Dixon Sanitary 2010 Catalog

Technical Information
Size
Pipe OD
Tapered Threads
Thread Dimensions
Straight Threads
NPT BSPTr Acme 3A
TPI TPI TPI ODM (max) IDF (min)
1/8" .405 27 28
1/4" .504 18 19
3/8" .675 18 19
1/2" .840 14 14
3/4" 1.050 14 14
1" 1.315 11.5 11 8 1.462 1.352
1-1/4" 1.660 11.5 11
1-1/2" 1.900 11.5 11 8 1.994 1.884
2" 2.375 11.5 11 8 2.526 2.416
2-1/2" 2.875 8 11 8 3.058 2.948
3" 3.500 8 11 8 3.590 3.480
4" 4.500 8 11 6 4.695 4.544
5" 5.563 8 11
6" 6.625 8 11
8" 8.625 8
10" 10.750 8
12" 12.750 8
ODM -- Outside Diameter of
the Male
IDF -- Inside Diameter of the
Female
TPI -- Threads Per Inch
GHT (3/4") -- 1.0625 ODM,
11-1/2 TPI
NPT = National Pipe Taper
BS = British Standard
Normal Engagement Length of NPT Thread in Inches (A) *
* Dimensions given do not allow for
variations in tapping or threading.
Sanitary Size ID of Fitting
1/8" 1/4"
1/4" 3/8"
3/8" 3/8"
1/2" 1/2"
3/4" 9/16"
1" 11/16"
1-1/4" 11/16"
1-1/2" 11/16"
2" 3/4"
Sanitary Size ID of Fitting
2-1/2" 15/16"
3" 1"
4" 1-1/8"
5" 1-1/4"
6" 1-5/16"
8" 1-7/16"
10" 1-5/8"
12" 1-3/4"
Identifying Threads
DIN knuckle threads for sanitary applications have a unique
round shape making them easy to identify. There is a 30°
included angle between the threads. There are 6 to 8 threads
per inch for sanitary fittings. Measuring the ID of the round
nut or the OD of the threads on the weld liner will help with
identification. As Dixon Sanitary will be offering inch sizes, the
best size identification is the OD of the tube.
The threads for RJT fittings are British Standard Whitworth.
These look similar to straight threads but have a 55° angle and
small radii on the tips rather than the flat tips and 60° angle
found on U.S. standard straight threads. There are 6 to 8
threads per inch for the sanitary fittings.
Dixon Sanitary 2010 800.789.1718
169
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Technical