Controlled soft closing
WW20J4S
Rotary Damper WW20J4S
Zinc-alloy shaft rotary damper for controlled lid movement.
Special torque customization available- Reference dimensions
- Ø21.5 mm max profile / 37 mm overall length
- Published torque
- 1.0–4.0 N·m

Product data
Specifications
These values are published from the current Uniwise product data. Final movement and fit should be confirmed with the actual mechanism and sample testing.
- Torque
- 1.0–4.0 N·m
- Rotation
- CW / CCW variants
- Operating angle
- Opening 115° / closing -5°
- Dimensions
- Ø21.5 mm max profile / 37 mm overall length
- Shaft / mechanism
- zinc alloy
- Material
- Shaft: zinc alloy; housing: PBT+GF
- Application
- Toilet seat / appliance / custom lid
- MOQ
- Contact us
- Customization
- Special torque customization available
Reference dimensions
These values are transcribed from the technical drawing stored with this product. Use them to screen mechanical fit, then verify the full drawing before tooling or mass production.
Maximum body profile: Ø21.5 mm
Overall length: 37 mm
Length stack: 3 + 22 + 12 mm
Input profiles: Ø20 / Ø15.5 mm
Output profile: 11.8 × 7.9 mm
Slot width: 4.8 mm
Samples, order quantities & supply information
Application support
Confirm this model for your application.
Send the model number and installation details. We will review the fit and supply options.




