: Technicians also verify these by head markings, such as a single dimple for "AD" rivets or two raised dashes for "DD" (2024 alloy) rivets. 3. Installation Requirements (SW Quadrant)
The cabinet door groaned. Inside, slender drives were arranged in tiers, mirrors reflecting mirrors, a dizzying echo of LEDs. One crate lay empty — a cavity shaped for a drive no longer present. The cavity’s back panel had been pried open; beneath it, something metallic shone: a small, crumpled drive labeled with her own initials. nas523 pdf
Northwest (NW) | Northeast (NE) [Fastener Part No. | [Rivet Diameter & & Material Code] | Mfg. Head Location] ------------------------+------------------------ Southwest (SW) | Southeast (SE) [Sheet Preparation: | [Fastener Length & Dimple / Countersink]| Optional Methods] 1. Northwest (NW) Quadrant: Part Number & Material : Technicians also verify these by head markings,
The standard defines the non-metallic materials allowed for the washer. Typically, these include: Inside, slender drives were arranged in tiers, mirrors
: Sheet metal surfaces must be pressed into a dimple mold using dedicated dies when sheet stock is too thin to shave down.
Official, copyrighted copies of the complete standard practice can be purchased directly via the Accuris Standards Store or GlobalSpec . Anatomy of the NAS523 "Crosshair" Symbol
NAS523 specifically covers fasteners that undergo permanent deformation during installation, meaning they must be destroyed to be removed. Material Identification: