Mechanical Rotary Encoders

Mechanical rotary encoders, also called shaft encoders, are electro-mechanical devices that convert the angular motions (movement around fixed points) of rotary shafts into either analogue or digital signals.

What are mechanical rotary encoders used for?

Applications that require precision shaft rotation (movement around a specific point) make use of mechanical rotary encoders.

These include industrial control machinery in factories, rotating radar platforms in satellite structures or computer input devices like trackballs and mice.


Types of mechanical rotary encoders

Absolute encoders:

  • have tracking functions to determine specific shaft positioning points in industrial equipment like CNC machines, lathes and bore machines.
  • maintain positioning data even when power is cut from the system. When the system is switched on again it begins operating from the point where it stopped previously.


Incremental (relative) encoders:

  • record deviations in shaft position points over certain time frames. With each new time frame after power is cut and switched on again the encoder starts recording from a predetermined reference and measures the distance between the previous point and the current point.

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Description Price Pulses Per Revolution Shaft Style Shaft Diameter Encoder Reading Encoder Signal Mounting Type Shaft Length Index Output Maximum Operating Speed Mounting Hole Diameter Current Rating
RS Stock No. 172-8305
Mfr. Part No.DPL12VN24A24KR
kr 33,775
Each (In a Box of 1000)
Units
24 Knurl 6 mm Incremental Digital Square Wave Through Hole 24mm Not Indexed 60rpm 1.1mm -
RS Stock No. 663-3158
Mfr. Part No.DPL12VN24A24KR
kr 40,48
Each
Units
24 Knurl 6 mm Incremental Digital Square Wave Through Hole 24mm Not Indexed 60rpm 1.1mm -
RS Stock No. 663-3230
Mfr. Part No.DPL12SV2424A25K3
kr 72,18
Each
Units
24 Knurl 6.8 mm Incremental Digital Square Wave Through Hole 25mm Not Indexed 60rpm 1 mm, 1.1 mm -
RS Stock No. 168-0810
Mfr. Part No.DPL12SV2424A25K1
kr 27,836
Each (In a Box of 250)
Units
24 Knurl 6.8 mm Incremental Digital Square Wave Through Hole 25mm Not Indexed 60rpm 1 mm, 1.1 mm -
RS Stock No. 663-3186
Mfr. Part No.DPL12V2424A20FG
kr 36,39
Each
Units
24 Flat 6 mm Incremental Digital Square Wave Through Hole 20mm Not Indexed 60rpm 1.1mm -
RS Stock No. 663-3233
Mfr. Part No.DPL12SV2424A21F3
kr 53,54
Each
Units
24 Flat 6.8 mm Incremental Digital Square Wave Through Hole 21mm Not Indexed 60rpm 1 mm, 1.1 mm -
RS Stock No. 136-1847
Mfr. Part No.DPL12SV2424A21F3
kr 40,059
Each (In a Box of 1000)
Units
24 Flat 6.8 mm Incremental Digital Square Wave Through Hole 21mm Not Indexed 60rpm 1 mm, 1.1 mm -
RS Stock No. 663-3211
Mfr. Part No.DPL12SVN24A21F3
kr 24,63
Each
Units
24 Flat 6.8 mm Incremental Digital Square Wave Through Hole 21mm Not Indexed 60rpm 1 mm, 1.1 mm -
RS Stock No. 663-3170
Mfr. Part No.DPL12V2424A24KR
kr 40,48
Each
Units
24 Knurl 6 mm Incremental Digital Square Wave Through Hole 24mm Not Indexed 60rpm 1.1mm -
RS Stock No. 164-0519
Mfr. Part No.DPL12SVN24A25K2
kr 41,271
Each (In a Box of 1000)
Units
24 Knurl 6.8 mm Incremental Digital Square Wave Through Hole 25mm Not Indexed 60rpm 1 mm, 1.1 mm -
RS Stock No. 663-3189
Mfr. Part No.DPL12V2424A20FR
kr 24,02
Each
Units
24 Flat 6 mm Incremental Digital Square Wave Through Hole 20mm Not Indexed 60rpm 1.1mm -
RS Stock No. 663-3192
Mfr. Part No.DPL12SVN24A25K1
kr 29,16
Each
Units
24 Knurl 6.8 mm Incremental Digital Square Wave Through Hole 25mm Not Indexed 60rpm 1 mm, 1.1 mm -
RS Stock No. 663-3182
Mfr. Part No.DPL12V2424A24KG
kr 21,38
Each
Units
24 Knurl 6 mm Incremental Digital Square Wave Through Hole 24mm Not Indexed 60rpm 1.1mm -
RS Stock No. 168-0823
Mfr. Part No.DPL12V2424A20FB
kr 32,048
Each (On a Reel of 1000)
Units
24 Flat 6 mm Incremental Digital Square Wave Through Hole 20mm Not Indexed 60rpm 1.1mm -
RS Stock No. 663-3215
Mfr. Part No.DPL12SV2424A25K1
kr 28,25
Each
Units
24 Knurl 6.8 mm Incremental Digital Square Wave Through Hole 25mm Not Indexed 60rpm 1 mm, 1.1 mm -
RS Stock No. 663-3160
Mfr. Part No.DPL12VN24A24KG
kr 21,38
Each
Units
24 Knurl 6 mm Incremental Digital Square Wave Through Hole 24mm Not Indexed 60rpm 1.1mm -
RS Stock No. 663-3167
Mfr. Part No.DPL12VN24A20FR
kr 40,48
Each
Units
24 Flat 6 mm Incremental Digital Square Wave Through Hole 20mm Not Indexed 60rpm 1.1mm -
RS Stock No. 168-0820
Mfr. Part No.DPL12V2424A24KR
kr 32,048
Each (On a Reel of 1000)
Units
24 Knurl 6 mm Incremental Digital Square Wave Through Hole 24mm Not Indexed 60rpm 1.1mm -
RS Stock No. 168-0829
Mfr. Part No.DPL12SVN24A21F3
kr 41,271
Each (In a Box of 1000)
Units
24 Flat 6.8 mm Incremental Digital Square Wave Through Hole 21mm Not Indexed 60rpm 1 mm, 1.1 mm -
RS Stock No. 164-0521
Mfr. Part No.DPL12V2424A20FG
kr 32,048
Each (In a Box of 1000)
Units
24 Flat 6 mm Incremental Digital Square Wave Through Hole 20mm Not Indexed 60rpm 1.1mm -