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. 623-4293
Mfr. Part No.EC11E15244C0
HK$71.00
Each
units
15 Flat 6 mm Incremental Digital Square Wave Through Hole 20mm - - 1 mm, 2.6 x 1.5 mm -
RS Stock No. 729-5895
Mfr. Part No.SRGAV80601
HK$36.11
Each
units
8 (Positions) Hollow 5 mm Absolute Gray Code Through Hole - Not Indexed - 0.9 mm, 1.5 mm, 1.55 mm -
RS Stock No. 729-5703
Mfr. Part No.EC11EBB24C03
HK$155.48
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. 737-7767
Mfr. Part No.PEC11R-4220F-S0024
BrandBourns
HK$14.22
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. 172-7688
Mfr. Part No.SRGAV80601
HK$26.32
Each (In a Tray of 84)
units
8 (Positions) Hollow 5 mm Absolute Gray Code Through Hole - Not Indexed - 0.9 mm, 1.5 mm, 1.55 mm -
RS Stock No. 172-6422
Mfr. Part No.EC11EBB24C03
HK$127.214
Each (In a Tray of 70)
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. 172-6354
Mfr. Part No.EC05E1220203
HK$13.45
Each (On a Reel of 1000)
units
12 Hollow 2 mm Incremental - Bracket Mount, Surface Mount - Not Indexed - 1.5mm -
RS Stock No. 172-6400
Mfr. Part No.EC11E15244C0
HK$50.69
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. 167-4659
Mfr. Part No.PEC11R-4220F-S0024
BrandBourns
HK$10.87
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. 172-8047
Mfr. Part No.EC12E2420404
HK$10.68
Each (In a Tray of 120)
units
24 Flat - - - Through Hole 15mm Not Indexed - - -
RS Stock No. 729-5606
Mfr. Part No.EC11E18244A5
HK$26.78
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. 167-3625
Mfr. Part No.EAW0J-B24-AE0128L
BrandBourns
HK$56.768
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. 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. 729-5583
Mfr. Part No.EC11E153440D
HK$28.24
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. 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. 623-4287
Mfr. Part No.EM11B16140A4
HK$224.91
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. 167-4656
Mfr. Part No.PEC11R-4220F-S0012
BrandBourns
HK$10.87
Each (In a Bag of 75)
units
12 Flat 6 mm Incremental Digital Square Wave - 20mm Not Indexed 60rpm 7mm -
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. 172-8121
Mfr. Part No.EC11E18244A5
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. 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 -
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