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
Method 400 is designed for high-volume production. It uses a segmented tool that creates multiple, evenly spaced impressions simultaneously around the bearing's circumference. This process is highly efficient and provides uniform staking results, significantly reducing assembly time and labor costs.
The standard is divided into "Methods," which define how a bearing is permanently fixed into its housing:
: Represents the maximum grip length (the thickness of the materials being joined). cross-reference to a commercial equivalent like CherryMAX or Huck rivets? nas0331 pdf
A common point of confusion is the "NAS" prefix, which may lead to a search for "NAS0331 pdf" as a NASA document. However, NAS standards are created and published by the of America, not the National Aeronautics and Space Administration (NASA). In aerospace engineering, NAS standards define product specifications and uniform processes used across the entire industry. The official title of NAS0331 is "Bearing Installation and Retention by Swaging or Staking" . It ensures that the secure installation of critical components, such as bearings, is done reliably and consistently.
A typical includes data sheets and technical tables covering:
While the exact dimensions can vary slightly by revision, the standard configuration for NAS0331 typically includes: It uses a segmented tool that creates multiple,
: Recommended dimensions for the housings where bearings will be installed.
standard, titled " Bearing Installation and Retention by Swaging or Staking
Requirements for how easily the bearing must rotate after being swaged, ensuring the retention process hasn't deformed the internal race. Surface Integrity: cross-reference to a commercial equivalent like CherryMAX or
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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