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REFERENCE IMAGE
EMANON PART NO.
NAS1351N4-20
NAS1351N4-20 is a screw in iron alloy 660, passivate finish, 0.250 INCHES diameter and Between 1.210 inches and 1.250 inches length.
Screw
REFERENCE IMAGEReference image — representative of the type, not the exact part; verify dimensions per specification.
SPECIFICATIONS
KEY DIMENSIONS
DIAMETER0.250 in
LENGTH1.210–1.250 in
THREAD LENGTH1.000 in MINIMUM
THREAD
THREAD0.250-28 UNRF-3A right-hand
HEAD & DRIVE
HEADFlat chamfer
HEAD HEIGHT0.244–0.250 in
WIDTH ACROSS FLATS0.1875–0.1900 in
MATERIAL & FINISH
MATERIALIron 660
MATERIAL SPECAMS 5731 or AMS 5737
FINISHPassivate
FINISH SPECQQ-P-35
STANDARDS & TRACEABILITY
NSN5305-01-080-9184
GOVERNING STANDARD80205-NAS1351
FLIS · NSN 5305-01-080-9184 · retrieved 2026-08-07
DOCUMENTS
✓Certificate of Conformance — included with every order
No drawing on file — request it
NAS1351N4-20
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.