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. 167-3625
Mfr. Part No.EAW0J-B24-AE0128L
BrandBourns
PHP328.093
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. 263-2918
Mfr. Part No.EAW0J-B24-AE0128L
BrandBourns
PHP580.91
Each
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
PHP3,140.92
Each
units
1024 (Position) Plain 3.17 mm Absolute Digital Square Wave Through Hole 22.23mm Not Indexed 10000rpm 10.67mm -
RS Stock No. 167-5430
Mfr. Part No.EMS22A50-D28-LT6
BrandBourns
PHP2,082.505
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. 167-5429
Mfr. Part No.PEC11R-4120F-S0018
BrandBourns
PHP66.371
Each (In a Bag of 75)
units
18 Flat 6 mm Incremental Digital Square Wave Through Hole 20mm - 60rpm 1mm -
RS Stock No. 167-4659
Mfr. Part No.PEC11R-4220F-S0024
BrandBourns
PHP59.167
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. 737-7767
Mfr. Part No.PEC11R-4220F-S0024
BrandBourns
PHP76.15
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. 781-6827
Mfr. Part No.PEC11R-4120F-S0018
BrandBourns
PHP98.27
Each
units
18 Flat 6 mm Incremental Digital Square Wave Through Hole 20mm - 60rpm 1mm -
RS Stock No. 781-6830
Mfr. Part No.PEC11R-4220K-S0024
BrandBourns
PHP79.91
Each
units
24 Knurl 6 mm Incremental Digital Square Wave Through Hole 20mm - 60rpm 1mm -
RS Stock No. 167-5385
Mfr. Part No.PEC11R-4220K-S0024
BrandBourns
PHP59.167
Each (In a Bag of 75)
units
24 Knurl 6 mm Incremental Digital Square Wave Through Hole 20mm - 60rpm 1mm -
RS Stock No. 167-5393
Mfr. Part No.PEC11R-4215K-N0024
BrandBourns
PHP58.653
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. 789-9541
Mfr. Part No.PEC11R-4215K-N0024
BrandBourns
PHP86.44
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. 789-9517
Mfr. Part No.PEC11R-4020F-N0024
BrandBourns
PHP86.44
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. 167-5389
Mfr. Part No.PEC11R-4020F-N0024
BrandBourns
PHP52.993
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. 189-4750
Mfr. Part No.AEAT-6012-A06
BrandBroadcom
PHP1,153.866
Each (In a Tube of 280)
units
1024 (Positions) - 6 mm Absolute - Screw Mount 8.5mm - 12000rpm 17mm 20mA
RS Stock No. 714-2693
Mfr. Part No.AEAT-6012-A06
BrandBroadcom
PHP1,546.21
Each
units
- Plain 6 mm Absolute - - 8.5mm - 12000rpm 0.13mm -
RS Stock No. 729-5839
Mfr. Part No.EC12E1220813
PHP133.09
Each
units
12 Flat 6 mm Incremental Digital Square Wave Through Hole 25mm Not Indexed - 1 mm, 2.1 x 2 mm -
RS Stock No. 623-4079
Mfr. Part No.EC11B15244A7
PHP380.72
Each
units
15 Flat - - - Through Hole 20mm Not Indexed - - -
RS Stock No. 178-2944
Mfr. Part No.AEAT-6010-A06
BrandBroadcom
PHP1,038.273
Each (In a Tray of 280)
units
- Plain 6 mm Absolute - Screw Mount 8.5mm Not Indexed 12000rpm 0.13mm -
RS Stock No. 172-6318
Mfr. Part No.EC12E1220813
PHP85.921
Each (In a Tray of 95)
units
12 Flat 6 mm Incremental Digital Square Wave Through Hole 25mm Not Indexed - 1 mm, 2.1 x 2 mm -