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. 789-9611
Mfr. Part No.PEC12R-2225F-N0024
BrandBourns
MYR3.56
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. 167-5395
Mfr. Part No.PEC12R-2225F-N0024
BrandBourns
MYR2.54
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. 167-3625
Mfr. Part No.EAW0J-B24-AE0128L
BrandBourns
MYR27.24
Each (In a Tray of 45)
units
128 Plain with Slot 6.35 mm Absolute Digital Bracket Mount 19.05mm Not Indexed 120rpm 9mm -
RS Stock No. 167-4656
Mfr. Part No.PEC11R-4220F-S0012
BrandBourns
MYR5.19
Each (In a Bag of 75)
units
12 Flat 6 mm Incremental Digital Square Wave - 20mm Not Indexed 60rpm 7mm -
RS Stock No. 737-7697
Mfr. Part No.EMS22Q51-D28-LT4
BrandBourns
MYR169.98
Each
units
256 Plain 3.17 mm Incremental Digital Square Wave Bracket Mount 22.23mm Indexed 10000rpm - -
RS Stock No. 167-4654
Mfr. Part No.PEC11R-4220F-N0012
BrandBourns
MYR5.24
Each (In a Bag of 75)
units
12 Flat 6 mm Incremental Digital Square Wave - 20mm Not Indexed 60rpm 7mm -
RS Stock No. 167-4664
Mfr. Part No.EMS22Q51-D28-LT4
BrandBourns
MYR138.53
Each (In a Box of 42)
units
256 Plain 3.17 mm Incremental Digital Square Wave Bracket Mount 22.23mm Indexed 10000rpm - -
RS Stock No. 737-7758
Mfr. Part No.PEC11R-4220F-S0012
BrandBourns
MYR6.67
Each
units
12 Flat 6 mm Incremental Digital Square Wave - 20mm Not Indexed 60rpm 7mm -
RS Stock No. 781-6830
Mfr. Part No.PEC11R-4220K-S0024
BrandBourns
MYR6.79
Each
units
24 Knurl 6 mm Incremental Digital Square Wave Through Hole 20mm - 60rpm 1mm -
RS Stock No. 161-6779
Mfr. Part No.PEC11R-4225F-N0024
BrandBourns
MYR5.086
Each (In a Bag of 75)
units
24 Flat 6 mm Incremental Digital Square Wave Through Hole 25mm Not Indexed 60rpm 1 mm, 2.6 x 1.8 mm -
RS Stock No. 263-2918
Mfr. Part No.EAW0J-B24-AE0128L
BrandBourns
MYR33.91
Each
units
128 Plain with Slot 6.35 mm Absolute Digital Bracket Mount 19.05mm Not Indexed 120rpm 9mm -
RS Stock No. 167-5385
Mfr. Part No.PEC11R-4220K-S0024
BrandBourns
MYR5.32
Each (In a Bag of 75)
units
24 Knurl 6 mm Incremental Digital Square Wave Through Hole 20mm - 60rpm 1mm -
RS Stock No. 789-9557
Mfr. Part No.PEC11R-4225F-N0024
BrandBourns
MYR6.73
Each
units
24 Flat 6 mm Incremental Digital Square Wave Through Hole 25mm Not Indexed 60rpm 1 mm, 2.6 x 1.8 mm -
RS Stock No. 263-2839
Mfr. Part No.ECW0J-B24-AC0006L
BrandBourns
MYR18.90
Each
units
6 Plain with Slot 6.35 mm Incremental Digital Square Wave Panel Mount 19mm Not Indexed 120rpm 9mm -
RS Stock No. 167-5393
Mfr. Part No.PEC11R-4215K-N0024
BrandBourns
MYR5.24
Each (In a Bag of 75)
units
24 Knurl 6 mm Incremental Digital Square Wave Through Hole 15mm Indexed 60rpm 1 mm, 2.6 x 1.8 mm -
RS Stock No. 167-4663
Mfr. Part No.EMS22D51-B28-LS5
BrandBourns
MYR139.51
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. 167-3572
Mfr. Part No.ECW0J-B24-AC0006L
BrandBourns
MYR15.58
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. 737-7751
Mfr. Part No.PEC11R-4220F-N0012
BrandBourns
MYR6.73
Each
units
12 Flat 6 mm Incremental Digital Square Wave - 20mm Not Indexed 60rpm 7mm -
RS Stock No. 789-9541
Mfr. Part No.PEC11R-4215K-N0024
BrandBourns
MYR6.73
Each
units
24 Knurl 6 mm Incremental Digital Square Wave Through Hole 15mm Indexed 60rpm 1 mm, 2.6 x 1.8 mm -
RS Stock No. 737-7694
Mfr. Part No.EMS22D51-B28-LS5
BrandBourns
MYR167.75
Each
units
512 Plain 6.34 mm Incremental Digital Square Wave Bracket Mount 22.23mm Indexed 10000rpm - -