The 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 predetermined 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.

Functions

The Frangible Nut is used in applications requiring

launch vehicle hold down

release bulkhead

component release systems

jettison rockets, satellites or other components

Applications

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.

PERFORMANCE CHARACTERISTICS

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