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. 663-3182
Mfr. Part No.DPL12V2424A24KG
TWD166.00
Each
units
24 Knurl 6 mm Incremental Digital Square Wave Through Hole 24mm Not Indexed 60rpm 1.1mm -
RS Stock No. 729-5836
Mfr. Part No.EC12E2420801
TWD70.00
Each
units
24 Flat 6 mm Incremental Digital Square Wave Through Hole 25mm Not Indexed - 1 mm, 2.1 x 2 mm -
RS Stock No. 729-5927
Mfr. Part No.SRGPWJ0500
TWD158.00
Each
units
16 Hollow 18.5 mm Incremental Digital Square Wave Through Hole - Not Indexed - 1 mm, 2.5 x 1.6 mm, 2.55 mm -
RS Stock No. 729-5703
Mfr. Part No.EC11EBB24C03
TWD629.00
Each
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. 729-5867
Mfr. Part No.EC12D1524406
TWD61.00
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. 172-6400
Mfr. Part No.EC11E15244C0
TWD175.40
Each (In a Tray of 120)
units
15 Flat 6 mm Incremental Digital Square Wave Through Hole 20mm - - 1 mm, 2.6 x 1.5 mm -
RS Stock No. 789-9591
Mfr. Part No.PEC12R-2120F-S0012
BrandBourns
TWD40.00
Each
units
12 Flat 6 mm Incremental Digital Square Wave Through Hole 9mm Not Indexed 100rpm 1 mm, 2 x 2.1 mm -
RS Stock No. 623-4221
Mfr. Part No.EC12E2420404
TWD45.00
Each
units
24 Flat - - - Through Hole 15mm Not Indexed - - -
RS Stock No. 729-5817
Mfr. Part No.EC12E24404A8
TWD56.00
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. 729-5851
Mfr. Part No.EC12E2460802
TWD76.00
Each
units
24 Flat 6 mm Incremental Digital Square Wave Through Hole 30mm Not Indexed - 1 mm, 2.1 x 2 mm -
RS Stock No. 729-5895
Mfr. Part No.SRGAV80601
TWD155.00
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. 663-3230
Mfr. Part No.DPL12SV2424A25K3
TWD277.00
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. 172-6318
Mfr. Part No.EC12E1220813
TWD56.60
Each (In a Tray of 95)
units
12 Flat 6 mm Incremental Digital Square Wave Through Hole 25mm Not Indexed - 1 mm, 2.1 x 2 mm -
RS Stock No. 263-2918
Mfr. Part No.EAW0J-B24-AE0128L
BrandBourns
TWD253.00
Each
units
128 Plain with Slot 6.35 mm Absolute Digital Bracket Mount 19.05mm Not Indexed 120rpm 9mm -
RS Stock No. 265-2906
Mfr. Part No.EC11B1520206
TWD181.00
Each
units
15 Slot - Incremental Digital Square Wave Through Hole 25mm - - 1 mm, 2.1 x 1.8 mm -
RS Stock No. 167-5389
Mfr. Part No.PEC11R-4020F-N0024
BrandBourns
TWD42.60
Each (In a Bag of 75)
units
24 Flat 6 mm Incremental Digital Square Wave Through Hole 20mm Not Indexed 60rpm 1 mm, 2.6 x 1.8 mm -
RS Stock No. 729-5918
Mfr. Part No.SRGP300100
TWD86.00
Each
units
9 Hollow 7.6 mm Incremental Digital Square Wave Surface Mount - Not Indexed - 1.6mm -
RS Stock No. 789-9618
Mfr. Part No.PEC12R-2230F-S0024
BrandBourns
TWD40.00
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. 172-8042
Mfr. Part No.EC12E24204A9
TWD37.30
Each (In a Tray of 120)
units
24 Flat 6 mm Incremental Digital Square Wave Through Hole 25mm Not Indexed - 1 mm, 2.1 x 2 mm -
RS Stock No. 167-4652
Mfr. Part No.PEC11R-4125F-S0018
BrandBourns
TWD49.20
Each (In a Bag of 75)
units
18 Flat 6 mm Incremental Digital Square Wave - 25mm Not Indexed 60rpm 7mm -