Hollow-Shaft Encoders

Dynapar offers both incremental and absolute hollow-shaft encoders in a variety of sizes and resolutions. Hollow-shaft encoders can be directly mounted to a motor shaft and affixed using a flexible tether or torque arm to prevent the encoder from rotating. Hollow-shaft encoders are easier to install than shafted encoders, eliminating the need for a coupling and do not require motor shaft alignment with respect to the encoder.

Learn more about hollow shaft encoder mounting here

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Featured Hollow-Shaft Encoders

HS35R

Heavy duty incremental hollow-shaft encoder rated at 400G shock, 20G vibration. Wide temperature range and IP67 option. 1-5,000 PPR.

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HS20

Compact 2.0" size incremental hollow-shaft encoder with electrically isolated shaft design. ABZ and differential output options. 1-2,540 PPR.

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F10

Ultra small size 10 hollow-shaft incremental encoder with up to 120°C temperature range. Max 2,048 PPR with commutation tracks available.

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HS56

Hollow-shaft magnetic encoder. 1-1/8" max bore size. Mounts to motors without C-Face mounts. Single or dual isolated output options. Up to 2,048 PPR...

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AD36

Compact size 15 or 38mm diameter hollow shaft absolute encoder. SSI, BiSS, SSI Gray options. Up to 22 bit ST and 12 bit MT resolution.

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Featured Accessories

Tethers and Cover Kits

See tether and cover kits including single point, slotted and rod tethers as well as basket covers that attach over the encoder to motor face.

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Encoder Cables

Find mating cables, cable assemblies with connectors, raw cable and shielded cables in a variety of lengths and output types.

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Frequently Asked Questions about Hollow=Shaft Encoders

What is a hollow-shaft encoder?

A hollow-shaft encoder is designed for the motor shaft to pass through the housing of the encoder. This design saves space by eliminating the need for a coupler and allows for a simple mounting.

Learn more about hollow-shaft encoders here

What is a shaft encoder used for?

A shaft encoder is used for applications that require the encoder to be isolated from motor noise and/ or mechanical vibration. A shaft encoder uses a mechanical coupling to attach the encoder shaft to a motor shaft and typically takes up more space than other mounting styles.

How do you mount a hollow-shaft encoder?

To mount a hollow shaft encoder you will want to follow a few simple steps. Begin by checking and cleaning your mating shaft. Next, install the tether on your encoder. Slide the encoder on the motor shaft. Secure the tether to the mounting face. Finally, tighten encoder clamp to mating shaft.

Download a free white paper on encoder mounting techniques here

What is a thru-bore encoder?

A thru-shaft or thru-bore encoder are alternative names for hollow shaft encoders. As the name implies, the thru-bore encoder housing design has a complete bore opening allowing the motor shaft to mount through the middle of the encoder. Unlike a blind-hollowshaft or hubshaft encoder, you will be able to visually see through a thru-bore encoder.

Hollow-Shaft Encoders

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Step 1: Select Feedback Type (Learn How to Choose)

Absolute Encoders

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Hollow Shaft

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Shafted

Step 2: Select Mounting Style (Learn How)

Hollow Shaft

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Shafted

Bearingless