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NAS1291C5M — NUT,SELF-LOCKING,EXTENDED WASHER

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

NAS1291C5M: NUT,SELF-LOCKING,EXTENDED WASHER.

NUT,SELF-LOCKING,EXTENDED WASHER. Key specifications include material: STEEL CORROSION RESISTING OVERALL, nut_style: HEXAGON, temp_rating: 550.0 FAHRENHEIT NOMINAL DEGF, thread_class: 3B, thread_series: UNF, overall_height: 0.253 INCHES MINIMUM AND 0.266 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-882-6479, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
NAS1291C5M
NSN: 5310-00-882-6479
FSC: 5310 — Nuts and Washers
CAGE: 80205 — NATIONAL AEROSPACE STANDARDS COMMITTEE AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA INC NOT FOR RFQ OR SOLICITATION USE (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
nut_styleHEXAGON
temp_rating550.0 FAHRENHEIT NOMINAL DEGF
thread_class3B
thread_seriesUNF
overall_height0.253 INCHES MINIMUM AND 0.266 INCHES MAXIMUM IN
locking_featurePREVAILING TORQUE ALL METAL DESIGN
thread_directionRIGHT-HAND
washer_thickness0.022 INCHES NOMINAL IN
surface_treatmentPASSIVATE OVERALL
width_across_flats0.367 INCHES MINIMUM AND 0.378 INCHES MAXIMUM IN
nominal_thread_size0.312 INCHES IN
NSN5310-00-882-6479
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: NAS1291C5M · OEM ⚠ VERIFY BEFORE ORDERING Grade matters for torque spec — don't mix grades. A Grade 5 nut on a Grade 8 bolt weakens the joint. Lock nuts, wing nuts, and castle nuts are NOT interchangeable with standard hex ✓ BROKER TIP Match nut to bolt thread class and material. Stainless bolt + zinc nut = galvanic corrosion. Always verify finish matches (plain, zinc, hot-dip galvanized) PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
WASHER OUTSIDE DIAMETER: 0.520 INCHES NOMINAL IN
•
WIDTH ACROSS FLATS: 0.367 INCHES MINIMUM AND 0.378 INCHES MAXIMUM IN
•
THREAD SERIES: UNF
•
TEMP RATING: 550.0 FAHRENHEIT NOMINAL DEGF
•
WASHER THICKNESS: 0.022 INCHES NOMINAL IN
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 0.312 INCHES IN
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.253 INCHES MINIMUM AND 0.266 INCHES MAXIMUM IN
WASHER OUTSIDE DIAMETER0.520 INCHES NOMINAL IN
WIDTH ACROSS FLATS0.367 INCHES MINIMUM AND 0.378 INCHES MAXIMUM IN
THREAD SERIESUNF
TEMP RATING550.0 FAHRENHEIT NOMINAL DEGF
WASHER THICKNESS0.022 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.312 INCHES IN
SPECIFICATION/STANDARD DATA80205-NAS1291 GOVERNMENT STANDARD
LOCKING FEATUREPREVAILING TORQUE ALL METAL DESIGN
SUBSTITUTES & CROSS-REFERENCES 7
RMLH3858-054Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
H42-5Reference document
Same NSN cross-reference
Reference document — Secondary reference
P32335Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
860292-0009Reference document
Same NSN cross-reference
Reference document — Secondary reference
403130135Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
BH00205-5Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is NAS1291C5M?
NAS1291C5M is a NUT,SELF-LOCKING,EXTENDED WASHER.
What parts can replace NAS1291C5M?
There are 7 known substitutes for NAS1291C5M: RMLH3858-054, H42-5, P32335 and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for NAS1291C5M?
NAS1291C5M is cataloged in the U.S. Government catalog under NSN 5310-00-882-6479. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.