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"1600 Series" Rotary Union

Model:  1600 Series / SRU-4094

Part N° Description Nominal Pipe Size Shaft Thread (A) Inlet Thread C Overall Length (F) Flats on (J) Diameter Guide Price Quantity
L16191/4KNPT 2 x 1/4 1/2 1/4 4.05 .94 Quote Required
L16833/8KNPT 2 x 3/8 3/4 3/8 5.62 1.49 Quote Required
L16441/2KNPT 2 x 1/2 1 1/2 7.87 1.77 Quote Required
L16443/4KNPT 2 x 3/4 1 3/4 7.12 1.77 Quote Required
L17601KNPT 2 x 1 1-1/2 1 9.72 1.96 Quote Required
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Rotary union with a two port design made for use in a wide variety of applications.

1600 Series Rotary Union

1600 Series Rotary Union

Features and Benefits

  • Two Port Design - Features two ports for use in a wide variety of applications
  • Corrosion Resistant - Nickel plated steel for corrosion resistance. Also available in all stainless steel and with a hardened ceramic shaft for higher speeds and longer life
  • Medium Speed & Medium Pressure Capable - Offers the ability to use medium speed and pressure simultaneously
  • No Cross Contamination - The 1600 Series Rotary Union can be used with two dissimilar fluids. All circuits are individually sealed eliminating cross contamination

1600 Series Two Port Rotary Union Dimensional Diagram

1600 Series Two Port Rotary Union Diagram
Nominal Pipe Size Shaft Thread (A) B Inlet Thread C D E F G H I J Flats on (J) Diameter K
2 x 1/4 1/2 .50 1/4 1.96 466790C 4.05 .94 1.88 1.06 1.18 .94 .47
2 x 3/8 3/4 .59 3/8 2.36 466794C 5.62 1.22 2.83 1.49 1.65 1.49 .47
2 x 1/2 1 .78 1/2 3.14 466796C 7.87 1.57 3.81 2.12 1.96 1.77 .59
2 x 3/4 1 .78 3/4 3.14 466796C 7.12 1.57 3.81 2.12 1.96 1.77 .59
2 x 1 1-1/2 .78 1 3.54 466799C 9.72 2.04 5 3.54 2.36 1.96 .70

1600 Series Two Port Rotary Union Specifications

Nominal Pipe Size Nickel Plated Steel Hardened Shaft
Left Hand Thread Right Hand Thread Left Hand Thread Right Hand Thread
Part Number Description Part Number Description Part Number Description Part Number Description
2 x 1/4 760607C L16191/4KNPT 760612C R16191/4KNPT 760617C L16191/4KCNPT 760622C R16191/4KCNPT
2 x 3/8 760608C L16833/8KNPT 760613C R16833/8KNPT 760618C L16833/8KCNPT 760623C R16833/8KCNPT
2 x 1/2 760609C L16441/2KNPT 760614C R16441/2KNPT 760619C L16441/2KCNPT 760624C R16441/2KCNPT
2 x 3/4 760610C L16443/4KNPT 760615C R16443/4KNPT 760620C L16443/4KCNPT 760625C R16443/4KCNPT
2 x 1 760611C L17601KNPT 760616C R17601KNPT 760621C L17601KCNPT 760626C R17601KCNPT

1600 Series Two Port Rotary Union Performance Charts

Performance Charts
Rotary Union Design

Rotary Union Design

While rotating joints come in many shapes, sizes, and configurations, they always have the same four basic components: housing, a shaft, a bearing (or bearings) and a seal.

Mechanical Seal

The heart of the Rotary Union or rotary joint is the seal.

The seal prevents the medium (water, oil, air, etc) from leaking outside the Rotary Union while the Rotary Union is in operation.

Duff-Norton uses four basic types of mechanical seals in its Rotary Unions: 1) pusher-type end face mechanical seal, 2) non-pusher type end face mechanical seal, 3) lip seals and 4) o-ring seal. Rotary Unions may have more than one seal.


The second most important part of the Rotary Union is the bearing. A Rotary Union may have only one bearing or multiple bearings.

Roller bearings, such as ball bearings and tapered roller bearings, or non-roller bearings, like graphite bearings and bronze bushings, may be used in the Rotary Union.

The bearings are always used to allow a part of the joint, either the shaft or the housing, to rotate.


The shaft is the component that carries the medium through the Rotary Union into the drum or roll. In many cases, the shaft will turn with the drum or roll. In some cases, like in larger flanged rotary Unions, the shaft may be stationary while the housing rotates. The bearings and seal are typically assembled around the shaft.


The housing is the component that holds all of the other elements of the Rotary Union together. The housing has an inlet port, which is a threaded port to which the hose supplying the medium will be attached .

The Rotary Union may also have an outlet port, if the same joint is being used both to supply fluid to a roll and to remove fluid from the roll. In smaller Rotary Unions, the housing is stationary. In larger Rotary Unions, the housing maybe bolted to the drum or roll using a flange. In these cases, the housing rotates at the same speed as the drum.

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