: Aircraft skin-to-frame attachments, structural repairs, and assemblies where access is limited to only one side (hence "blind"). How to Access the PDF
NAS0331 (National Aerospace Standard 0331) establishes critical industry requirements for the installation and retention of aerospace bearings using swaging and staking techniques, focusing on material compatibility and load capacity. The standard defines precise specifications for housing tolerances, no-load torque values, and inspection criteria to ensure structural integrity. For more details, visit Globalspec NAS0331 Bearing Specification Details | PDF - Scribd
NAS0331 is widely cited for its standardized installation techniques, often referred to by method numbers:
To obtain an official, fully licensed, and up-to-date secure PDF copy, track industry changes through authorized technical standard vendors: nas0331 pdf
Nondestructive examination procedures, including penetrant inspection. Related Tooling and Hardware
If you are setting up a manufacturing line or troubleshooting an inspection failure, let me know you are using or the specific housing material involved so we can look deeper into the exact torque, load, or tooling requirements. Share public link
Nut, Self-Locking, Floating, Two-Lug, Reduced Height, Aluminum Alloy Staking involves using a hydraulic
: Used for specific geometric limitations where standard rolling tool paths are obstructed. Critical Tooling Specifications
Some companies and research groups use internal numbering like NASxxxx (e.g., Northrop Grumman or NATO Air Standard). In that case, the feature would need to be written from your provided content.
The is a critical document published by the Aerospace Industries Association (AIA) , establishing the uniform requirements for bearing installation and retention by swaging or staking . Originally issued as NAS-331, the updated and current iteration is NAS0331 (specifically Revision 2) . This framework dictates how spherical, plain, and self-lubricating bearings are mechanically secured into structural housings across commercial aircraft, defense systems, and maintenance, repair, and overhaul (MRO) operations. Engineers, procurement specialists, and quality control technicians frequently search for the NAS0331 PDF to access exact housing dimensions, tool specifications, testing methodologies, and material deformation limits. What is the NAS0331 Standard? or catastrophic mechanical failure.
Because NAS0331 is an active engineering standard protecting flight safety, bootleg or unverified free PDF uploads found on public document sharing platforms should be strictly avoided. Outdated revisions can result in failed quality audits, rejected assemblies, or catastrophic mechanical failure.
Staking involves using a hydraulic, mechanical, or pneumatic press to apply high axial force to the bearing's V-groove.