Kübler Sendix 5020 Hollow Shaft Encoder

Name: Kübler Sendix 5020 Hollow Shaft Encoder – Datasheet & Quote
Brand: Kübler
SKU: Sendix 5020

An incremental hollow-shaft encoder with an undetachable clamping ring

The Kübler Sendix 5020 is the hollow-shaft version of the Sendix 5000 incremental encoder. It slides over the drive shaft, is clamped with a slotted clamping ring that cannot be lost during installation, and is held against rotation by a spring element, torque stop or stator coupling. This removes the coupling and the alignment work needed for a solid-shaft encoder.

The pulse rate goes up to 5000 pulses per revolution, the outputs are RS422, push-pull or open collector, protection reaches IP66/IP67 with a shaft seal, and the working temperature range is -40 to +85 C. The datasheet also lists a tangential cable outlet and a variant with a short cable and M12 connector for central fastening.

Technical specifications

Parameter	Specification
Type	Sendix 5020, hollow-shaft version (order code 8.5020.xxxx.xxxx)
Principle	Incremental, optical sensor
Pulse rate	1 to 5000 pulses per revolution
Through hollow shaft	6, 8, 10, 12, 14 and 15 mm; 1/4, 3/8, 1/2 and 5/8 inch
Maximum speed	IP65: 12000 min-1, 6000 min-1 continuous; IP66/IP67: 6000 min-1, 3000 min-1 continuous (family table)
Moment of inertia	Approx. 6 x 10-6 kgm2
Starting torque (20 C)	IP65 below 0.01 Nm; IP66/IP67 below 0.05 Nm
Protection (EN 60529)	IP65 without shaft seal; IP66/IP67 with shaft seal
Working temperature	-40 to +85 C with connector; cable fixed -30 C, cable moved -20 C
Output circuits	RS422 (5 V or 5 to 30 V), push-pull (HTL/TTL universal and 7272 compatible), open collector; max. 300 kHz
Weight	Approx. 0.4 kg (value printed for the family)
Approvals as printed	UL (file E224618), CE (EMC 2014/30/EU, RoHS 2011/65/EU), ATEX 2014/34/EU for Ex 2/22 variants (IP66/IP67 only, not for tangential or fitted-connector cables)

Order code 8.5020 and fixing options

The type key is 8.5020.a b c d.e. Choose the flange and shaft diameter to match the motor and the available mounting space.

Position	Options
a Flange	1 spring element long IP66/67, 2 IP65; 3 torque stop long IP66/67, 4 IP65; 7 stator coupling 65 mm IP66/67, 8 IP65; C stator coupling 63 mm IP66/67, D IP65; 5 and 6 stator coupling 57.2 mm (US version)
b Hollow shaft	1 = 6 mm; 9 = 8 mm; 3 = 10 mm; 5 = 12 mm; A = 14 mm; 8 = 15 mm; 2 = 1/4 inch; 4 = 3/8 inch; 6 = 1/2 inch; 7 = 5/8 inch
c Output / supply	4 RS422 5 V; 1 RS422 5-30 V; 2 push-pull 7272 5-30 V; 5 push-pull 10-30 V; 3 open collector; 8 push-pull without capacitor (US version)
d Connection	1/A radial cable, E/F tangential cable, R radial M12 5-pin, 2 radial M12 8-pin, 4 radial M23 12-pin, 6 and 7 radial MIL, H tangential cable 0.3 m with M12, L/M/N tangential cable with M12, M23 or Sub-D
e Pulse rate	Four digits, for example 1024 gives 8.5020.xxxx.1024; special cable length adds a length in decimetres

Installation and selection notes

Measure the motor shaft diameter and shaft end length first, because a through hollow shaft needs the shaft to pass the encoder while a blind version is only fitted at the shaft end. A 4 mm torque pin with fixing thread (8.0010.4700.0000) is listed as an accessory for the spring-element flange. Salt-spray-tested types such as 8.5020.18X2.XXXX-C are listed as standard versions for corrosive sites.

