huangyhg

uns thread information
hi,
trying to find some thread data (i.e. maj. dia, pitch dia. etc...etc..) for the following thread:
1.563 - 18 uns - 3a
the machinist's handbook outlines some unified thread types but does not seem to include this uns thread! unless i am looking in the wrong place! any help would be appreciated
thanks
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johni357,
my copy of machinery's handbook lists uns threads as "selected combinations" of diameter and pitch. uns threads are listed in table 14 labeled "standard series and selected combinations". the catch is that the 1.563-18 thread is listed as unef (extra fine) not uns. the good news is the table gives you all the data you need for the 1-9/16-18 thread.
timelord
you could search in google, or this forum:
timelordfff">, i think you meant table 4.
"art without engineering is dreaming; engineering without art is calculating."
mm,
my bad, table 4 is correct. in the section called screw thread systems.
timelord
in uns the s means special, so by definition it is not a standard size and is unlikely to be in a pre-calculated table. this means you should calculate it from scratch using the definitions in asme b1.1 or equivalent.
from what timelord says your example may not actually be a special but a standard unef.

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