tap drill sizes (for appx. 75% thread) INCH and METRIC
VICTOR MACHINERY EXCHANGE, INC.
56 Bogart Street, Brooklyn, NY 11206-3817
Call Toll Free: 1-800-723-5359
Shop online at www.victornet.com
To determine the proper drill size for 75% thread on a special pitch tap use the following formula:
Drill Size = Major Diameter - (.975 divided by the number of threads per inch).
For example, with a 1/4-32 tap, .250" - .0305 = .2195 (7/32" or #2 drill size).
Metric tap drill sizes are the diameter minus the pitch (For example, 42mm x 1.5 tap uses a 40.5 drill).
Follow these links to browse our taps and die selection:
For common National Coarse and National Fine sizes we offer
spiral point taps,
spiral flute taps,and
oversize taps, as well as
round adjustable dies, and
hex rethreading dies.
For making metric right hand threads we supply metric taps and
You can buy individual sizes or tap and die sets.
To make left hand threads, choose
inch size left hand taps and dies or
metric left hand taps and dies.
To make pipe threads use pipe taps and dies.
We carry an extensive stock of
special thread taps and
special thread dies.
To cut square threads we offer
In addition to the many sizes we list, custom taps to your specifications can often be shipped in as little as 24 hours.
Follow this link to order metric drill bits or
inch size jobber length drill bits.