Rotary Unions SPS Series

SPS Series 1-Passage Rotary Unions & Joints

SPS Series 1-Passage Rotary Unions & Joints
Maximum Pressure See Other Pressure Options
Maximum Speed See Other Speed Options
Connection Type See Other Connection Options
Suitable Media See Other Media Options

The SPS Series single passage rotary unions are compact, lightweight and corrosion-resistant featuring a stainless steel shaft and hardcoat anodized aluminum housing. All models come standard with a male NPT threaded shaft connection, a female NPT threaded housing connection and two tapped holes on the end of housing for easy equipment integration.

The shaft, housing, seal material, and design makes this an excellent solution when transferring air/gas (under pressure or vacuum) from a stationary source to a rotating component.

Need to combine air/gas with electrical power, signal and/or data transfer? No problem. The SPS Series rotary unions are designed to integrate directly with our standard thru-bore electrical slip rings. See options.


Part # Connection Passage Size Diameter Length Through Bore Min. Torque* Part Downloads Information
SPS-5210 [SPSM-5210]1/4"-18 NPT []0.250" [6.35 mm]1.500" [38.1 mm]2.380" [60.452 mm]None1 in-lbs [0.11 Nm] Buy Now
SPS-5410 [SPSM-5410]1/2"-14 NPT []0.500" [12.7 mm]1.750" [44.45 mm]2.630" [66.802 mm]None2 in-lbs [0.23 Nm] Buy Now
SPS-5610 [SPSM-5610]1"-11.5 NPT []1.000" [25.4 mm]2.750" [69.85 mm]3.130" [79.502 mm]None3 in-lbs [0.34 Nm] Buy Now
SPS-5910 [SPSM-5910]2"-11.5 NPT []2.000" [50.8 mm]3.940" [100.076 mm]3.690" [93.726 mm]None4 in-lbs [0.45 Nm] Buy Now

*Minimum torque required to rotate based on zero pressure with Oil/Hydraulic media (or Air/Gas media for SPS Series). 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.

Technical Specifications

Maximum Pressure 600 PSI [40 BAR]
Maximum Speed 500 RPM
Maximum Vacuum 30 HG
Temperature Range 0° F to 220° F [-18° C to 105° C]
Suitable Media Air/Gas
Connection Type NPT
SPS Series Rotary Unions - Housing Material
Housing: Material (Plating/Coating) Aluminum (Black Hardcoat Anodize)
SPS Series Rotary Unions - Shaft Material
Shaft: Material (Plating/Coating) Stainless Steel

All values listed under Technical Specifications 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. The use of Water media with temperatures above 212° F (100° C) require alternative seal materials. Please consult with DSTI regarding your specific application requirements.

Available Options

Available Custom Modifications for SPS Series Rotary Unions

Custom Modifications

Easier and less expensive than you may think. We can modify our standard products to fit your project requirements.

Learn More
Electrical Slip Rings for SPS Series Rotary Unions

Electrical Slip Ring Integration

Get the complete package. With the purchase of a shaft extension, the SPS Series will integrate with our electrical slip rings for power, signal and data transfer.

View Options


Our experts are here for you!

Contact Us