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Selecting the correct thread size for a spindle based revolving truck

Revolving truck assemblies generally consist of a truck body rotating on some form of a bearing configuration and a spindle assembly which is usually threaded to fit the top of the flagpole shaft. While there is no formal industry standard for thread size, the most commonly used format is National Pipe Thread or NPT. The most common size is 1 1/4" NPT while 1" PT and 1 1/2" NPT can also be found. Threads that are cut in an NPT format are measured and expressed differently than National Coarse (NC) or National Fine (NF) threads. When determining the proper thread for a spindle assembly, the following approximate dimensions for measuring across the bottom of the spindle should help determine the NPT size to be ordered. As a reminder, pipe threads are tapered but this should be close enough for size determination. Unless otherwise stated, all Revolving Truck Assemblies offered in this catalog have 1 1/4" NPT spindles. Should you need a different size, contact Customer Service. In many cases, alternative spindles are available.
NPT - National Pipe Thread Size Approx. Measurement at the spindle base
1" NPT 1 1/2"
1 1/4" NPT 1 5/8"
1 1/2" NPT 1 7/8"
 

TRUCK ADAPTERS

for Open Top Shafts for use with Spindle Mounted Revolving Truck Assemblies - Cap Style, Tapped 1 I/4"NPT Sizes through 3 1/2" are secured via set screws. Larger sizes are secured by bolts. Contact Customer Service for custom or larger sizes.
 
  Matte BronzeTone
Shaft Diameter 1+ 6+ 12+ 1+ 6+ 12+
2" TRK2000 $40.00 $38.00 $36.50 TRK2003 $46.00 $43.50 $41.50
2 3/8" TRK2020 40.00 38.00 36.50 TRK2023 46.00 43.50 41.50
2 1/2" TRK2010 60.00 57.00 54.50 TRK2013 66.00 63.00 60.50
3 TRK2030 47.00 45.00 43.00 TRK2033 53.00 50.50 48.50
3 1/2" TRK2045 47.00 45.00 43.00 TRK2048 53.00 50.50 48.50
4 TRK2050 60.00 57.00 54.50 TRK2053 66.00 63.00 60.50
4 1/2" TRK2055 60.00 57.00 54.50 TRK2058 66.00 63.00 60.50
5 TRK2061 80.00 76.00 73.00 TRK2063 86.00 82.00 79.00
5 1/2" TRK2070 80.00 76.00 73.00 TRK2073 86.00 82.00 79.00
These and all other products offered by Heritage Flag & Supply should be recognized as component parts only and therefore the design and engineering of the application of these products is the responsibility of the customer. Warranty information is shown on the back cover of the price list.

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