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59FH-820 — NUT,SELF-LOCKING,HEXAGON

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

59FH-820: NUT,SELF-LOCKING,HEXAGON.

The NUT,SELF-LOCKING,HEXAGON is a the manufacturer industrial component. Key specifications include thread_series: UNIFIED NATIONAL JOINT FINE (UNJF). This part is cataloged in the U.S.

Government catalog under NSN 5310-00-680-5666, 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
59FH-820
NSN: 5310-00-680-5666
NIINs: 006805666, 011800541
FSC: 5310 — Nuts and Washers
CAGE: 56878 — SPS TECHNOLOGIES, LLC DBA PB FASTENERS (USA)
SPECIFICATIONS
thread_seriesUNIFIED NATIONAL JOINT FINE (UNJF)
NSN5310-00-680-5666
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 59FH-820 · 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
•
WIDTH ACROSS FLATS: 0.741 INCHES MINIMUM AND 0.752 INCHES MAXIMUM IN
•
THREAD SERIES: UNF
•
PRECIOUS MATERIAL: SILVER
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 0.500 INCHES IN
•
SPECIFICATION/STANDARD DATA: 80205-NAS1021 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
•
LOCKING FEATURE: PREVAILING TORQUE ALL METAL DESIGN
•
NUT HEIGHT: 0.610 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.741 INCHES MINIMUM AND 0.752 INCHES MAXIMUM IN
THREAD SERIESUNF
PRECIOUS MATERIALSILVER
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.500 INCHES IN
SPECIFICATION/STANDARD DATA80205-NAS1021 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
LOCKING FEATUREPREVAILING TORQUE ALL METAL DESIGN
NUT HEIGHT0.610 INCHES NOMINAL IN
SURFACE TREATMENTSILVER OVERALL
THREAD CLASS3B
SUBSTITUTES & CROSS-REFERENCES 1
MILN25027Reference document
Same NSN cross-reference
Reference document — Identification reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 59FH-820?
59FH-820 is a NUT,SELF-LOCKING,HEXAGON.
What parts can replace 59FH-820?
There is 1 known substitute for 59FH-820: MILN25027. Substitute compatibility should be verified for your specific system.
What is the NSN for 59FH-820?
59FH-820 is cataloged in the U.S. Government catalog under NSN 5310-00-680-5666. 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.