DIMENSIONS FOR TWIST DRILLS

FOR BORING HOLES TO BE THREADED WITH U. S. FORM OF THREAD

This gives the depth to allow for a full thread in a nut or similar piece of work for threads for 2 to 90 per inch, regardless of the diameter. A special nut for a 2-inch bolt, 20 threads per inch, U. S. Standard would have a hole 2. 1.93505 inches in diam

eter bored in it.

.06495

SIZES OF TAP DRILLS FOR TAPS WITH "V" THREAD

more convenient in some cases.

This table gives similar information but in a way that would be

3

•430 14

3

.456 14 32

HHH 1 2 2 2 2 2 2 2 2 2 2 2 2 2 2 3 33333

34

.234 .246 116.261 .272 1 .298

NO NO NO

These are for the American Screw Company's Standard screws that have been in use for many years.

This table covers the sizes adopted by the American Society of Mechanical Engineers in June, 1907, and now known as the A.S.M.E. Standard for machine screw sizes.