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REFERENCE IMAGE
EMANON PART NO.
NAS1640-416
NAS1640-416 is a washer in steel comp 420 overall and passivate overall finish.
Washer
REFERENCE IMAGEReference image — representative of the type, not the exact part; verify dimensions per specification.
SPECIFICATIONS
KEY DIMENSIONS
INSIDE DIAMETER0.255–0.263 in
OUTSIDE DIAMETER0.489 in nom
MATERIAL & FINISH
MATERIALSteel 420
MATERIAL SPEC66 FED STD ALL MATERIAL RESPONSES
FINISHPassivate
FINISH SPECQQ-P-35
MECHANICAL
HARDNESS35–43 HRC
STANDARDS & TRACEABILITY
NSN5310-00-087-3055
GOVERNING STANDARD80205-NAS1640
FLIS · NSN 5310-00-933-8121, 5310-00-087-3055 · retrieved 2026-08-08
DOCUMENTS
✓Certificate of Conformance — included with every order
No drawing on file — request it
NAS1640-416 Lock Washer
Emanon is a stocking distributor — quality-system certifications are held by the certified manufacturers we source from, not by Emanon. Every shipment carries manufacturer certifications and full lot traceability.