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parameters2:STUB ACME THREAD PLUG
parameters3:MOD ACME THREAD PLUG
ACME
Screw Threads
American National Standard Stub Acme
Threads can be found is ASME/ANSI
B1.8 and are for those atypical applications where, due to
mechanical or metallurgical considerations, a coarse-pitch thread of shallow
depth (thin wall) is necessary. The fit of Stub Acme threads corresponds to the
Class 2G General
Purpose Acme Thread found in ASME/ANSI
B1.5. For a fit having minimal backlash, the tolerances and
allowances for classes 3G or 4G General Purpose Acme Threads may be used.
The Major and Minor Diameter allowances for
Stub Acme threads are the same as those given for General Purpose Acme threads.
Pitch Diameter allowances for Stub Acme threads are the same as for Class 2G General
Purpose Acme Threads. Pitch Diameter Tolerances for Stub Acme threads are the
same as for class 2G General Purpose Acme Threads. Stub Acme Threads have a
preferred series of diameters and pitches which happens to be the same as
General Purpose Acme Threads.
The proper method of designation for
Standard Stub Acme threads is illustrated in the following examples:
0.500"-20 Stub Acme-2G indicates that the thread has a ½" major
diameter, 20 threads per inch, class 2G, right hand, single thread, Standard
Stub Acme thread. This Designation stays the same with Left Handed Threads
except you add LH behind the description, for example: 0.500"-20 Stub
Acme-2G LH.
Recognizing that the Standard Stub Acme
does not always provide an accepted thread for all applications basic data for
two other frequently used forms have been tabulated. These are designated
MODIFIED Forms 1 and 2. You are strongly urged to ALWAYS use the Standard Stub
Acme form in preference to the Modified form where it is realistic. For
Modified Form 1, (M1) - the pitch and minor diameters will be smaller than
similar values for the standard form. For Modified 2, (M2) - the pitch and
minor diameters will be larger than values for the standard form. Thread
designation is the same as the Standard Stub Acme except that you add the M1 or
M2 after the Class or hand in case of a LH thread (i.e. 0.500"-20 Stub
Acme-2G M1 or 0.500"-20 Stub Acme-2G LH M1)
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For more information click the links below:(links not active yet)
" Stub Acme Thread Profile
" Stub Acme Thread Data
" Stub Acme Modified (M1,M2) Thread Profile
" Stub Acme Modified (M1,M2) Thread Data
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