Pair the choice of output with the receiving input: push-pull suits PLC counters at 10 to 30 V, RS422 suits long cables and drives. For a solid-shaft version see the

Kübler Sendix 5000.

page, or browse encoders. Please confirm the pulse rate and cable length before ordering.

How the Kübler Sendix 5020 works

A disc with fine lines turns with the shaft, and an optical sensor reads the lines. The encoder sends out pulses, and a controller counts them to find the speed and the position. The hollow shaft slides over the motor shaft, so no coupling is needed.

Where the Sendix 5020 is used

Motor speed feedback
Drives and servo systems
Conveyor and roller lines
Winders and printing machines
Machine tools

Selection checklist for the Sendix 5020

Pulses per revolution
Hollow shaft diameter
Torque support type
Output circuit
Protection class
Cable or connector outlet
Maximum speed
Working temperature

Installation, commissioning and maintenance notes for the Sendix 5020

Slide the encoder onto the drive shaft and tighten the clamping ring. Fit the spring element, torque stop or stator coupling so the housing cannot turn. Wire the outputs and the supply. Check the pulse count with the controller. Inspect the cable for wear.

Requesting a quotation for the Kübler Sendix 5020

Please send the order code, the shaft diameter and the pulse rate. Seven Star LLC serves industrial customers in Oman and the GCC and replies with a quotation based on the information provided.

Sendix 5020 pulse rate

The pulse rate runs from 1 to 5000 pulses per revolution.

Sendix 5020 hollow shaft sizes

The shaft sizes are 6, 8, 10, 12, 14 and 15 mm, and 1/4, 3/8, 1/2 and 5/8 inch.

Sendix 5020 clamping ring

The slotted clamping ring cannot be lost during installation.

Sendix 5020 output circuits

The outputs are RS422, push-pull or open collector.

Sendix 5020 output frequency

The maximum output frequency is 300 kHz.

Sendix 5020 protection class

The protection is IP65, or IP66 and IP67 with a shaft seal.

Sendix 5020 temperature range

The working range is minus 40 to plus 85 degrees C with a connector.

Sendix 5020 maximum speed

The speed reaches 6000 min-1 on the IP66 and IP67 versions.

Sendix 5020 starting torque

The starting torque is below 0.01 Nm on the IP65 version.

Sendix 5020 weight

The weight is about 0.4 kg.

Encoder records for the Sendix 5020

Record the order code, the shaft size and the date of installation.

Choosing the right Sendix 5020 fixing

Choose the spring element, torque stop or stator coupling to match the motor flange and the space around it.

Sendix 5020 cable outlet

A tangential cable outlet is listed in the datasheet.

Sendix 5020 central fastening

A variant with a short cable and an M12 connector is offered for central fastening.

Sendix 5020 moment of inertia

The moment of inertia is about 6 x 10-6 kgm2.

Sendix 5020 order code

The order code has the form 8.5020.xxxx.xxxx.

Documents and quotation

The attached datasheet (05/2025 edition) is shared with the Sendix 5000 and contains both type keys, technical data, terminal assignments and dimension drawings for torque-stop, spring-element and stator-coupling flanges. Send the full type key, or the hollow-shaft diameter, flange, output circuit, connection, pulse rate and cable length, when requesting a quotation.

Rotary encoders for drives and machinery

The Sendix family covers incremental encoders such as the 5000 and 5020, optical and magnetic absolute encoders with SSI, BiSS or analog outputs, and explosion-protected versions with ATEX and IECEx approvals. One manufacturer can therefore serve drives, cranes, winches, packaging lines and hazardous-area machinery.

Counters, displays and connection technology

The company also lists pulse counters, tachometers, process displays, signal converters, cordsets and connectors that match its encoder range. Choosing the correct variant depends on the shaft or hollow-shaft size, flange, interface, resolution and protection class, and we check every order code against the manufacturer's datasheet before quoting.

Frequently Asked Questions