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. 729-5909
Mfr. Part No.SRGP200200
SGD4.13
Each
units
10 Hollow - Incremental Digital Square Wave Through Hole - Not Indexed - 1 mm, 1.5 mm, 2.05 mm, 2.1 mm -
RS Stock No. 172-8098
Mfr. Part No.EC12E2424407
SGD1.98
Each (In a Tray of 120)
units
24 Flat - - - Through Hole 14mm Not Indexed - - -
RS Stock No. 623-4237
Mfr. Part No.EC12E2424407
SGD2.37
Each
units
24 Flat - - - Through Hole 14mm Not Indexed - - -
RS Stock No. 714-2693
Mfr. Part No.AEAT-6012-A06
BrandBroadcom
SGD42.72
Each
units
- Plain 6 mm Absolute - - 8.5mm - 12000rpm 0.13mm -
RS Stock No. 189-4750
Mfr. Part No.AEAT-6012-A06
BrandBroadcom
SGD30.478
Each (In a Tube of 280)
units
1024 (Positions) - 6 mm Absolute - Screw Mount 8.5mm - 12000rpm 17mm 20mA
RS Stock No. 172-6320
Mfr. Part No.EC16B242040R
SGD1.797
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
SGD5.03
Each
units
24 Flat 6 mm Incremental - Through Hole 25mm - - 1.2 mm, 2 x 2.1 mm -
RS Stock No. 623-4221
Mfr. Part No.EC12E2420404
SGD2.02
Each
units
24 Flat - - - Through Hole 15mm Not Indexed - - -
RS Stock No. 172-8047
Mfr. Part No.EC12E2420404
SGD1.872
Each (In a Tray of 120)
units
24 Flat - - - Through Hole 15mm Not Indexed - - -
RS Stock No. 729-5527
Mfr. Part No.EC05E1220203
SGD3.88
Each
units
12 Hollow 2 mm Incremental - Bracket Mount, Surface Mount - Not Indexed - 1.5mm -
RS Stock No. 167-4659
Mfr. Part No.PEC11R-4220F-S0024
BrandBourns
SGD1.756
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. 737-7742
Mfr. Part No.PEC11R-4215K-S0024
BrandBourns
SGD2.32
Each
units
24 Knurl 6 mm Incremental Digital Square Wave Through Hole 15mm Not Indexed 60rpm 2.6 x 1.8 mm, 1 mm -
RS Stock No. 167-4651
Mfr. Part No.PEC11R-4215K-S0024
BrandBourns
SGD1.756
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. 737-7767
Mfr. Part No.PEC11R-4220F-S0024
BrandBourns
SGD2.28
Each
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. 178-2944
Mfr. Part No.AEAT-6010-A06
BrandBroadcom
SGD27.44
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
SGD35.96
Each
units
- Plain 6 mm Absolute - Screw Mount 8.5mm Not Indexed 12000rpm 0.13mm -
RS Stock No. 623-4079
Mfr. Part No.EC11B15244A7
SGD6.97
Each
units
15 Flat - - - Through Hole 20mm Not Indexed - - -
RS Stock No. 172-7596
Mfr. Part No.EC12E24204A8
SGD1.539
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. 623-4186
Mfr. Part No.EC12E1220401
SGD2.00
Each
units
12 Flat - - - Through Hole 20mm Not Indexed - - -
RS Stock No. 729-5918
Mfr. Part No.SRGP300100
SGD4.25
Each
units
9 Hollow 7.6 mm Incremental Digital Square Wave Surface Mount - Not Indexed - 1.6mm -