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. 737-7748
Mfr. Part No.PEC11R-4215F-S0024
BrandBourns
TWD50.00
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. 167-4653
Mfr. Part No.PEC11R-4215F-S0024
BrandBourns
TWD40.40
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. 789-9523
Mfr. Part No.PEC11R-4115K-S0018
BrandBourns
TWD65.00
Each
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. 167-5390
Mfr. Part No.PEC11R-4115K-S0018
BrandBourns
TWD49.20
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. 167-5399
Mfr. Part No.PEC12R-4025F-S0024
BrandBourns
TWD31.40
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 -
RS Stock No. 789-9649
Mfr. Part No.PEC12R-4025F-S0024
BrandBourns
TWD45.00
Each
units
24 Flat 6 mm Incremental Digital Square Wave Through Hole 25mm Not Indexed 100rpm 1 mm, 2 x 2.1 mm -
RS Stock No. 737-7751
Mfr. Part No.PEC11R-4220F-N0012
BrandBourns
TWD58.00
Each
units
12 Flat 6 mm Incremental Digital Square Wave - 20mm Not Indexed 60rpm 7mm -
RS Stock No. 161-6782
Mfr. Part No.PEC12R-2120F-S0012
BrandBourns
TWD30.50
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. 781-6815
Mfr. Part No.PEC11R-4215F-S0012
BrandBourns
TWD50.00
Each
units
12 Flat 6 mm Incremental Digital Square Wave Through Hole 15mm - 60rpm 1mm -
RS Stock No. 167-4663
Mfr. Part No.EMS22D51-B28-LS5
BrandBourns
TWD1,134.80
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. 737-7745
Mfr. Part No.PEC11R-4125F-S0018
BrandBourns
TWD65.00
Each
units
18 Flat 6 mm Incremental Digital Square Wave - 25mm Not Indexed 60rpm 7mm -
RS Stock No. 167-4658
Mfr. Part No.PEC11R-4230F-S0024
BrandBourns
TWD43.80
Each (In a Bag of 75)
units
24 Flat 6 mm Incremental Digital Square Wave Through Hole 30mm Not Indexed 60rpm 1 mm, 2.6 x 1.8 mm -
RS Stock No. 205-9736
Mfr. Part No.PEC11H-4120F-S0020
BrandBourns
TWD66.80
Each (In a Tray of 75)
units
20 - 6 mm Incremental Digital Square Wave PCB Mount 20mm Not Indexed - - -
RS Stock No. 167-5400
Mfr. Part No.PEC12R-4220F-S0012
BrandBourns
TWD30.30
Each (In a Bag of 75)
units
12 Flat 6 mm Incremental Digital Square Wave Through Hole 20mm Not Indexed 100rpm 1 mm, 2 x 2.1 mm -
RS Stock No. 781-6809
Mfr. Part No.PEC12R-4230F-S0024
BrandBourns
TWD40.00
Each
units
24 Flat 6 mm Incremental Digital Square Wave Through Hole 30mm - 100rpm 1mm -
RS Stock No. 167-4664
Mfr. Part No.EMS22Q51-D28-LT4
BrandBourns
TWD1,126.80
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. 167-4659
Mfr. Part No.PEC11R-4220F-S0024
BrandBourns
TWD42.30
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. 167-4660
Mfr. Part No.PEC12R-4220F-S0024
BrandBourns
TWD31.20
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. 781-6830
Mfr. Part No.PEC11R-4220K-S0024
BrandBourns
TWD50.00
Each
units
24 Knurl 6 mm Incremental Digital Square Wave Through Hole 20mm - 60rpm 1mm -
RS Stock No. 161-6783
Mfr. Part No.PEC12R-2220F-S0024
BrandBourns
TWD27.80
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 -