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. 729-5592
Mfr. Part No.EC11E18244AU
HK$24.30
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. 737-7758
Mfr. Part No.PEC11R-4220F-S0012
BrandBourns
HK$13.67
Each
units
12 Flat 6 mm Incremental Digital Square Wave - 20mm Not Indexed 60rpm 7mm -
RS Stock No. 623-4287
Mfr. Part No.EM11B16140A4
HK$220.50
Each
units
16 Flat 6 mm Incremental Digital Square Wave Through Hole 15mm - - 0.7 mm, 1.3 mm, 2.1 x 1.5 mm -
RS Stock No. 172-7678
Mfr. Part No.EC11K1525401
HK$20.37
Each (In a Tray of 100)
units
15 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. 167-5430
Mfr. Part No.EMS22A50-D28-LT6
BrandBourns
HK$283.07
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. 168-0820
Mfr. Part No.DPL12V2424A24KR
HK$27.359
Each (On a Reel of 1000)
units
24 Knurl 6 mm Incremental Digital Square Wave Through Hole 24mm Not Indexed 60rpm 1.1mm -
RS Stock No. 623-4186
Mfr. Part No.EC12E1220401
HK$11.40
Each
units
12 Flat - - - Through Hole 20mm Not Indexed - - -
RS Stock No. 172-6379
Mfr. Part No.EC11E153440D
HK$22.76
Each (In a Tray of 120)
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. 729-5804
Mfr. Part No.EC12E24204A9
HK$6.57
Each
units
24 Flat 6 mm Incremental Digital Square Wave Through Hole 25mm Not Indexed - 1 mm, 2.1 x 2 mm -
RS Stock No. 167-5088
Mfr. Part No.PEC11R-4020F-N0012
BrandBourns
HK$10.95
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. 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. 172-6414
Mfr. Part No.EC1110120201
HK$60.78
Each (In a Tray of 120)
units
- Flat 6 mm Incremental Digital Square Wave Through Hole 20mm Not Indexed - 1 mm, 2.6 x 1.5 mm -
RS Stock No. 168-0823
Mfr. Part No.DPL12V2424A20FB
HK$27.359
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. 172-7691
Mfr. Part No.EC11B2024201
HK$41.659
Each (In a Tray of 70)
units
20 Flat - - - Through Hole 20mm Not Indexed - - -
RS Stock No. 623-4120
Mfr. Part No.EC11B2024201
HK$32.64
Each
units
20 Flat - - - Through Hole 20mm Not Indexed - - -
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. 161-6779
Mfr. Part No.PEC11R-4225F-N0024
BrandBourns
HK$6.878
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. 729-5719
Mfr. Part No.EC11J1520402
HK$41.18
Each
units
15 Flat 5.975 mm Incremental Digital Square Wave Surface Mount 20mm Not Indexed - 1.6 x 1.9 mm, 2.1 mm -
RS Stock No. 169-1876
Mfr. Part No.RAME027R10712AB
BrandVishay
HK$3,691.61
1 Box of 1
Box(es)
- Plain 3 mm Absolute - Panel Mount 18.9mm Not Indexed - - 20mA
RS Stock No. 737-7742
Mfr. Part No.PEC11R-4215K-S0024
BrandBourns
HK$20.55
Each
units
24 Knurl 6 mm Incremental Digital Square Wave Through Hole 15mm Not Indexed 60rpm 1 mm, 2.6 x 1.8 mm -
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