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REFERENCE IMAGE
EMANON PART NO.
NAS1351C4-40
NAS1351C4-40 is a screw in steel comp 302 overall or steel comp 304 overall or steel comp 305 overall or steel comp 316 overall or steel comp 384 overall or steel comp xm-7 overall, passivate overall finish, 0.250 INCHES diameter and 2-1/2 length.
Screw
REFERENCE IMAGEReference image — representative of the type, not the exact part; verify dimensions per specification.
SPECIFICATIONS
KEY DIMENSIONS
DIAMETER0.250 in
LENGTH2.500 in (2-1/2)
THREAD LENGTH1.000 in MINIMUM
THREAD
THREAD1/4-28
HEAD & DRIVE
HEADFlat chamfer
HEAD HEIGHT0.244–0.250 in
WIDTH ACROSS FLATS0.1875–0.1900 in
MATERIAL & FINISH
MATERIALSteel 302/304/305/316 +2
MATERIAL SPEC66 FED STD or 66 FED STD or 66 FED STD or 66 FED STD or 66 FED STD or ASTM A493
FINISHPassivate
FINISH SPECQQ-P-35
MECHANICAL
TENSILE STRENGTH80,000 psi
HARDNESS≥80 HRB
STANDARDS & TRACEABILITY
NSN5305-00-430-9885
GOVERNING STANDARD80205-NAS1351
FLIS · NSN 5305-00-430-9885 · retrieved 2026-08-09
DOCUMENTS
✓Certificate of Conformance — included with every order
No drawing on file — request it
Fastener Length: 2-1/2", Thread: 1/4-28, Head Width: 3/16", Thread Length: 1", NAS1351 series screw
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.