Pdf: Nas0331
Specifically, pertains to Fluid Fittings and Caps . More precisely, it covers the dimensional standards for protective caps and plugs used on hydraulic and pneumatic tubing during assembly, shipping, and painting.
You cannot legally download the full standard for free from a supplier, but you can get the exact technical data. Major distributors like , Boeing Distribution , or Wurth Industry often host spec sheets. Search their site for "NAS0331-6" (or whatever dash number you need). The product page usually displays: nas0331 pdf