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Special Acme Taps<br />
Information Form for Special Orders<br />
Acme threads are used for producing traversing motions on machine tools as well as in the manufacture<br />
of valves, jacks and other mechanisms. Due to the thread form, acme thread engagements are usually<br />
longer than standard 60º thread lengths, therefore they require a much longer chamfer length on the<br />
tap or sets of taps. The length of the part to be threaded, the diameter, the T.P.I. and material are<br />
prime determining factors in arriving at the proper chamfer length and whether it will take one tap or<br />
several to do the job. In many cases a single tap, properly designed will suffice.<br />
In an effort to provide the correct tap for your application, please forward the information requested<br />
below, or when replacement taps are required, it is necessary to supply the used tap(s) or blueprint to<br />
ensure the new tap(s) are manufactured exactly the same.<br />
Size______________________<br />
Threads per Inch____________________________<br />
Right or Left Hand __________<br />
Single or Multiple Lead: ______________________<br />
Pitch Diameter & Class of Fit (if not to standard 2G) _______________________________________<br />
o<br />
Thread Form:<br />
o 29º Acme<br />
o 30º Trapezoidal (Metric)<br />
o 10º Modified Square<br />
o Stub Acme<br />
Other - Full details of any other modifications must be supplied for thread forms other than the<br />
standard thread forms listed above<br />
Material to be threaded: (please indicate the hardness & machinability) _______________________<br />
Thru or Blind Hole: (if blind indicated clearance beyond thread depth) ________________________<br />
Depth of hole to be threaded: (indicate any reach prior to tap engagement) ___________________<br />
Approximate number of parts to be threaded: ___________________________________________<br />
Are the taps to be used for existing or roughed threads? ___________________________________<br />
Will fixture used affect the length of the tap(s)? __________________________________________<br />
Other pertinent information which will aid us in determining the type of tap(s) required for your<br />
application: ________________________________________________________________________<br />
___________________________________________________________________________________<br />
___________________________________________________________________________________<br />
___________________________________________________________________________________<br />
V 1.0 – November 2011 Page 32
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