The 2nd Edition was published on July 31, 2020 .
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The standard details two primary, distinct methods for bearing retention: swaging (defined as a method using rotary motion to form the bearing v-groove) and staking (defined as a method using a hydraulic press and stationary anvil dies to form the bearing v-groove). Understanding their differences is key to applying the standard correctly. nas0331 pdf
| NAS Standard | Focus Area | | :--- | :--- | | | Bearing Installation & Retention | | NAS1330 | High-strength countersunk head fasteners | | NAS4000 series | Composite materials and processes | | NAS5000 series | Hydraulic systems components |
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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? Reputable sources include: The standard details two primary,
| | 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 |
: Technicians reference the standard for proper bearing removal and replacement using specialized tooling.
The standard acts as an industry-wide blueprint for the permanent installation of spherical and plain bearings. It establishes strict guidelines to prevent bearing movement under extreme vibrational and operational loads without compromising the structural integrity of the surrounding housing. Document Metadata NAS0331 Bearing Specification Details | PDF - Scribd