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. 172-6381
Mfr. Part No.SRGP400100
kr 14,151
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. 623-4237
Mfr. Part No.EC12E2424407
kr 13,76
Each
Units
24 Flat - - - Through Hole 14mm Not Indexed - - -
RS Stock No. 172-6320
Mfr. Part No.EC16B242040R
kr 11,632
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. 737-7694
Mfr. Part No.EMS22D51-B28-LS5
BrandBourns
kr 408,37
Each
Units
512 Plain 6.34 mm Incremental Digital Square Wave Bracket Mount 22.23mm Indexed 10000rpm - -
RS Stock No. 789-9526
Mfr. Part No.PEC11R-4020K-S0024
BrandBourns
kr 13,01
Each
Units
24 Knurl 6 mm Incremental Digital Square Wave Through Hole 20mm Not Indexed 60rpm 1 mm, 2.6 x 1.8 mm -
RS Stock No. 167-5393
Mfr. Part No.PEC11R-4215K-N0024
BrandBourns
kr 10,943
Each (In a Bag of 75)
Units
24 Knurl 6 mm Incremental Digital Square Wave Through Hole 15mm Indexed 60rpm 1 mm, 2.6 x 1.8 mm -
RS Stock No. 663-3158
Mfr. Part No.DPL12VN24A24KR
kr 40,48
Each
Units
24 Knurl 6 mm Incremental Digital Square Wave Through Hole 24mm Not Indexed 60rpm 1.1mm -
RS Stock No. 167-4659
Mfr. Part No.PEC11R-4220F-S0024
BrandBourns
kr 10,455
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. 265-1739
Mfr. Part No.EC16B242040R
kr 10,97
Each
Units
24 Flat 6 mm Incremental - Through Hole 25mm - - 1.2 mm, 2 x 2.1 mm -
RS Stock No. 167-5397
Mfr. Part No.PEC12R-4020F-S0024
BrandBourns
kr 8,825
Each (In a Bag of 75)
Units
24 Flat 6 mm Incremental Digital Square Wave Through Hole 20mm Not Indexed 100rpm 1 mm, 2 x 2.1 mm -
RS Stock No. 729-5895
Mfr. Part No.SRGAV80601
kr 16,03
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. 172-7688
Mfr. Part No.SRGAV80601
kr 15,874
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. 729-5911
Mfr. Part No.SRGP400100
kr 15,65
Each
Units
12 Hollow 9.23 mm Incremental Digital Square Wave Surface Mount - Not Indexed - 1.6mm -
RS Stock No. 789-9595
Mfr. Part No.PEC12R-2125F-N0012
BrandBourns
kr 8,08
Each
Units
12 Flat 6 mm Incremental Digital Square Wave Through Hole 15mm Not Indexed 100rpm 1 mm, 2 x 2.1 mm -
RS Stock No. 781-6809
Mfr. Part No.PEC12R-4230F-S0024
BrandBourns
kr 13,06
Each
Units
24 Flat 6 mm Incremental Digital Square Wave Through Hole 30mm - 100rpm 1mm -
RS Stock No. 729-5536
Mfr. Part No.EC05E1220401
kr 20,74
Each
Units
12 Hollow 2.2 mm Incremental - Bracket Mount, Surface Mount - Not Indexed - 0.62mm -
RS Stock No. 781-6811
Mfr. Part No.PEC12R-4225F-S0024
BrandBourns
kr 11,66
Each
Units
24 Flat 6 mm Incremental Digital Square Wave Through Hole 25mm - 100rpm 1mm -
RS Stock No. 167-4656
Mfr. Part No.PEC11R-4220F-S0012
BrandBourns
kr 10,357
Each (In a Bag of 75)
Units
12 Flat 6 mm Incremental Digital Square Wave - 20mm Not Indexed 60rpm 7mm -
RS Stock No. 729-5703
Mfr. Part No.EC11EBB24C03
kr 134,99
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. 172-6386
Mfr. Part No.EC11K0925401
kr 0,048
Each (In a Tray of 100)
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 -
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