UNIKA 50 kN
Compact HDRM preload device for cleanrooms
Key features
50 kN preload capacity
High axial preload packed in a small modular body. Powered by high energy density of shape memory alloy.
Force-feedback control
Controlled SMA heating and an integrated load cell support accurate, repeatable tension with 99.9% accuracy.
Cleanroom-ready operation
No fluid, grease, or heavily loaded friction interfaces—suited to clean integration environments.
Works where access is limited
Tightening of the HDRM nuthe final nut through the device itself, without requiring side access.
UNIKA is a compact, lightweight preload device for Hold Down and Release Mechanisms on spacecraft. It delivers up to 50 kN of controlled preload in a cleanroom-ready, handheld format—built for solar-array tunnels, constrained integration zones, and other difficult-to-access locations.
Preload is generated electronically by controlled heating of a Shape Memory Alloy in a force-feedback loop using an integrated load cell. With no fluid, grease, or heavily loaded friction interfaces, UNIKA provides clean operation, data record, and dependable force control wherever precise HDRM tightening is needed. The development was presented at ESMATS 2025
UNIKA is supplied in a full set that contains:
Mechanical effector unit
Power source/control electronics
All necessary cables, charger
Reset docking station
Rugged transportation enclosure
User manual
Key details
MECHANICAL INTERFACE
User customized mating head
BOLT THREAD
User customized up to M10
GENERATED PRELOAD
Up to 50 kN @ max 3 mm of displacement
MASS
2 kg (without harness) + 2 kg power source
PRELOAD SETUP & CONTROL
Handheld display
FORCE READING & REGULATION
Built in load cell
SMA RESET
By supplied docking station withouit disassembly
LIFE OF THE SMA ELEMENT
> 300 guaranteed preloads
PRELOAD TIME
max. 5 min preload + 10 min cooldown *
PRELOAD ACCURACY
99% after 5 minutes, 99.9% after 8 minutes *
POWER SOURCE
120 Wh battery in rugged mobile enclosure
SAFETY FEATURES
Enclosed body, energy dissipation foam, safety I/F
Prevention of overload and overheat
PRICE
22 000 € single set in default configuration
LEAD TIME
8 - 14 weeks **
*
use case dependent
**
custom modifications dependent
Contact our team for custom modifications or price reductions of multiple units
UNIKA footage
Downloads
UNIKA documentation & models
Download the UNIKA datasheet and 3D model directly. For other documentation or product-specific guidance, please contact our team.
UNIKA 3D CAD model
Geometry for preliminary integration studies.
Need guidance for selection of your HDRM preload tool?
Speak with our engineering team about preload requirements or configuration tailored to your project.