Duff-Norton Rotary Unions

The Duff-Norton Rotary Union 300 Series is designed for high-speed air and water applications in tight spaces. Operating at up to 3,500 RPM, 117 psi, and 250°F, it features nickel-plated steel construction for corrosion resistance. Its small profile and support for NPT, BSP, BSPP, and machine threads make it ideal for compact, general-purpose setups.

The Duff-Norton Rotary Union 500 Series is designed for use around the shaft with high flexibility. Supporting water, air, and hydraulic fluid, it handles up to 5,800 psi and 248°F. Available in high-speed or high-pressure models, it mounts directly on the shaft and suits various NPT thread sizes. Nickel-treated carbon steel ensures strength and durability in demanding setups.

The Duff-Norton 600 Series is built for reliable performance with air, water, or hydraulic fluid, handling pressures up to 3,625 psi and speeds up to 1,500 RPM. It offers mono flow operation with axial or 90° radial flow options, and supports thread sizes from 1/4″ to 1″ NPT, MT, BSP, and BSPP. A GR seal allows bi-directional rotation, while nickel-treated or stainless steel construction ensures lasting durability.

The Duff-Norton 805 Series is a high-speed rotary union for air, water, oil, and non-toxic gasses, operating at up to 5,000 RPM and 350°F. It supports mono and dual flow setups with thread sizes from 1/4″ to 1″, and offers two seal options for pressures up to 725 psi. With an aluminum housing and stainless steel shaft — or full stainless build — it delivers flexible, durable performance across a wide range of demanding applications.

The Duff-Norton 1100 Series is built for low-speed or swiveling operations with air, water, or hydraulic fluid. It supports pressures up to 725 psi and temperatures to 392°F, with NPT and BSP threads from 1/4″ to 3″. GR sealing ensures dependable performance, while axial or 90° radial flow options add flexibility. Available in nickel-plated or full stainless steel for excellent corrosion resistance.

The Duff-Norton 1102 Series is engineered for slow rotation and swivel use with air, water, or hydraulic fluid. It supports pressures up to 1,160 psi and offers axial or 90° radial flow options. With thread sizes from 1/4″ to 6″ NPT and BSP, the design includes dual ball races for added stability and a GR seal for superior performance. Available in nickel-plated or stainless steel for excellent corrosion resistance in tough environments.

The Duff-Norton 1200 Series is a compact swivel union designed for water, air, or hydraulic fluid, handling pressures up to 5,075 psi and temperatures to 392°F. Ideal for tight spaces, it features PTFE seals that require no lubrication and supports NPT threads from 1/4″ to 2″—with other types available. Nickel-plated steel construction ensures corrosion resistance and easy installation.

The Duff-Norton 1400 Series is engineered for low-speed swivel applications involving air, water, steam, or oil. It operates at pressures up to 5,075 psi and temperatures to 392°F, with thread sizes from 1/4″ to 2″ NPT and BSP options. Its radial 90° flow design suits compact spaces, and stainless or carbon steel construction ensures durability under extreme conditions.

The Duff-Norton 1600 Series features a two-port design ideal for air, water, or hydraulic fluid at up to 2,900 psi and 1,500 RPM. Each circuit is individually sealed to prevent cross-contamination, allowing the use of dissimilar fluids. Built from nickel-plated steel – or optional stainless with ceramic shaft – it offers durability and extended service life in demanding environments.

Compared to the 1600 Series, the Duff-Norton 1650 Series offers the same dual-port performance in a more compact design for tighter installations. It handles water, air, or hydraulic fluid at up to 2,900 psi and 1,500 RPM. Individually sealed circuits prevent cross-contamination, and the unit is available in nickel-plated steel or stainless with a hardened ceramic shaft for increased speed capability and longer life.

The Duff-Norton 1700 Series is designed for high-pressure hydraulic and pneumatic applications, operating at up to 5,075 psi and 80 RPM. It features NPT or BSP threads from 1/4″ to 3″ and includes a GR seal suitable for most fluids. A single-acting thrust bearing supports slow rotation under pressure, while nickel-plated steel ensures corrosion resistance and durability.

The Duff-Norton 1900 Series is built for very high-pressure hydraulic and pneumatic systems, rated up to 10,150 psi and 100 RPM. With NPT threads from 1/4″ to 3″, it features a GR seal, double-acting thrust bearing, and bronze bushing for enhanced stability and shaft guidance. Nickel-plated steel construction ensures long-term corrosion resistance.

The Duff-Norton 5000 Series handles water, steam, hot oil, and air with pressures up to 750 psi and temperatures up to 395°F. Its 300-grade stainless steel build ensures corrosion resistance, while precision bearings and a balanced mechanical seal extend service life. Available in mono or dual flow, the series supports multiple seal options for standard and abrasive applications.

The Duff-Norton 8000 Series is designed for steam and hot oil service, handling up to 600°F and 175 psi. Available in 2″–4″ NPT, BSP, or ISO threads, it features a cast iron housing with a stainless insert and a nickel-plated steel shaft. A carbon graphite bearing eliminates the need for lubrication, while mono and dual flow options support flexible installation in demanding high-temperature systems.

The Duff-Norton 9000 Series handles steam, hot oil, and water up to 600°F and 250 psi. Its advanced bellows sealing system resists debris and maintains sealing over time. Available in NPT, BSP, or flanged connections up to 3″, it includes dual bearings on larger sizes for alignment and durability. Ideal for high-temp, contaminated media in both mono and dual flow setups.

The Duff-Norton 9000-G Series builds on the 9000 Series with carbon graphite bearings for high-temperature use up to 600°F. Designed for steam, water, and hot oil, it features a bellows seal that resists clogging from dirty media. Operating at 700 RPM and up to 250 psi, the 9000-G requires no lubrication and is ideal for general-purpose, high-temp applications. Flanged mounting available.

The Duff-Norton DWPA Series is designed for general-purpose rotary applications using water or non-corrosive oils, operating at up to 14 bar and 1,750 RPM. With aluminum housing and stainless steel rotor, it features silicon carbide/carbon graphite seals and high-precision bearings for smooth performance. Dual flow versions are available with optional elbows, and the compact design is ideal for printing and similar industries.

The Duff-Norton DNHC & DNHCR Series is designed for use on manual or electric reels in sanitation vehicles. Operating at up to 350 bar and 150°C, it handles water at low speeds (up to 30 RPM) with excellent corrosion resistance. Its compact design, single-acting thrust bearing, and maintenance-free construction make it ideal for high-pressure hose reel systems exposed to harsh conditions.

The Duff-Norton DNRF Series is built for positioning flange-connected pipes in loading arm systems. Designed for low-speed or swiveling movement, it handles all fluids (except steam and thermal oils) at up to 16 bar and 140°C. Available in nickel-plated carbon steel or 316L stainless steel, the DNRF offers durable performance in any weather. Maintenance kits and custom flange options are available.

The Duff-Norton HPMC Series is designed for high-pressure multi-circuit use, supporting up to 5,880 psi and 248°F at speeds up to 180 RPM. With 2 to 8 individually sealed ports, it allows dissimilar fluids without cross-contamination. Made of nickel-plated steel, HPMC unions are ideal for hydraulic and fluid transfer systems where reliability and performance are critical.