The specification, formally titled "SCREW, MACHINE - PAN HEAD, CROSS RECESS, FILLISTER HEAD, DRILLED, 100 DEGREE COUNTERSUNK HEAD, CORROSION AND HEAT RESISTANT STEEL, UNJF THREAD" (note: always verify the exact title with the latest AIA/NAS release), defines a specific family of precision fasteners used in extreme environments.
Includes hardness requirements (e.g., outer ring Rc 28–37 before swaging) and surface texture limits.
Nut, Self-Locking, Floating, Two-Lug, Reduced Height, Aluminum Alloy
In case you are looking for a direct link or document I will let you know that I do not have the capability to provide you with a direct link or the document itself but I can guide you through the process.
For any mathematical equations I will make sure to use $$ syntax without newlines for example $$x+5=10$$. nas0331 pdf
I'm assuming you're referring to the NAS0331 specification, which is a standard for "Quality Management Systems - Requirements" published by the National Aerospace Standards (NAS) committee.
: Ensures that the internal radial play and no-load torque values of the bearing have not been compressed or compromised by excessive installation forces.
Purchase directly from the Accuris Standards Store (formerly IHS Markit).
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. The specification, formally titled "SCREW, MACHINE - PAN
Originally published in June 1992, the document has gone through key revisions to keep pace with changing metallurgy and precision tooling, with Revision 2 representing the active baseline for current operations. Official, secure PDF versions are strictly controlled and distributed by authorized technical hubs such as the Accuris Standards Store . Core Methodologies: Staking vs. Swaging
The preferred method for high-precision, low-impact installations. A specialized rotary tool containing three independent rollers spins under load—typically via a drill press or vertical mill. The tool smoothly deforms the bearing’s integrated V-groove outwards into the housing chamfer.
It defines the mandatory requirements and recommended practices for installing self-lubricating or plain bearings into metal housing components, such as airframe structures, control linkages, and landing gear assemblies. Key Components of the NAS0331 Document
The NAS0331 standard is segmented into distinctive technical "Methods" that govern the physical manipulation of the bearing race or housing. The choice of method dictates the tooling, force profile, and mechanical footprint left on the assembly: AIA NAS0331 - Accuris Standards Store For any mathematical equations I will make sure
This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later. AIA NAS0331 - Accuris Standards Store
For engineers, maintenance technicians, and procurement specialists, finding the correct is essential for ensuring compliance with safety and performance regulations. What is the NAS0331 Standard?
Recommended dimensions for the housing bore, chamfers, and edge distances to ensure optimal retention.