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Machine Threads
For Shafts on Plain, Syphon and "RSP" Models,
Machine Threads (American Standard Screw Threads) are recommended for the
rotating shaft of all Rotary Union® joints for applications involving speeds of
600 rpm or more.
When Machine Threads are desired, they must be specified when
ordering the Rotary Union® joint. Be sure to specify either right-hand or
left-hand rotation of the drum or cylinder.
Machine Threads for standard-model Rotary Union® joints are
indicated in the specification data presented in this catalog. The condensed
reference table below consolidates Machine Threads information for various
Rotary Union® joint nominal sizes. Copper shaft gaskets are normally furnished
with machine thread joints.
How to Order Machine Threads
When Machine Threads are desired on the rotating shaft of a
Rotary Union® joint, be sure to include the following information with your
order:
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Rotating shaft shall be supplied with Machine
Threads (American Standard Screw Threads).
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Exact size of Machine Threads preferred, when
choice is given (examples: 7/8-14, 7/8-16, etc.).
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Left-hand or right-hand Machine Threads depending on
clockwise or counterclockwise rotation of machinery.
Note: For clarity, include both the machine
rotation as viewed from machine journal and the shaft thread direction.
Machining Detail
For Fabricating Syphon Pipe for "RSP" Models
Revolving syphon/supply pipe is not normally supplied with
Type "RSP" Rotary Union® joints. The internal, rotating pipe can be easily
fashioned from standard tubing or pipe, following the accompanying machining
tolerances for the given size of syphon. See individual Type "RSP" joint
specifications for recommended syphon size.
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Nominal
Shaft
Outlet
A |
Shaft
Diameter |
American Standard Screw
Thread |
Thread
Diameter |
Threads
Per Inch |
Thread
Length L |
| 1/4" |
3/4" |
5/8" |
18 |
7/16" |
| 3/8" |
3/4" |
5/8" |
18 |
7/16" |
| 1/2" |
1 1/8" |
3/4" or 7/8" |
16 or 14 |
5/8" |
| 3/4" |
1 1/4" |
1" |
14 |
3/4" |
| 1" |
1 1/2" |
1 1/4" |
12 |
7/8" |
| 1 1/4" |
1 7/8" |
1 5/8" |
8 or 12 |
7/8" |
| 1 1/2" |
2 1/4" |
2" |
8 or 12 |
1 1/8" |
| 2" |
2 7/8" |
2 1/2" |
8 or 12 |
1 5/16" |
| 2 1/2" |
3 1/2" |
3" |
8 or 12 |
1 9/16" |
| 3" |
4 1/8" |
3 1/2" |
8 or 12 |
1 3/4" |
Note: for additional
information, see selection data of specific Rotary Union joint required or
consult factory.
Nominal
Syphon
Size* |
Finished
Diameter
M |
Minimum
Length
N |
1/4"
tubing |
.252" |
1 5/8" |
| .249" |
| 1/4" |
.528" |
1 3/4" |
| .522" |
| 3/8" |
.663" |
2" |
| .657" |
| 1/2" |
.809" |
3" |
| .803" |
| 3/4" |
.997" |
3 1/4" |
| .991" |
| 1" |
1.247" |
3 3/4" |
| 1.241" |
| 1 1/4" |
1.621" |
4 1/4" |
| 1.615" |
| 1 1/2" |
1.871" |
4 1/4" |
| 1.865" |
| 2" |
2.308" |
4 1/4" |
| 2.302" |
| 2 1/2" |
2.807" |
4 1/4" |
| 2.801" |
| 3" |
3.432" |
5 1/8" |
| 3.426" |
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