LT-2181-OF, 8-Passage Rotary Union, 1/8"-27 NPT Housing Connections, O-ring Shaft Seal Gland, Aluminum

Product Code:
  • LT-2181-OF-R.A
Lightweight, compact, 8-flow passage, through-bore rotary union with 1/8"-27 NPT housing connections, shaft O-ring face seal glands for flush mounting the union to an interface and aluminum construction

Availability: 7

Additional Information

Additional Information

Downloads LT Series Catalog PDF Drawing DWG [2D] STEP [3D]
Number of Passages 8
Connection Type 1/8"-27 NPT
Max. Pressure 600 PSI [40 BAR]
Max. Speed 500 RPM
Media Type Air/Gas
Performance Charts Pressure vs. Speed Data
Material Type Aluminum
Diameter 2.187" [55.55 mm]
Length 4.746" [120.549 mm]
Through Bore 0.375" [9.525 mm]
Min. Torque 5 in-lbs [0.56 Nm]
Product Disclaimer The use of liquid media is not recommended for this product. Please select from one of our other product lines or consult DSTI if your application requires use of liquid media.

Values listed are dependent on a combination of all application parameters. Please note operational life is dependent upon both rotational speed and duty cycle. Contact DSTI if your application requires operating close to the maximum rotational speed with a continuous duty cycle.

Applications with temperatures above 220° F (105° C) require alternative seal materials. Please consult with DSTI regarding your specific application requirements.

Value listed for the minimum torque required to rotate is based on zero pressure with oil/hydraulic media. Required torque to rotate may be greater when using other media types or dry running. For specific torque requirements, please contact DSTI to discuss your application.


The 8-passage, LT Series rotary unions feature NPT housing connections and a shaft O-ring face seal glands for flush mounting the union to an interface (the threaded shaft connections are plugged). The compact and lightweight, all-aluminum construction is ideal for a number of automation and robotic applications requiring air/gas service.

For more information, see LT Series 8-Passage Rotary Unions.