Frangible Nut
When Milliseconds Matter™

Frangible Nut.

Separation Nut | Sep Nut

PacSci EMC / Products / Frangible 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.

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?
Contact us at the link below, or for immediate assistance call 888.995.5359.

Contact Us

Back to Top