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. 167-4663
Mfr. Part No.EMS22D51-B28-LS5
BrandBourns
$51.10
Each (In a Box of 42)
units
512 Plain 6.34 mm Incremental Digital Square Wave Bracket Mount 22.23mm Indexed 10000rpm - -
RS Stock No. 167-5389
Mfr. Part No.PEC11R-4020F-N0024
BrandBourns
$1.91
Each (In a Bag of 75)
units
24 Flat 6 mm Incremental Digital Square Wave Through Hole 20mm Not Indexed 60rpm 1 mm, 2.6 x 1.8 mm -
RS Stock No. 623-4186
Mfr. Part No.EC12E1220401
$3.73
Each
units
12 Flat - - - Through Hole 20mm Not Indexed - - -
RS Stock No. 623-4293
Mfr. Part No.EC11E15244C0
$20.98
Each
units
15 Flat 6 mm Incremental Digital Square Wave Through Hole 20mm - - 2.6 x 1.5 mm, 1 mm -
RS Stock No. 789-9611
Mfr. Part No.PEC12R-2225F-N0024
BrandBourns
$1.30
Each
units
24 Flat 6 mm Incremental Digital Square Wave Through Hole 15mm Not Indexed 100rpm 1 mm, 2 x 2.1 mm -
RS Stock No. 781-6830
Mfr. Part No.PEC11R-4220K-S0024
BrandBourns
$2.52
Each
units
24 Knurl 6 mm Incremental Digital Square Wave Through Hole 20mm - 60rpm 1mm -
RS Stock No. 172-6400
Mfr. Part No.EC11E15244C0
$8.261
Each (In a Tray of 120)
units
15 Flat 6 mm Incremental Digital Square Wave Through Hole 20mm - - 1 mm, 2.6 x 1.5 mm -
RS Stock No. 167-5385
Mfr. Part No.PEC11R-4220K-S0024
BrandBourns
$1.95
Each (In a Bag of 75)
units
24 Knurl 6 mm Incremental Digital Square Wave Through Hole 20mm - 60rpm 1mm -
RS Stock No. 789-9664
Mfr. Part No.PEC12R-4230F-N0024
BrandBourns
$1.39
Each
units
24 Flat 6 mm Incremental Digital Square Wave Through Hole 30mm Not Indexed 100rpm 1 mm, 2 x 2.1 mm -
RS Stock No. 167-5395
Mfr. Part No.PEC12R-2225F-N0024
BrandBourns
$0.932
Each (In a Bag of 75)
units
24 Flat 6 mm Incremental Digital Square Wave Through Hole 15mm Not Indexed 100rpm 1 mm, 2 x 2.1 mm -
RS Stock No. 172-6303
Mfr. Part No.EC12E1220401
$1.381
Each (In a Tray of 120)
units
12 Flat - - - Through Hole 20mm Not Indexed - - -
RS Stock No. 167-5402
Mfr. Part No.PEC12R-4230F-N0024
BrandBourns
$0.888
Each (In a Bag of 75)
units
24 Flat 6 mm Incremental Digital Square Wave Through Hole 30mm Not Indexed 100rpm 1 mm, 2 x 2.1 mm -
RS Stock No. 789-9591
Mfr. Part No.PEC12R-2120F-S0012
BrandBourns
$1.60
Each
units
12 Flat 6 mm Incremental Digital Square Wave Through Hole 9mm Not Indexed 100rpm 1 mm, 2 x 2.1 mm -
RS Stock No. 161-6782
Mfr. Part No.PEC12R-2120F-S0012
BrandBourns
$1.135
Each (In a Bag of 75)
units
12 Flat 6 mm Incremental Digital Square Wave Through Hole 9mm Not Indexed 100rpm 1 mm, 2 x 2.1 mm -
RS Stock No. 729-5924
Mfr. Part No.SRGPWJ0200
$3.65
Each
units
16 Hollow 18.5 mm Incremental Digital Square Wave Through Hole - Not Indexed - 1 mm, 2.5 x 1.6 mm, 2.55 mm -
RS Stock No. 263-2839
Mfr. Part No.ECW0J-B24-AC0006L
BrandBourns
$6.63
Each
units
6 Plain with Slot 6.35 mm Incremental Digital Square Wave Panel Mount 19mm Not Indexed 120rpm 9mm -
RS Stock No. 167-3572
Mfr. Part No.ECW0J-B24-AC0006L
BrandBourns
$5.71
Each (In a Tray of 45)
units
6 Plain with Slot 6.35 mm Incremental Digital Square Wave Panel Mount 19mm Not Indexed 120rpm 9mm -
RS Stock No. 729-5703
Mfr. Part No.EC11EBB24C03
$22.20
Each
units
15 Flat (Inner Shaft), Slot (Outer Shaft) 3.5 (Inner Shaft) mm, 6 (Outer Shaft) mm Incremental Digital Square Wave Through Hole 25mm Not Indexed - 1 mm, 2.6 x 1.5 mm -
RS Stock No. 167-4651
Mfr. Part No.PEC11R-4215K-S0024
BrandBourns
$1.86
Each (In a Bag of 75)
units
24 Knurl 6 mm Incremental Digital Square Wave Through Hole 15mm Not Indexed 60rpm 1 mm, 2.6 x 1.8 mm -
RS Stock No. 172-8124
Mfr. Part No.SRGPWJ0200
$3.30
Each (In a Tray of 200)
units
16 Hollow 18.5 mm Incremental Digital Square Wave Through Hole - Not Indexed - 1 mm, 2.55 mm, 2.5 x 1.6 mm -
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