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. 172-6377
Mfr. Part No.EC11B1520206
PHP157.171
Each (In a Tray of 70)
units
15 Slot - Incremental Digital Square Wave Through Hole 25mm - - 1 mm, 2.1 x 1.8 mm -
RS Stock No. 167-5397
Mfr. Part No.PEC12R-4020F-S0024
BrandBourns
PHP49.467
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. 172-7597
Mfr. Part No.EC12E24404A8
PHP40.58
Each (In a Tray of 120)
units
24 Flat 6 mm Incremental Digital Square Wave Through Hole 20mm Not Indexed - 1 mm, 2.1 x 2 mm -
RS Stock No. 623-4120
Mfr. Part No.EC11B2024201
PHP295.90
Each
units
20 Flat - - - Through Hole 20mm Not Indexed - - -
RS Stock No. 729-5624
Mfr. Part No.EC11K1524402
PHP196.91
Each
units
15 Flat 5.975 mm Incremental Digital Square Wave Through Hole 20mm Not Indexed - 1.6 x 1.9 mm, 2.65 x 1.55 mm, 1.05 mm, 2.1 mm -
RS Stock No. 729-5589
Mfr. Part No.EC11E15244G1
PHP165.57
Each
units
15 Flat 6 mm Incremental Digital Square Wave Through Hole 20mm Not Indexed - 2.6 x 1.5 mm, 1 mm -
RS Stock No. 690-6715
Mfr. Part No.26ASD22-01-1-AJS
BrandGrayhill
PHP1,048.95
Each
units
16 Flat 3.18 mm Incremental BCD Output - 15.88mm Not Indexed - 12.7mm 10 mA @ 5 V dc
RS Stock No. 789-9529
Mfr. Part No.PEC11R-4025F-N0024
BrandBourns
PHP69.85
Each
units
24 Flat 6 mm Incremental Digital Square Wave Through Hole 25mm Not Indexed 60rpm 1 mm, 2.6 x 1.8 mm -
RS Stock No. 729-5599
Mfr. Part No.EC11E09244AQ
PHP164.33
Each
units
9 Flat 6 mm Incremental Digital Square Wave Through Hole 20mm Not Indexed - 2.6 x 1.5 mm, 1 mm -
RS Stock No. 729-5662
Mfr. Part No.EC11K0925801
PHP216.25
Each
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. 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. 172-6390
Mfr. Part No.SRGPWJ0500
PHP120.00
Each (In a Tray of 200)
units
16 Hollow 18.5 mm Incremental Digital Square Wave Through Hole - Not Indexed - 1 mm, 2.55 mm, 2.5 x 1.6 mm -
RS Stock No. 729-5583
Mfr. Part No.EC11E153440D
PHP157.59
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. 663-3198
Mfr. Part No.DPL12V2424A20FB
PHP432.69
Each
units
24 Flat 6 mm Incremental Digital Square Wave Through Hole 20mm Not Indexed 60rpm 1.1mm -
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. 737-7736
Mfr. Part No.PEC11R-4115F-S0018
BrandBourns
PHP58.33
Each
units
18 Flat 6 mm Incremental Digital Square Wave Through Hole 15mm Not Indexed 60rpm 2.6 x 1.8 mm, 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. 623-4142
Mfr. Part No.EC11B2020201
PHP204.03
Each
units
20 Flat - - - Through Hole 20mm Not Indexed - - -
RS Stock No. 663-3170
Mfr. Part No.DPL12V2424A24KR
PHP450.38
Each
units
24 Knurl 6 mm Incremental Digital Square Wave Through Hole 24mm Not Indexed 60rpm 1.1mm -
RS Stock No. 169-1876
Mfr. Part No.RAME027R10712AB
BrandVishay
PHP22,633.00
1 Box of 1
Box(es)
- Plain 3 mm Absolute - Panel Mount 18.9mm Not Indexed - - 20mA
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