What is a separation nut? The separation nut (Sep nut) is a pyrotechnic device designed as a high strength, fastening hardware with the ability to separate and/or release components or structures on demand.

Separation nuts utilize split-spool initiators as hold down preloading assemblies and 1/4 or 5/16 inch load attachment bolts as hold down release actuators. After electrical initiation, load deployment is facilitated by threaded-segment release of the load-attachment bolt.

Hold Down & Release Mechanisms, also sometimes referred to as Separation Nut Release Mechanisms, are offered in a range of sizes with load capacities up to a 500 kN (112,000 pounds force). Principle of Operation.

Eaton's non-explosive actuator solutions include G&H Technology separation nuts. These restraint and release devices utilize redundant, split-spool initiators to provide rapid releases with low power consumption.

Sierra Space offers the Fast-Acting Shockless Separation Nut (FASSN) 30K—a space-qualified, low-shock separation nut ideal for restraining and releasing satellite and launch vehicle preloaded structural joints.

Pyroalliance separation nuts are fully resettable on both Pyroalliance sites or customer facilities using cold gas (non pyro gas). The Spring allows resetting the parts in the initial position when actuated by cold gas.

Chemring Energetic Devices' separation nuts are designed and manufactured for use in applications where rapid structure separation is demanded. They are low shock and highly reliable for use in launch vehicles, satellites, and payload systems.

Separation nuts are a standard method used to release spacecraft deployable components. The segmented-nut design is simple, straightforward, and relatively easy to use. The nut segments are held together for retention of a bolt and then allowed to release through a mechanical action that is triggered on command.

The frangible nut is an explosively separated nut design used to sever mechanical connections, where the bolt or stud will remain intact while the nut itself is split into two or more pieces.

Pyroalliance designs a wide range of separation nuts, used for the in orbit deployment of antenna reflectors and solar generators on satellites or used for the separation of satellites of a constellation, assembled on a dispenser.