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5310-021-9 — NUT,SELF-LOCKING,SPLINE

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

5310-021-9: NUT,SELF-LOCKING,SPLINE.

The NUT,SELF-LOCKING,SPLINE is a the manufacturer industrial component. Key specifications include thread_series: UNIFIED NATIONAL JOINT FINE (UNJF), nominal_thread_size: 0.563 INCHES IN, thread_quantity_per_inch: 18. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-338-5719, 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
5310-021-9
NSN: 5310-01-338-5719
FSC: 5310 — Nuts and Washers
CAGE: S7549 — AIDC/AEROSPACE INDUSTRIAL DEVELOPMENT CORP. DBA AIDC
SPECIFICATIONS
thread_seriesUNIFIED NATIONAL JOINT FINE (UNJF)
nominal_thread_size0.563 INCHES IN
thread_quantity_per_inch18
NSN5310-01-338-5719
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 5310-021-9 · 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
•
THREAD SERIES: UNIFIED NATIONAL JOINT FINE (UNJF)
•
NOMINAL THREAD SIZE: 0.563 INCHES IN
•
THREAD QUANTITY PER INCH: 18
TECHNICAL CHARACTERISTICS
THREAD SERIESUNIFIED NATIONAL JOINT FINE (UNJF)
NOMINAL THREAD SIZE0.563 INCHES IN
THREAD QUANTITY PER INCH18
SUBSTITUTES & CROSS-REFERENCES 1
RMLH11922-9Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 5310-021-9?
5310-021-9 is a NUT,SELF-LOCKING,SPLINE.
What parts can replace 5310-021-9?
There is 1 known substitute for 5310-021-9: RMLH11922-9. Substitute compatibility should be verified for your specific system.
What is the NSN for 5310-021-9?
5310-021-9 is cataloged in the U.S. Government catalog under NSN 5310-01-338-5719. 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.