[Mike Reilley]

Here's drill and tap chart...but there are hundreds on the net. Find the one that fits your needs...or two...or three.

http://www.stanford.edu/group/prl/cgi-bin/wiki/index.php?title=Tapping_and_Threading#Tap_and_Drill_Bit_Size_Table
Bolt sizes (not screws...screws are tapered and are used in wood/plastic) were defined by the Unified Thread Standard....years ago...and have been replaced by metric sizes lately. In the Unified Thread Standard, there are numbered diameters for bolts, #0 through #10, with 0 the smallest and 10 the largest. The outside diameter of the threads = 0.060" + 0.013"*(numbered diameter). So #2 has a major diameter of 0.060" + 0.013"*2 = 0.086".

The number after the dash is threads per inch....so an 00-80 bolt is 0/.60" in diameter and has 80 threads per inch. A 4-40 bolt would be 0.112" in diameter... with 40 threads per inch.

Lastly....bolts from 1/4" and up..use the diameter outright, followed by the threads per inch.....1/4" 20 bolts are 0.25" in diamter and have 20 threads per inch.

 

[Mike Reilley]

Posted By rkapuaala on 11/05/2008 9:14 AM
Stan,
If it's writen in Java you should be able to port it over to a palm O.S. with a few tweaks. I would love to have that sw on my Palm Treo, sure beats using the calculator all the time. I was thinking of writing the sw myself and installing on my treo, but hey, why reinvent the wheel

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Porting the software to a handheld devices would be fantastic. Like others...I don't keep the computer handy in my shop...nor outside. But...if Handy Converter were to run on the mobile operating systems you find in cell phones....I'd download it in a heartbeat.