Nas0331 Pdf Jun 2026
The standard incorporates precise and specifies that the bore diameters and tolerances of the housing must comply with Requirement 202 of MIL-STD-1599 . MIL-STD-1599 is a military standard that specifies all required methods for using bearings, control system components, and associated hardware in the design and construction of aerospace mechanical systems. By referencing MIL-STD-1599, NAS0331 ensures that the housing is prepared to an exacting military standard for aerospace use.
Similar to swaging, staking uses localized pressure to deform the housing material around the bearing to "lock" it in place. Method 200:
This includes information on voltage ratings, current capacities, power dissipation, and other electrical parameters crucial for designing circuits and ensuring compatibility. nas0331 pdf
are often used for bearing installation and meet requirements for key specifications like NAS0331 Method 200.
NAS0331 addresses this by outlining how to displace the metal of either the bearing's V-groove or the housing itself to form a permanent mechanical lock. The standard applies to any structural housing material (such as aluminum, titanium, or steel alloys) and focuses predominantly on standard Military Specification (Mil-Spec) Corrosion Resistant Steel (CRES) race bearings. AIA NAS0331 - Accuris Standards Store The standard incorporates precise and specifies that the
The key principles of NAS0331 are:
Merely deforming the metal is not enough; the installation must be validated through rigid quality control metrics detailed inside the NAS0331 manual. Similar to swaging, staking uses localized pressure to
The aerospace standard (formally titled Bearing Installation and Retention by Swaging or Staking ) is the foundational regulatory document governing how spherical and plain bearings are secured into aircraft structural housings. Published by the Aerospace Industries Association (AIA), this standard ensures that bearings subjected to extreme flight vibration, flight control manipulation, and intense structural loads do not back out or fail.
Access to the official NAS0331 document is essential for compliance. The current active version is , revision published on July 31, 2020 . Superseded editions include NAS0331-1992 and NAS331:2013, which have been replaced by the 2020 revision.
Risks associated with improper bearing migration or retention failure.
. This standard ensures that bearings—essential for the movement of landing gears, engine mounts, and flight controls—remain securely fastened under extreme vibration and pressure. Core Methods Defined by NAS0331 Staking (Method 100)
