is the definitive global aerospace standard governing the installation, retention, and testing of spherical bearings used in critical structural housings. Formally titled "Bearing Installation and Retention by Swaging or Staking," this specification is managed by the Aerospace Industries Association (AIA). It provides strict guidelines that commercial and military aviation Maintenance, Repair, and Overhaul (MRO) facilities, as well as original equipment manufacturers (OEMs), must follow to ensure safety and structural integrity. Engineers and technicians frequently search for the NAS0331 PDF to access exact tolerances, mechanical methods, and proof-testing protocols.
This method utilizes rotary motion, typically via a drill press or specialized tri-roller tool, to deform the v-groove into the housing chamfer. It is preferred for precision applications because it minimizes axial pressure and impact on the bearing’s internal liner.
The latest revision, , spans 46 pages of highly detailed mechanical instructions, engineering drawings, and quality control metrics. It explicitly covers structural housing constraints, installation tolerances, and the physical deformation parameters required to secure a grooved outer race bearing.
standard, titled " Bearing Installation and Retention by Swaging or Staking nas0331 pdf
Procedures for verifying swage integrity (e.g., break-away torque, push-out force tests).
Details about the physical dimensions of the component, the type of package it's available in, and any relevant information for handling and assembly.
When procuring the , ensure you are downloading the most current revision, typically Rev. 2, to comply with the latest industry standards. is the definitive global aerospace standard governing the
This method employs a specialized tool with a ball-shaped tip to create a precise, repeatable impression on the housing material. It offers excellent precision and repeatability, making it suitable for a wide range of bearing sizes and configurations, and is common in aerospace, automotive, and industrial machinery applications where precision is paramount. It is often used on ductile housing materials.
Engineers, manufacturing technicians, and maintenance, repair, and overhaul (MRO) facilities rely heavily on the specification. It serves as a blueprint for maintaining structural integrity across both commercial aircraft and defense systems. 1. Overview of the NAS0331 Standard
| | Tool Type | Core Standard | Key Operational Parameters | | :--- | :--- | :--- | :--- | | Swaging | Tri-Roller Swager | NAS0331 Method 200 | Rotary motion, low axial pressure, continuous contact | | Swaging | Point Staking Tool | NAS0331 Method 300 / BAC5435 | Localized indentations, precise force control | | Staking | Anvil Die / Hydraulic Press | NAS0331 Method 100 | Linear press force, high volume production | Engineers and technicians frequently search for the NAS0331
Specifications for balls and outer rings made of specific alloys.
The full standard can be purchased as a secured PDF from authorized retailers such as the Accuris Standards Store or the AIA/NAS GlobalSpec .