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. 663-3230
Mfr. Part No.DPL12SV2424A25K3
$9.91
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. 136-1846
Mfr. Part No.DPL12SV2424A25K3
$7,017.60
1 Box of 1000
Box(es)
24 Knurl 6.8 mm Incremental Digital Square Wave Through Hole 25mm Not Indexed 60rpm 1 mm, 1.1 mm -
RS Stock No. 663-3209
Mfr. Part No.DPL12SVN24A21F2
$7.25
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. 168-0825
Mfr. Part No.DPL12SVN24A21F2
$7,017.60
1 Reel of 1000
Reel(s)
24 Flat 6.8 mm Incremental Digital Square Wave Through Hole 21mm Not Indexed 60rpm 1 mm, 1.1 mm -
RS Stock No. 168-0828
Mfr. Part No.DPL12VN24A24KG
$5,620.20
1 Box of 1000
Box(es)
24 Knurl 6 mm Incremental Digital Square Wave Through Hole 24mm Not Indexed 60rpm 1.1mm -
RS Stock No. 663-3160
Mfr. Part No.DPL12VN24A24KG
$4.05
Each
units
24 Knurl 6 mm Incremental Digital Square Wave Through Hole 24mm Not Indexed 60rpm 1.1mm -
RS Stock No. 168-0820
Mfr. Part No.DPL12V2424A24KR
$5,620.20
1 Reel of 1000
Reel(s)
24 Knurl 6 mm Incremental Digital Square Wave Through Hole 24mm Not Indexed 60rpm 1.1mm -
RS Stock No. 136-1847
Mfr. Part No.DPL12SV2424A21F3
$7,017.60
1 Box of 1000
Box(es)
24 Flat 6.8 mm Incremental Digital Square Wave Through Hole 21mm Not Indexed 60rpm 1 mm, 1.1 mm -
RS Stock No. 164-0518
Mfr. Part No.DPL12SV2424A25K2
$7,017.60
1 Box of 1000
Box(es)
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
$4.22
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
$8.23
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. 663-3211
Mfr. Part No.DPL12SVN24A21F3
$5.22
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. 663-3167
Mfr. Part No.DPL12VN24A20FR
$6.70
Each
units
24 Flat 6 mm Incremental Digital Square Wave Through Hole 20mm Not Indexed 60rpm 1.1mm -
RS Stock No. 168-0819
Mfr. Part No.DPL12VN24A20FR
$5.62
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. 663-3227
Mfr. Part No.DPL12SV2424A25K2
$7.14
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. 663-3170
Mfr. Part No.DPL12V2424A24KR
$7.18
Each
units
24 Knurl 6 mm Incremental Digital Square Wave Through Hole 24mm Not Indexed 60rpm 1.1mm -
RS Stock No. 164-0521
Mfr. Part No.DPL12V2424A20FG
$5,620.20
1 Box of 1000
Box(es)
24 Flat 6 mm Incremental Digital Square Wave Through Hole 20mm Not Indexed 60rpm 1.1mm -
RS Stock No. 168-0829
Mfr. Part No.DPL12SVN24A21F3
$7,017.60
1 Box of 1000
Box(es)
24 Flat 6.8 mm Incremental Digital Square Wave Through Hole 21mm Not Indexed 60rpm 1 mm, 1.1 mm -
RS Stock No. 663-3198
Mfr. Part No.DPL12V2424A20FB
$8.17
Each
units
24 Flat 6 mm Incremental Digital Square Wave Through Hole 20mm Not Indexed 60rpm 1.1mm -
RS Stock No. 663-3205
Mfr. Part No.DPL12SVN24A25K2
$9.19
Each
units
24 Knurl 6.8 mm Incremental Digital Square Wave Through Hole 25mm Not Indexed 60rpm 1 mm, 1.1 mm -