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5HB121 — NUT,SELF-LOCKING,HEXAGON

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

5HB121: NUT,SELF-LOCKING,HEXAGON.

The NUT,SELF-LOCKING,HEXAGON is a the manufacturer industrial component. Key specifications include material: STEEL NUT, nominal_thread_size: 0.250 INCHES IN, end_item_identification: END ITEM NSN: 3990-01-444-6174; PALLETIZED LOADING SYSTEM (PLS) M1074, M1075, M1076, M1077, part_name_assigned_by_controlling_agency: NUT-HEX, LOCK, 0.25, GR8, PN. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-540-9411, 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
5HB121
NSN: 5310-01-540-9411
FSC: 5310 — Nuts and Washers
CAGE: 75Q65 — OSHKOSH DEFENSE LLC (USA)
SPECIFICATIONS
materialSTEEL NUT
nominal_thread_size0.250 INCHES IN
end_item_identificationEND ITEM NSN: 3990-01-444-6174; PALLETIZED LOADING SYSTEM (PLS) M1074, M1075, M1076, M1077
part_name_assigned_by_controlling_agencyNUT-HEX, LOCK, 0.25, GR8, PN
NSN5310-01-540-9411
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 5HB121 · 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
•
NOMINAL THREAD SIZE: 0.250 INCHES IN
•
MATERIAL: STEEL NUT
TECHNICAL CHARACTERISTICS
NOMINAL THREAD SIZE0.250 INCHES IN
PART NAME ASSIGNED BY CONTROLLING AGENCYNUT-HEX, LOCK, 0.25, GR8, PN
END ITEM IDENTIFICATIONEND ITEM NSN: 3990-01-444-6174; PALLETIZED LOADING SYSTEM (PLS) M1074, M1075, M1076, M1077
MATERIALSTEEL NUT
OTHER ITEMS IN FSC 5310 — Nuts and Washers
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5310-00-000-0040 5310-00-000-0077 5310-00-000-0079 5310-00-000-1146 5310-00-000-3815 5310-00-000-4532 5310-00-000-4540
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 5HB121?
5HB121 is a NUT,SELF-LOCKING,HEXAGON.
What is the NSN for 5HB121?
5HB121 is cataloged in the U.S. Government catalog under NSN 5310-01-540-9411. 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.