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. 737-7767
Mfr. Part No.PEC11R-4220F-S0024
BrandBourns
HK$15.55
Each
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. 167-4659
Mfr. Part No.PEC11R-4220F-S0024
BrandBourns
HK$11.196
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. 167-3625
Mfr. Part No.EAW0J-B24-AE0128L
BrandBourns
HK$58.70
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. 789-9490
Mfr. Part No.EMS22A50-D28-LT6
BrandBourns
HK$423.41
Each
units
1024 (Position) Plain 3.17 mm Absolute Digital Square Wave Through Hole 22.23mm Not Indexed 10000rpm 10.67mm -
RS Stock No. 789-9517
Mfr. Part No.PEC11R-4020F-N0024
BrandBourns
HK$15.11
Each
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. 737-7773
Mfr. Part No.PEC12R-4220F-S0024
BrandBourns
HK$11.40
Each
units
24 Flat 6 mm Incremental Digital Square Wave Through Hole 9mm Not Indexed 100rpm 1 mm, 2.1 x 2 mm -
RS Stock No. 789-9513
Mfr. Part No.PEC11R-4020F-N0012
BrandBourns
HK$15.10
Each
units
12 Flat 6 mm Incremental Digital Square Wave Through Hole 20mm Not Indexed 60rpm 1 mm, 2.6 x 1.8 mm -
RS Stock No. 167-4650
Mfr. Part No.PEC11R-4015F-S0024
BrandBourns
HK$11.196
Each (In a Bag of 75)
units
24 Flat 6 mm Incremental Digital Square Wave Through Hole 15mm Not Indexed 60rpm 1 mm, 2.6 x 1.8 mm -
RS Stock No. 167-4660
Mfr. Part No.PEC12R-4220F-S0024
BrandBourns
HK$8.281
Each (In a Bag of 75)
units
24 Flat 6 mm Incremental Digital Square Wave Through Hole 20mm Not Indexed 100rpm 1 mm, 2.1 x 2 mm -
RS Stock No. 167-5389
Mfr. Part No.PEC11R-4020F-N0024
BrandBourns
HK$11.279
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. 167-5088
Mfr. Part No.PEC11R-4020F-N0012
BrandBourns
HK$11.497
Each (In a Bag of 75)
units
12 Flat 6 mm Incremental Digital Square Wave Through Hole 20mm Not Indexed 60rpm 1 mm, 2.6 x 1.8 mm -
RS Stock No. 737-7739
Mfr. Part No.PEC11R-4015F-S0024
BrandBourns
HK$15.15
Each
units
24 Flat 6 mm Incremental Digital Square Wave Through Hole 15mm Not Indexed 60rpm 1 mm, 2.6 x 1.8 mm -
RS Stock No. 167-5430
Mfr. Part No.EMS22A50-D28-LT6
BrandBourns
HK$306.925
Each (In a Box of 42)
units
1024 (Position) Plain 3.17 mm Absolute Digital Square Wave Through Hole 22.23mm Not Indexed 10000rpm 10.67mm -
RS Stock No. 167-4656
Mfr. Part No.PEC11R-4220F-S0012
BrandBourns
HK$11.196
Each (In a Bag of 75)
units
12 Flat 6 mm Incremental Digital Square Wave - 20mm Not Indexed 60rpm 7mm -
RS Stock No. 263-2918
Mfr. Part No.EAW0J-B24-AE0128L
BrandBourns
HK$87.02
Each
units
128 Plain with Slot 6.35 mm Absolute Digital Bracket Mount 19.05mm Not Indexed 120rpm 9mm -
RS Stock No. 737-7758
Mfr. Part No.PEC11R-4220F-S0012
BrandBourns
HK$15.88
Each
units
12 Flat 6 mm Incremental Digital Square Wave - 20mm Not Indexed 60rpm 7mm -
RS Stock No. 167-5310
Mfr. Part No.PEC12R-4225F-S0024
BrandBourns
HK$8.075
Each (In a Bag of 75)
units
24 Flat 6 mm Incremental Digital Square Wave Through Hole 25mm - 100rpm 1mm -
RS Stock No. 781-6830
Mfr. Part No.PEC11R-4220K-S0024
BrandBourns
HK$15.56
Each
units
24 Knurl 6 mm Incremental Digital Square Wave Through Hole 20mm - 60rpm 1mm -
RS Stock No. 737-7748
Mfr. Part No.PEC11R-4215F-S0024
BrandBourns
HK$14.37
Each
units
24 Flat 6 mm Incremental Digital Square Wave Through Hole 15mm Not Indexed 60rpm 1 mm, 2.6 x 1.8 mm -
RS Stock No. 167-5399
Mfr. Part No.PEC12R-4025F-S0024
BrandBourns
HK$8.316
Each (In a Bag of 75)
units
24 Flat 6 mm Incremental Digital Square Wave Through Hole 25mm Not Indexed 100rpm 1 mm, 2 x 2.1 mm -