Release Nut (HDRM)
Dcubed
Non-explosive hold-down release mechanism using shape-memory alloy technology; secures spacecraft hardware during launch and releases on-orbit with high reliability.
About
Dcubed’s Release Nut is a non-explosive hold-down and release mechanism (HDRM) designed to secure satellite appendages, solar arrays, propulsion tanks, and other hardware during the vibration environment of launch, then release them precisely when commanded on orbit.
The Release Nut uses Dcubed’s patented shape-memory alloy (SMA) actuator technology. When triggered by a small electrical pulse, the SMA element contracts, displacing the nut mechanism and releasing the retained bolt. The actuation is gentle (no shock, no debris), repeatable in testing, and requires no pyrotechnic handling procedures.
Key specs:
– Preload hold force: up to 35 kN
– Actuation current: 3–5 A @ 28 V
– Actuation time: 1–3 seconds
– Operating temperature: -55°C to +125°C
– Interface: Standard M6 / M8 bolt
– Mass: ~50–120 g depending on configuration
The Release Nut ships from stock and is available in 6-week lead time. Flight heritage on 40+ satellites.
Documentation
No public datasheet yet — request the datasheet / ICD from the supplier.
