When Milliseconds Matter™

Frangible Nut.

Separation Nut | Sep Nut

(Explosively-splittable Nut)

Frangible Nut Separation Nut

If what you are looking for is reliability, precision and control, then PacSci EMC’s frangible nut is your answer to achieving your mission-critical goal.

How Frangible Nuts Work

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.

The frangible nut contains machined features that provide break plane location(s) (webs) to control the separation, fragmentation and the design’s breaking strength. Explosive booster assemblies are strategically located within the nut assembly, and upon actuation will separate the nut at the pre-determined break plane(s). The booster(s) are functioned simultaneously to ensure that the nut splits uniformly, allowing for a clean separation of the joined assemblies.


The Frangible Nut is used in applications requiring

    • launch vehicle hold down
    • release bulkhead
    • component release systems
    • jettison rockets, satellites or other components


The frangible nut design heritage includes Apollo, Space Shuttle’s Solid Rocket Booster/Mobile Launch Platform, X-33 and is currently in use for Atlas V and Delta IV launch vehicles.


  • Thread Size

    2.00 inch UNS Up to 3.50 inch

  • Operating Temperature

    -71°F to +220°F

  • Axial Load Retention

    Up to +1,000,000 lbf

  • Applicable Specifications

    Qualified to NHB5300.4(1C) NASA Standard


The frangible nut axial load retention strength and thread sizes can be tailored to meet your specific applications.

Frangible Nut Technical Envelope


Need more information or have a specific requirement you would like us to meet?
Please submit your information here or for immediate assistance call (888) 995-5359.

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