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.
For official copies, you can access the standard through licensed distributors like Accuris Standards Store or the AIA/NAS site . Aerospace Bearing Tools - The Bearing Specialist nas0331 pdf
Common user intents when searching this string: The specification, formally titled "SCREW, MACHINE - PAN
Access to the official NAS0331 document is essential for compliance. The current active version is , revision published on July 31, 2020 . Superseded editions include NAS0331-1992 and NAS331:2013, which have been replaced by the 2020 revision. The current active version is , revision published
: Displaces a ring of material from the outer race groove directly into the structural housing.
These fasteners are commonly found in jet engine assemblies, airframe primary structures, and missile systems where temperatures exceed the limits of standard stainless steel.
The current active version is , published on July 31, 2020 . It typically spans approximately 46 pages. NAS0331 Bearing Specification Details | PDF - Scribd