Separation Nut PSM 3/8B
Beyond Gravity (ex-RUAG Space)
Smallest low-shock separation nut of the family, developed to fit OneWeb-class satellites of typically 100-200 kg.
Typed specifications16 values
Discloses 5 of 10 fields engineers filter by in this category (category median 2).
- Mass
- 230 g datasheet p.3
- Preload / holding force
- 25 kN nominal · datasheet p.3 25 kN nom.
- Envelope (L×W×H)
- Height 58.5 mm datasheet p.3
- Release time
- 2 ms dispersion · datasheet p.3
- Operating temperature
- -68–120 °C qualification temperature span · datasheet p.3
- Separation type
- pyrotechnic datasheet p.3 point separation bolts or nuts low shock separation nut
- Interface diameter
- 46 mm attachment · datasheet p.3
- Number of bolts or points
- 2 attachment · datasheet p.3
- Max spacecraft mass
- 200 kg max · typical · datasheet p.1
- Release command type
- pyro firing pulse initiated by dual NSI equivalent initiators (PC23, 103377-191… · datasheet p.2
- Command pulse duration
- 2 ms max · release time dispersion · datasheet p.3
- Random vibration
- 50 g RMS overall random vibration levels (Qualification) · datasheet p.3
- Satellite class
- smallsat 100-500 kg developed to fit the One Web class of satellites, typical 100… · datasheet p.1
- Stack height
- 58.5 mm datasheet p.3
Each value is typed with its unit and measurement condition and cites the datasheet page it was taken from. Nothing is guessed: a field that is absent here has not been published by the manufacturer. machine-extracted ✓ checked by NewSpace Market ✓ manufacturer confirmed by the manufacturer.
As published by the supplier12 lines, in the manufacturer's own wording
- Target spacecraft class
- OneWeb class satellites, typically 100-200 kg
- Qualification
- AIAA S-113-2005 (former DOD-E-83578A)
- Initiators
- Dual NSI equivalent (PC23, 103377-191/-449/-500, PD222400024-009, 2-8001140-1, 852420-XX)
- Worst-case tests passed
- Single 80% initiator, cold case, no internal lube, no o-ring, 150% external load - 100% success
- Design feature
- Internal mechanical leverage reduces initiator pressure spike and shock; wide thermal operation range
- Bolt pretension
- 25 kN
- Mass
- 0.23 kg
- Dimensions
- 58.5 mm
- Interface
- UNF/UNJF 3/8’’-24 Class 3 A
- Overall random vibration
- 50 gRMS
- Release time dispersion
- Within 2.0 ms
- Reliability
- 0.99995 at a 95% confidence level
About
The Beyond Gravity PSM 3/8B Separation Nut is the smallest member of the family of Low Shock Separation Nuts designed for interfacing small sized spacecraft with launch vehicles. It has been developed to fit the OneWeb class of satellites, typically 100-200 kg.
The PSM 3/8B introduces an internal mechanical leverage minimizing the required pressure spike generated by the initiators. Hence the shock is significantly reduced without sacrifice of reliability compared with heritage separation nuts.
The separation nut avoids metals with different thermal expansion coefficients to achieve a wide thermal operation range. It has been designed as a direct drop-in replacement for many of the classical higher shock separation nuts.
It is qualified per AIAA S-113-2005 (former DOD-E-83578A) and initiated by dual NSI equivalent initiators. Worst case scenarios were tested with 100% success: single 80% initiator, cold case, no internal lube, no o-ring, and 150% external load.
Documentation
Need the full ICD, test reports or a specific revision? Ask the supplier directly.