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. 178-2944
Mfr. Part No.AEAT-6010-A06
BrandBroadcom
TWD664.10
Each (In a Tray of 280)
units
- Plain 6 mm Absolute - Screw Mount 8.5mm Not Indexed 12000rpm 0.13mm -
RS Stock No. 714-0234
Mfr. Part No.AEAT-6010-A06
BrandBroadcom
TWD870.00
Each
units
- Plain 6 mm Absolute - Screw Mount 8.5mm Not Indexed 12000rpm 0.13mm -
RS Stock No. 737-7748
Mfr. Part No.PEC11R-4215F-S0024
BrandBourns
TWD50.00
Each
units
24 Flat 6 mm Incremental Digital Square Wave Through Hole 15mm Not Indexed 60rpm 1 mm, 2.6 x 1.8 mm -
RS Stock No. 167-4653
Mfr. Part No.PEC11R-4215F-S0024
BrandBourns
TWD40.40
Each (In a Bag of 75)
units
24 Flat 6 mm Incremental Digital Square Wave Through Hole 15mm Not Indexed 60rpm 1 mm, 2.6 x 1.8 mm -
RS Stock No. 172-7691
Mfr. Part No.EC11B2024201
TWD122.10
Each (In a Tray of 70)
units
20 Flat - - - Through Hole 20mm Not Indexed - - -
RS Stock No. 623-4120
Mfr. Part No.EC11B2024201
TWD162.00
Each
units
20 Flat - - - Through Hole 20mm Not Indexed - - -
RS Stock No. 167-5390
Mfr. Part No.PEC11R-4115K-S0018
BrandBourns
TWD49.20
Each (In a Bag of 75)
units
18 Knurl 6 mm Incremental Digital Square Wave Through Hole 15mm Not Indexed 60rpm 1 mm, 2.6 x 1.8 mm -
RS Stock No. 789-9523
Mfr. Part No.PEC11R-4115K-S0018
BrandBourns
TWD64.00
Each
units
18 Knurl 6 mm Incremental Digital Square Wave Through Hole 15mm Not Indexed 60rpm 1 mm, 2.6 x 1.8 mm -
RS Stock No. 729-5637
Mfr. Part No.EC11K1525401
TWD153.00
Each
units
15 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 -
RS Stock No. 167-5399
Mfr. Part No.PEC12R-4025F-S0024
BrandBourns
TWD31.40
Each (In a Bag of 75)
units
24 Flat 6 mm Incremental Digital Square Wave Through Hole 25mm Not Indexed 100rpm 1 mm, 2 x 2.1 mm -
RS Stock No. 623-4136
Mfr. Part No.EC11B202440M
TWD213.00
Each
units
20 Flat - - - Through Hole 20mm Not Indexed - - -
RS Stock No. 172-6281
Mfr. Part No.EC10E1220505
TWD20.40
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. 789-9649
Mfr. Part No.PEC12R-4025F-S0024
BrandBourns
TWD45.00
Each
units
24 Flat 6 mm Incremental Digital Square Wave Through Hole 25mm Not Indexed 100rpm 1 mm, 2 x 2.1 mm -
RS Stock No. 172-8134
Mfr. Part No.EC11B15242AF
TWD167.90
Each (In a Tray of 70)
units
15 Flat 6 mm Incremental Digital Square Wave Through Hole 20mm Not Indexed - 1 mm, 2.1 x 1.8 mm -
RS Stock No. 729-5536
Mfr. Part No.EC05E1220401
TWD105.00
Each
units
12 Hollow 2.2 mm Incremental - Bracket Mount, Surface Mount - Not Indexed - 0.62mm -
RS Stock No. 729-5564
Mfr. Part No.EC11B15242AF
TWD169.00
Each
units
15 Flat 6 mm Incremental Digital Square Wave Through Hole 20mm Not Indexed - 1 mm, 2.1 x 1.8 mm -
RS Stock No. 729-5545
Mfr. Part No.EC10E1220505
TWD29.00
Each
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. 167-5310
Mfr. Part No.PEC12R-4225F-S0024
BrandBourns
TWD30.50
Each (In a Bag of 75)
units
24 Flat 6 mm Incremental Digital Square Wave Through Hole 25mm - 100rpm 1mm -
RS Stock No. 781-6830
Mfr. Part No.PEC11R-4220K-S0024
BrandBourns
TWD49.00
Each
units
24 Knurl 6 mm Incremental Digital Square Wave Through Hole 20mm - 60rpm 1mm -
RS Stock No. 167-5382
Mfr. Part No.PEC11R-4215F-S0012
BrandBourns
TWD42.10
Each (In a Bag of 75)
units
12 Flat 6 mm Incremental Digital Square Wave Through Hole 15mm - 60rpm 1mm -