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. 623-4079
Mfr. Part No.EC11B15244A7
HK$30.78
Each
units
15 Flat - - - Through Hole 20mm Not Indexed - - -
RS Stock No. 172-8134
Mfr. Part No.EC11B15242AF
HK$40.35
Each (In a Tray of 70)
units
15 Flat 6 mm Incremental Digital Square Wave Through Hole 20mm Not Indexed - 1 mm, 2.1 x 1.8 mm -
RS Stock No. 729-5564
Mfr. Part No.EC11B15242AF
HK$55.51
Each
units
15 Flat 6 mm Incremental Digital Square Wave Through Hole 20mm Not Indexed - 1 mm, 2.1 x 1.8 mm -
RS Stock No. 623-4237
Mfr. Part No.EC12E2424407
HK$13.13
Each
units
24 Flat - - - Through Hole 14mm Not Indexed - - -
RS Stock No. 172-8098
Mfr. Part No.EC12E2424407
HK$16.303
Each (In a Tray of 120)
units
24 Flat - - - Through Hole 14mm Not Indexed - - -
RS Stock No. 172-7669
Mfr. Part No.EC11E15244G1
HK$20.19
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. 172-7664
Mfr. Part No.EC11E15204A3
HK$19.00
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. 729-5589
Mfr. Part No.EC11E15244G1
HK$26.42
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. 729-5561
Mfr. Part No.EC11E15204A3
HK$22.33
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. 623-4136
Mfr. Part No.EC11B202440M
HK$49.70
Each
units
20 Flat - - - Through Hole 20mm Not Indexed - - -
RS Stock No. 172-6398
Mfr. Part No.EC11B15242AE
HK$29.54
Each (In a Tray of 70)
units
15 Flat 6 mm Incremental Digital Square Wave Through Hole 20mm Not Indexed - 1 mm, 2.1 x 1.8 mm -
RS Stock No. 729-5555
Mfr. Part No.EC11B15242AE
HK$60.12
Each
units
15 Flat 6 mm Incremental Digital Square Wave Through Hole 20mm Not Indexed - 1 mm, 2.1 x 1.8 mm -
RS Stock No. 623-4221
Mfr. Part No.EC12E2420404
HK$14.00
Each
units
24 Flat - - - Through Hole 15mm Not Indexed - - -
RS Stock No. 172-6281
Mfr. Part No.EC10E1220505
HK$3.80
Each (In a Bag of 400)
units
12 Hollow 3.6 mm Incremental Digital Square Wave Through Hole - Not Indexed - 1 mm, 2.1 x 1.8 mm -
RS Stock No. 265-1723
Mfr. Part No.EC16B2410408
HK$21.91
Each
units
24 Flat 6 mm Incremental - Through Hole 25mm - - 1.2 mm, 2 x 2.1 mm 0.5mA
RS Stock No. 729-5703
Mfr. Part No.EC11EBB24C03
HK$125.53
Each
units
15 Flat (Inner Shaft), Slot (Outer Shaft) 3.5 (Inner Shaft) mm, 6 (Outer Shaft) mm Incremental Digital Square Wave Through Hole 25mm Not Indexed - 1 mm, 2.6 x 1.5 mm -
RS Stock No. 172-8047
Mfr. Part No.EC12E2420404
HK$4.93
Each (In a Tray of 120)
units
24 Flat - - - Through Hole 15mm Not Indexed - - -
RS Stock No. 729-5527
Mfr. Part No.EC05E1220203
HK$14.90
Each
units
12 Hollow 2 mm Incremental - Bracket Mount, Surface Mount - Not Indexed - 1.5mm -
RS Stock No. 729-5545
Mfr. Part No.EC10E1220505
HK$4.62
Each
units
12 Hollow 3.6 mm Incremental Digital Square Wave Through Hole - Not Indexed - 1 mm, 2.1 x 1.8 mm -
RS Stock No. 729-5895
Mfr. Part No.SRGAV80601
HK$35.40
Each
units
8 (Positions) Hollow 5 mm Absolute Gray Code Through Hole - Not Indexed - 0.9 mm, 1.5 mm, 1.55 mm -