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. 714-0234
Mfr. Part No.AEAT-6010-A06
BrandBroadcom
TWD896.00
Each
units
- Plain 6 mm Absolute - Screw Mount 8.5mm Not Indexed 12000rpm 0.13mm -
RS Stock No. 178-2944
Mfr. Part No.AEAT-6010-A06
BrandBroadcom
TWD695.40
Each (In a Tray of 280)
units
- Plain 6 mm Absolute - Screw Mount 8.5mm Not Indexed 12000rpm 0.13mm -
RS Stock No. 167-4653
Mfr. Part No.PEC11R-4215F-S0024
BrandBourns
TWD44.30
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. 737-7748
Mfr. Part No.PEC11R-4215F-S0024
BrandBourns
TWD57.00
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. 623-4120
Mfr. Part No.EC11B2024201
TWD138.00
Each
units
20 Flat - - - Through Hole 20mm Not Indexed - - -
RS Stock No. 172-7691
Mfr. Part No.EC11B2024201
TWD124.40
Each (In a Tray of 70)
units
20 Flat - - - Through Hole 20mm Not Indexed - - -
RS Stock No. 789-9523
Mfr. Part No.PEC11R-4115K-S0018
BrandBourns
TWD67.00
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. 167-5390
Mfr. Part No.PEC11R-4115K-S0018
BrandBourns
TWD50.60
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. 172-7678
Mfr. Part No.EC11K1525401
TWD145.00
Each (In a Tray of 100)
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. 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
TWD32.80
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. 172-8134
Mfr. Part No.EC11B15242AF
TWD120.80
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. 729-5545
Mfr. Part No.EC10E1220505
TWD30.00
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. 172-8083
Mfr. Part No.EC05E1220401
TWD48.50
Each (On a Reel of 2000)
units
12 Hollow 2.2 mm Incremental - Bracket Mount, Surface Mount - Not Indexed - 0.62mm -
RS Stock No. 729-5564
Mfr. Part No.EC11B15242AF
TWD219.00
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. 729-5536
Mfr. Part No.EC05E1220401
TWD100.00
Each
units
12 Hollow 2.2 mm Incremental - Bracket Mount, Surface Mount - Not Indexed - 0.62mm -
RS Stock No. 623-4136
Mfr. Part No.EC11B202440M
TWD191.00
Each
units
20 Flat - - - Through Hole 20mm Not Indexed - - -
RS Stock No. 172-6281
Mfr. Part No.EC10E1220505
TWD21.00
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
TWD42.00
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. 729-5577
Mfr. Part No.EC11E1830401
TWD317.00
Each
units
18 Flat 6 mm Incremental Digital Square Wave Through Hole 20mm Not Indexed - 1 mm, 2.6 x 1.5 mm -