Air rotary union LT Series

for gasfor vacuum4-passage

Description
The 4-passage LT Series rotary unions are designed for air, gas and vacuum applications in automation and robotic systems. These compact, lightweight units feature an all-aluminum construction and four independent flow passages to transfer different media simultaneously. LT models include standard side-threaded connections on the shaft and housing; optional shaft O-ring face-seal glands are available for flush mounting and must be specified at order. The LT Series is designed to integrate with standard electrical slip rings to combine fluid transfer with electrical power, signal and data.

Product Highlights

• All-aluminum construction (housing and shaft)
• Four independent flow passages for simultaneous media transfer
• Compact, lightweight design for automation and robotic applications
• Standard: side-threaded connections on shaft and housing
• Optional: O-ring face-seal glands for flush (non-threaded) mounting
• Compatible with standard electrical slip rings for combined fluid/electrical solutions
• Intended primarily for air/gas and vacuum (liquid media not recommended)

Performance

• Maximum Pressure (LT Series): 600 PSI [40 BAR]
• Maximum Speed (LT Series): up to 500 RPM (dependent on configuration)
• Maximum Vacuum: 30 HG
• Temperature Range: 0° F to 220° F [-18° C to 105° C]
• Connection Types (standard): NPT and BSPT side-threaded connections; optional O-ring face-seal glands for flush mounting
• Passages: Four independent flow passages

Configurations (selected)

• LT-2141 (LTM-2141): 1/8"-27 NPT (Rc1/8"-28 BSPT) — Passage size 0.156" [3.962 mm], Diameter 2.187" [55.55 mm], Length 3.314" [84.176 mm], Through bore 0.375" [9.525 mm], Min. torque 4 in-lbs [0.45 Nm]
• LT-2341 (LTM-2341): 3/8"-18 NPT (Rc3/8"-19 BSPT) — Passage size 0.375" [9.525 mm], Diameter 3.437" [87.3 mm], Length 6.284" [159.614 mm], Through bore 0.375" [9.525 mm], Min. torque 12 in-lbs [1.36 Nm]

Notes and Warnings
Pressure vs. torque and pressure vs. speed data are provided for performance characterization (charts available on product page). Liquid media are not recommended for these models. All technical values depend on application parameters; operational life depends on rotational speed and duty cycle. Applications with temperatures above 220° F (105° C) require alternative seal materials. Use of water at temperatures above 212° F (100° C) requires alternative seal materials.

Technical specifications

• Series / Model: LT Series
• 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]
• Connection Types: NPT and BSPT (standard side-threaded connections); optional O-ring face-seal glands for flush mounting
• Housing Material: Aluminum (blue anodization)
• Shaft Material: Aluminum (electroless nickel finish)
• Passages: Four independent flow passages
• Optional Interface Mounting: Shaft flange mount and housing flange mount
• Shaft Connection Options: side-threaded; optional non-threaded O-ring face-seal glands; threaded interface mounting holes; machining holes (plugged)
• Suitable Media: Air/Gas and vacuum (liquid media not recommended)
• Minimum torque examples: LT-2141 = 4 in-lbs [0.45 Nm]; LT-2341 = 12 in-lbs [1.36 Nm] (zero pressure example)