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. 789-9582
Mfr. Part No.PEC11S-929K-N0015
BrandBourns
PHP106.40
Each
units
15 Knurl 6 mm Incremental Digital Square Wave Surface Mount 9mm Not Indexed 60rpm 2.5mm -
RS Stock No. 172-6281
Mfr. Part No.EC10E1220505
PHP23.31
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. 172-7599
Mfr. Part No.EC12E24202A2
PHP45.427
Each (In a Tray of 110)
units
24 Flat - - - Through Hole 15mm Not Indexed - - -
RS Stock No. 623-4221
Mfr. Part No.EC12E2420404
PHP42.34
Each
units
24 Flat - - - Through Hole 15mm Not Indexed - - -
RS Stock No. 729-5854
Mfr. Part No.EC12D1524403
PHP49.35
Each
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. 167-4656
Mfr. Part No.PEC11R-4220F-S0012
BrandBourns
PHP66.68
Each (In a Bag of 75)
units
12 Flat 6 mm Incremental Digital Square Wave - 20mm Not Indexed 60rpm 7mm -
RS Stock No. 167-4651
Mfr. Part No.PEC11R-4215K-S0024
BrandBourns
PHP66.68
Each (In a Bag of 75)
units
24 Knurl 6 mm Incremental Digital Square Wave Through Hole 15mm Not Indexed 60rpm 1 mm, 2.6 x 1.8 mm -
RS Stock No. 729-5889
Mfr. Part No.EM20B4014000
PHP1,404.13
Each
units
40 Flat 4 mm Incremental Digital Square Wave Through Hole 16mm Not Indexed - 2.6 x 1.8 mm, 0.6 mm -
RS Stock No. 172-6320
Mfr. Part No.EC16B242040R
PHP66.367
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. 265-1739
Mfr. Part No.EC16B242040R
PHP115.25
Each
units
24 Flat 6 mm Incremental - Through Hole 25mm - - 1.2 mm, 2 x 2.1 mm -
RS Stock No. 729-5615
Mfr. Part No.EC11E1834403
PHP251.40
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. 737-7694
Mfr. Part No.EMS22D51-B28-LS5
BrandBourns
PHP1,816.29
Each
units
512 Plain 6.34 mm Incremental Digital Square Wave Bracket Mount 22.23mm Indexed 10000rpm - -
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. 172-8065
Mfr. Part No.EC12E2420801
PHP58.80
Each (In a Tray of 95)
units
24 Flat 6 mm Incremental Digital Square Wave Through Hole 25mm Not Indexed - 1 mm, 2.1 x 2 mm -
RS Stock No. 663-3215
Mfr. Part No.DPL12SV2424A25K1
PHP425.62
Each
units
24 Knurl 6.8 mm Incremental Digital Square Wave Through Hole 25mm Not Indexed 60rpm 1 mm, 1.1 mm -
RS Stock No. 167-5402
Mfr. Part No.PEC12R-4230F-N0024
BrandBourns
PHP31.13
Each (In a Bag of 75)
units
24 Flat 6 mm Incremental Digital Square Wave Through Hole 30mm Not Indexed 100rpm 1 mm, 2 x 2.1 mm -
RS Stock No. 623-4293
Mfr. Part No.EC11E15244C0
PHP208.63
Each
units
15 Flat 6 mm Incremental Digital Square Wave Through Hole 20mm - - 2.6 x 1.5 mm, 1 mm -
RS Stock No. 663-3233
Mfr. Part No.DPL12SV2424A21F3
PHP271.96
Each
units
24 Flat 6.8 mm Incremental Digital Square Wave Through Hole 21mm Not Indexed 60rpm 1 mm, 1.1 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. 729-5606
Mfr. Part No.EC11E18244A5
PHP164.26
Each
units
18 Flat 6 mm Incremental Digital Square Wave Through Hole 20mm Not Indexed - 2.6 x 1.5 mm, 1 mm -
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