Separation Nut | Release Nut
When Milliseconds Matter™

Separation Nut.

Release Nut | Release Mechanism

PacSci EMC / Products / Separation Nut


As the global leader in pyrotechnic Hold Down & Release Mechanisms (HDRM) for space, aircraft and subsea applications. Whether in space, on an aircraft or in the sea, dependability is required for mission critical systems needing a release mechanisms that are designed and developed for low shock, highly reliable separation nuts for applications in submarine, launch vehicle, satellite, and payload systems.  An  example would be a HDRM for CubeSat and SmallSat launches. Our Mechanisms are custom made to meet your mission requirements, from the separation nut size to the specific materials, the success of your application is at the center point of our design.

Separation nuts are designed to provide mechanical release of various component devices. The most common design configuration consists of a housing containing a segmented thread interface which is compatible with the threads on the mating stud.

Most separation nuts are externally actuated using an impulse or pressure type cartridge. When the separation nut is pyrotechnically actuated the threaded segments will be allowed to move away and expand, resulting in the release of the mating device.

The separation nut provides a pyrotechnic solution for critical release events. Some of the most common uses include satellite deployment along with clamp release applications for weapons launch systems.

Our separation nut designs are qualified and used on

  • vertical rocket launches
  • anti-submarine rocket deployment systems
  • CubeSat deployment systems.
  • SmallSat deployment systems
  • Antennas
  • Scientific instruments
  • Solar arrays
  • Reflectors
  • Satellite, spacecraft and payloads
  • Booms and masts
  • Launch locks for gimbles, nozzles and thrusters

5.0/20 millisecond pulse

1 amp/1 watt for 5 minutes

Operating Temperature
-65 °F to +225 °F

Axial Load Retention
Tested with an axial load of 29,500 ± 500 pounds

Hermesticity (pre-function)
Leak rate shall not exceed 2.7 x 10-5 cc/sec of Helium at 1 atmosphere differential.

Applicable Specifications
Qualified to:



Separation nuts can be customized to fit many customer envelopes.



Need more information or have a specific requirement you would like us to meet?
Contact us at the link below, or for immediate assistance call 888.995.5359.

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