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. 789-9557
Mfr. Part No.PEC11R-4225F-N0024
BrandBourns
HK$14.22
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. 737-7748
Mfr. Part No.PEC11R-4215F-S0024
BrandBourns
HK$13.95
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. 167-5398
Mfr. Part No.PEC12R-4030F-S0012
BrandBourns
HK$7.23
Each (In a Bag of 75)
units
12 Flat 6 mm Incremental Digital Square Wave Through Hole 30mm Not Indexed 100rpm 1 mm, 2 x 2.1 mm -
RS Stock No. 729-5889
Mfr. Part No.EM20B4014000
HK$240.00
Each
units
40 Flat 4 mm Incremental Digital Square Wave Through Hole 16mm Not Indexed - 0.6 mm, 2.6 x 1.8 mm -
RS Stock No. 164-0521
Mfr. Part No.DPL12V2424A20FG
HK$28.665
Each (In a Box of 1000)
units
24 Flat 6 mm Incremental Digital Square Wave Through Hole 20mm Not Indexed 60rpm 1.1mm -
RS Stock No. 185-4391
Mfr. Part No.482016514001
HK$32.83
Each (In a Pack of 2)
units
15 - 6 mm Incremental - Through Hole 20mm - - - 10mA
RS Stock No. 729-5927
Mfr. Part No.SRGPWJ0500
HK$28.44
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. 781-6821
Mfr. Part No.PEC11R-4215F-N0024
BrandBourns
HK$12.07
Each
units
24 Flat 6 mm Incremental Digital Square Wave Through Hole 15mm - 60rpm 1mm -
RS Stock No. 167-4654
Mfr. Part No.PEC11R-4220F-N0012
BrandBourns
HK$10.868
Each (In a Bag of 75)
units
12 Flat 6 mm Incremental Digital Square Wave - 20mm Not Indexed 60rpm 7mm -
RS Stock No. 161-6783
Mfr. Part No.PEC12R-2220F-S0024
BrandBourns
HK$5.798
Each (In a Bag of 75)
units
24 Flat 6 mm Incremental Digital Square Wave Through Hole 9mm Not Indexed 100rpm 1 mm, 2 x 2.1 mm -
RS Stock No. 729-5817
Mfr. Part No.EC12E24404A8
HK$11.28
Each
units
24 Flat 6 mm Incremental Digital Square Wave Through Hole 20mm Not Indexed - 1 mm, 2.1 x 2 mm -
RS Stock No. 167-5385
Mfr. Part No.PEC11R-4220K-S0024
BrandBourns
HK$11.12
Each (In a Bag of 75)
units
24 Knurl 6 mm Incremental Digital Square Wave Through Hole 20mm - 60rpm 1mm -
RS Stock No. 663-3195
Mfr. Part No.DPL12V2424A24KB
HK$26.10
Each
units
24 Knurl 6 mm Incremental Digital Square Wave Through Hole 24mm Not Indexed 60rpm 1.1mm -
RS Stock No. 729-5854
Mfr. Part No.EC12D1524403
HK$7.96
Each
units
15 Flat 5.975 mm Incremental Digital Square Wave Through Hole 17.5mm Not Indexed - 1.05 mm, 2.1 mm, 2.15 x 2.05 mm -
RS Stock No. 729-5628
Mfr. Part No.EC11K0925401
HK$79.65
Each
units
9 Flat 5.975 mm Incremental Digital Square Wave Through Hole 20mm Not Indexed - 1.05 mm, 1.6 x 1.9 mm, 2.1 mm, 2.65 x 1.55 mm -
RS Stock No. 179-0687
Mfr. Part No.291V1022F832AB
BrandCTS
HK$104.833
Each (In a Tray of 72)
units
8 Flat 6.35 mm - Digital Through Hole 17.27mm - 30rpm 0.76mm 2mA
RS Stock No. 729-5577
Mfr. Part No.EC11E1830401
HK$21.40
Each
units
18 Flat 6 mm Incremental Digital Square Wave Through Hole 20mm Not Indexed - 1 mm, 2.6 x 1.5 mm -
RS Stock No. 729-5794
Mfr. Part No.EC12E1240301
HK$15.87
Each
units
12 Hollow 6 mm Incremental Digital Square Wave Through Hole 8.5mm Not Indexed - 1 mm, 2.1 x 2 mm -
RS Stock No. 167-5390
Mfr. Part No.PEC11R-4115K-S0018
BrandBourns
HK$10.88
Each (In a Bag of 75)
units
18 Knurl 6 mm Incremental Digital Square Wave Through Hole 15mm Not Indexed 60rpm 1 mm, 2.6 x 1.8 mm -
RS Stock No. 729-5775
Mfr. Part No.EC12E1220406
HK$8.21
Each
units
12 Flat 6 mm Incremental Digital Square Wave Through Hole 20mm Not Indexed - 1 mm, 2.1 x 2 mm -
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