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"1650 Series" Rotary Union

Model:  1650 Series / SRU-4095

Part N° Description Nominal Pipe Size Overall Length (F) Flats on (I) Diameter Guide Price Quantity
F1619BKNPT 1/4 3.85 .94 Quote Required
F1683BKNPT 3/8 5.11 1.49 Quote Required
F1644BK1/2NPT 1/2 6.49 1.77 Quote Required
F1644BK3/4NPT 3/4 5.70 1.77 Quote Required
F1760BKNPT 1 8.26 1.96 Quote Required
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Corrosion resistant nickle plated steel rotary union with the option of fully stainless steel.

1650 Series Rotary Union

1650 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.

1650 Series Two Port Rotary Union Diagram

1650 Series Two Port Rotary Union Diagram

Nominal Pipe Size A B C (NPT) D E F G H I Flats on (I) Diameter J K L M
1/4 .47 1.73 1/4 1.96 GR15 3.85 2.55 .11 1.18 .94 .78 1.37 .33 .39
3/8 .47 2.42 3/8 2.36 GR25 5.11 3.5 .27 1.65 1.49 1.18 1.77 .33 355
1/2 .47 2.63 1/2 3.14 GR35 6.49 3.85 .47 1.96 1.77 1.77 2.55 .33 .82
3/4 .47 2.63 3/4 3.14 GR35 5.70 3.85 .47 1.96 1.77 1.77 2.55 .33 .82
1 .59 3.79 1 3.54 GR50 8.26 5.51 .70 2.36 1.96 2.36 3.14 .43


1650 Series Two Port Rotary Union Specifications

Nominal Pipe Size NIckel Plated Steel Stainless Steel
Nickle Plated Steel Shaft Hardened Shaft Nickel Plated Steel Shaft Hardened Shaft
Part number Description Part number Description Part Number Description Part number Description
1/4 760559C F1619BKNPT 760592C F1619BKCNPT 760597C F1619BINPT 760602C F1619BICNPT
3/8 760560C F1683BKNPT 760593C F1683BKCNPT 760598C F1683BINPT 760603C F1683BICNPT
1/2 760561C F1644BK1/2NPT 760594C F1644BKC1/2NPT 760599C F1644BI1/2NPT 760604C F1644BIC1/2NPT
3/4 760562C F1644BK3/4NPT 760595C F1644BKC3/4NPT 760600C F1644BI3/4NPT 760605C F1644BIC3/4NPT
1 760563C F1760BKNPT 760596C F1760BKCNPT 760601C F1760BINPT 760606C F1760BICNPT

1650 Series Two Port Rotary Union Performance Charts

1650 Series Two Port Rotary Union 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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