Aerospace flat washer in steel, stainless or aluminum, many thicknesses.
Plain round flat washer coded by material, screw size, thickness and finish. C is passivated stainless, F cadmium-plated carbon steel, D 2024 aluminum; thickness is called out in thousandths (e.g. 32 = .032 in., 63 = .063 in.).
| Where it's used | Load-spreading washer under bolt heads and nuts in airframe and equipment assembly. |
| Spec status | NAS1149 (AIA National Aerospace Standard, active); replaces AN960 (e.g. NAS1149CN432R = AN960C-4). |
A sample of what we've quoted and shipped under this spec. If your dash number isn't here, send it anyway. Every order ships with a Certificate of Conformance and lot records.
Need NAS1149 parts quoted?Send the part numbers and quantities. We usually quote within two business days.
Request a quote