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. 178-2944
Mfr. Part No.AEAT-6010-A06
BrandBroadcom
HK$164.199
Each (In a Tray of 280)
units
- Plain 6 mm Absolute - Screw Mount 8.5mm Not Indexed 12000rpm 0.13mm -
RS Stock No. 737-7739
Mfr. Part No.PEC11R-4015F-S0024
BrandBourns
HK$14.22
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. 729-5637
Mfr. Part No.EC11K1525401
HK$31.59
Each
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. 663-3170
Mfr. Part No.DPL12V2424A24KR
HK$55.09
Each
units
24 Knurl 6 mm Incremental Digital Square Wave Through Hole 24mm Not Indexed 60rpm 1.1mm -
RS Stock No. 789-9490
Mfr. Part No.EMS22A50-D28-LT6
BrandBourns
HK$402.86
Each
units
1024 (Position) Plain 3.17 mm Absolute Digital Square Wave Through Hole 22.23mm Not Indexed 10000rpm 10.67mm -
RS Stock No. 172-6433
Mfr. Part No.EM11B16140A4
HK$147.80
Each (In a Tray of 100)
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. 623-4142
Mfr. Part No.EC11B2020201
HK$36.49
Each
units
20 Flat - - - Through Hole 20mm Not Indexed - - -
RS Stock No. 172-8112
Mfr. Part No.EC11E18244AU
HK$27.675
Each (In a Tray of 120)
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. 714-0234
Mfr. Part No.AEAT-6010-A06
BrandBroadcom
HK$215.18
Each
units
- Plain 6 mm Absolute - Screw Mount 8.5mm Not Indexed 12000rpm 0.13mm -
RS Stock No. 789-9517
Mfr. Part No.PEC11R-4020F-N0024
BrandBourns
HK$14.09
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. 265-1739
Mfr. Part No.EC16B242040R
HK$28.71
Each
units
24 Flat 6 mm Incremental - Through Hole 25mm - - 1.2 mm, 2 x 2.1 mm -
RS Stock No. 167-5389
Mfr. Part No.PEC11R-4020F-N0024
BrandBourns
HK$10.868
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. 172-6303
Mfr. Part No.EC12E1220401
HK$7.41
Each (In a Tray of 120)
units
12 Flat - - - Through Hole 20mm Not Indexed - - -
RS Stock No. 167-4660
Mfr. Part No.PEC12R-4220F-S0024
BrandBourns
HK$8.04
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. 172-7670
Mfr. Part No.EC11E183440C
HK$27.675
Each (In a Tray of 120)
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. 167-4650
Mfr. Part No.PEC11R-4015F-S0024
BrandBourns
HK$10.87
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. 789-9513
Mfr. Part No.PEC11R-4020F-N0012
BrandBourns
HK$14.30
Each
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. 172-6320
Mfr. Part No.EC16B242040R
HK$10.825
Each (In a Tray of 60)
units
24 Flat 6 mm Incremental - Through Hole 25mm - - 1.2 mm, 2 x 2.1 mm -
RS Stock No. 172-8120
Mfr. Part No.EC11E1834403
HK$30.194
Each (In a Tray of 120)
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. 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 -
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