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. 167-4648
Mfr. Part No.PEC11R-4020F-S0024
BrandBourns
TWD40.40
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. 737-7764
Mfr. Part No.PEC11R-4230F-S0024
BrandBourns
TWD68.00
Each
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. 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. 167-4649
Mfr. Part No.PEC11R-4115F-S0018
BrandBourns
TWD37.60
Each (In a Bag of 75)
units
18 Flat 6 mm Incremental Digital Square Wave Through Hole 15mm Not Indexed 60rpm 1 mm, 2.6 x 1.8 mm -
RS Stock No. 729-5606
Mfr. Part No.EC11E18244A5
TWD158.00
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. 161-6779
Mfr. Part No.PEC11R-4225F-N0024
BrandBourns
TWD43.40
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. 729-5924
Mfr. Part No.SRGPWJ0200
TWD156.00
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. 729-5860
Mfr. Part No.EC12D1564404
TWD59.00
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. 729-5561
Mfr. Part No.EC11E15204A3
TWD131.00
Each
units
15 Flat 6 mm Incremental Digital Square Wave Through Hole 20mm Not Indexed - 1 mm, 2.6 x 1.5 mm -
RS Stock No. 172-6381
Mfr. Part No.SRGP400100
TWD55.30
Each (On a Reel of 800)
units
12 Hollow 9.23 mm Incremental Digital Square Wave Surface Mount - Not Indexed - 1.6mm -
RS Stock No. 729-5678
Mfr. Part No.EC11E152U402
TWD396.00
Each
units
15 Knurl 9 mm Incremental Digital Square Wave Through Hole 26.4mm Not Indexed - 1 mm, 2.6 x 1.5 mm -
RS Stock No. 789-9517
Mfr. Part No.PEC11R-4020F-N0024
BrandBourns
TWD57.00
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. 789-9591
Mfr. Part No.PEC12R-2120F-S0012
BrandBourns
TWD40.00
Each
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. 136-1846
Mfr. Part No.DPL12SV2424A25K3
TWD161.80
Each (In a Box of 1000)
units
24 Knurl 6.8 mm Incremental Digital Square Wave Through Hole 25mm Not Indexed 60rpm 1 mm, 1.1 mm -
RS Stock No. 172-6400
Mfr. Part No.EC11E15244C0
TWD175.40
Each (In a Tray of 120)
units
15 Flat 6 mm Incremental Digital Square Wave Through Hole 20mm - - 1 mm, 2.6 x 1.5 mm -
RS Stock No. 167-4650
Mfr. Part No.PEC11R-4015F-S0024
BrandBourns
TWD39.00
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. 168-0822
Mfr. Part No.DPL12V2424A20FR
TWD126.80
Each (On a Reel of 1000)
units
24 Flat 6 mm Incremental Digital Square Wave Through Hole 20mm Not Indexed 60rpm 1.1mm -
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. 729-5889
Mfr. Part No.EM20B4014000
TWD3,925.00
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. 729-5854
Mfr. Part No.EC12D1524403
TWD53.00
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 -