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. 623-4237
Mfr. Part No.EC12E2424407
PHP90.85
Each
units
24 Flat - - - Through Hole 14mm Not Indexed - - -
RS Stock No. 663-3158
Mfr. Part No.DPL12VN24A24KR
PHP326.19
Each
units
24 Knurl 6 mm Incremental Digital Square Wave Through Hole 24mm Not Indexed 60rpm 1.1mm -
RS Stock No. 729-5817
Mfr. Part No.EC12E24404A8
PHP50.49
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. 789-9618
Mfr. Part No.PEC12R-2230F-S0024
BrandBourns
PHP52.50
Each
units
24 Flat 6 mm Incremental Digital Square Wave Through Hole 19mm Not Indexed 100rpm 1 mm, 2 x 2.1 mm -
RS Stock No. 729-5722
Mfr. Part No.EC11J1524413
PHP211.20
Each
units
15 Flat 5.975 mm Incremental Digital Square Wave Surface Mount 20mm Not Indexed - 2.1 mm, 1.6 x 1.9 mm -
RS Stock No. 172-6332
Mfr. Part No.EC12D1564404
PHP46.62
Each (In a Tray of 80)
units
15 Flat 5.975 mm Incremental Digital Square Wave Through Hole 17.5mm Not Indexed - 1.05 mm, 2.1 mm, 2.15 x 2.05 mm -
RS Stock No. 172-6413
Mfr. Part No.EC20A1824401
PHP402.05
Each (In a Tray of 40)
units
18 Flat 6 mm Incremental Digital Square Wave Through Hole 30mm Not Indexed - 1.2 mm, 2.6 x 1.5 mm -
RS Stock No. 172-6389
Mfr. Part No.EC11J0925403
PHP190.58
Each (In a Tray of 30)
units
9 Flat 5.975 mm Incremental Digital Square Wave Surface Mount 20mm Not Indexed - 2.1 mm, 1.3 x 1.8 mm -
RS Stock No. 729-5684
Mfr. Part No.EC1110120201
PHP680.68
Each
units
- Flat 6 mm Incremental Digital Square Wave Through Hole 20mm Not Indexed - 1 mm, 2.6 x 1.5 mm -
RS Stock No. 729-5895
Mfr. Part No.SRGAV80601
PHP278.96
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. 167-4649
Mfr. Part No.PEC11R-4115F-S0018
BrandBourns
PHP66.68
Each (In a Bag of 75)
units
18 Flat 6 mm Incremental Digital Square Wave Through Hole 15mm Not Indexed 60rpm 1 mm, 2.6 x 1.8 mm -
RS Stock No. 172-6354
Mfr. Part No.EC05E1220203
PHP86.679
Each (On a Reel of 1000)
units
12 Hollow 2 mm Incremental - Bracket Mount, Surface Mount - Not Indexed - 1.5mm -
RS Stock No. 729-5860
Mfr. Part No.EC12D1564404
PHP54.60
Each
units
15 Flat 5.975 mm Incremental Digital Square Wave Through Hole 17.5mm Not Indexed - 2.15 x 2.05 mm, 1.05 mm, 2.1 mm -
RS Stock No. 663-3182
Mfr. Part No.DPL12V2424A24KG
PHP213.79
Each
units
24 Knurl 6 mm Incremental Digital Square Wave Through Hole 24mm Not Indexed 60rpm 1.1mm -
RS Stock No. 729-5536
Mfr. Part No.EC05E1220401
PHP89.97
Each
units
12 Hollow 2.2 mm Incremental - Bracket Mount, Surface Mount - Not Indexed - 0.62mm -
RS Stock No. 167-5090
Mfr. Part No.PEC12R-4020F-S0012
BrandBourns
PHP44.36
Each (In a Bag of 75)
units
12 Flat 6 mm Incremental Digital Square Wave Through Hole 20mm Not Indexed 100rpm 1 mm, 2 x 2.1 mm -
RS Stock No. 737-7745
Mfr. Part No.PEC11R-4125F-S0018
BrandBourns
PHP97.66
Each
units
18 Flat 6 mm Incremental Digital Square Wave - 25mm Not Indexed 60rpm 7mm -
RS Stock No. 172-6422
Mfr. Part No.EC11EBB24C03
PHP655.20
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. 172-6386
Mfr. Part No.EC11K0925401
PHP168.32
Each (In a Tray of 100)
units
9 Flat 5.975 mm Incremental Digital Square Wave Through Hole 20mm Not Indexed - 1.05 mm, 2.1 mm, 1.6 x 1.9 mm, 2.65 x 1.55 mm -
RS Stock No. 168-0828
Mfr. Part No.DPL12VN24A24KG
PHP197.40
Each (In a Box of 1000)
units
24 Knurl 6 mm Incremental Digital Square Wave Through Hole 24mm Not Indexed 60rpm 1.1mm -
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