube RF Cafe Intro Video Carpe Diem!
(Seize the Day!)

5CCG (5th MOB):
My USAF radar shop

Hobby & Fun

Airplanes and Rockets:
My personal hobby website

Equine Kingdom:
My daughter Sally's horse
riding business website -
lots of info

•−•  ••−•    −•−•  •−  ••−•  •
RF Cafe Morse Code >Hear It<

Job Board

About RF Cafe©

RF Cafe E-Mail

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

A Disruptive Web Presence

Custom Search
Over 10,000 pages indexed! (none duped or pirated)

Read About RF Cafe
Webmaster: Kirt Blattenberger
    KB3UON

RF Cafe Software

RF Cascade Workbook
RF Cascade Workbook is a very extensive system cascaded component Excel workbook that includes the standard Gain, NF, IP2, IP3, Psat calculations, input & output VSWR, noise BW, min/max tolerance, DC power cauculations, graphing of all RF parameters, and has a graphical block diagram tool. An extensive User's Guide is also included. - Only $35.
RF system analysis including
frequency conversion & filters

RF & EE Symbols Word
RF Stencils for Visio

Product & Service Directory
Personally Selected Manufacturers
RF Cafe T-Shirts & Mugs

RF Cafe Software

Calculator Workbook
RF Workbench
Smith Chart™ for Visio
Smith Chart™ for Excel