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13027979 — NUT,SELF-LOCKING,KNURLED

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

13027979: NUT,SELF-LOCKING,KNURLED.

The NUT,SELF-LOCKING,KNURLED is a the manufacturer industrial component. Key specifications include end_item_identification: MG CAL .50 M2 HB FLEX GRND. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-531-0866, 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
13027979
NSN: 5310-01-531-0866
FSC: 5310 — Nuts and Washers
CAGE: 19200 — COMBAT CAPABILITIES DEVELOPMENT COMMAND (CCDC) ARMAMENTS CENTER DBA CCDC DIV LOGISTICS RESEARCH AND ENGINEERING DIRECTORATE (USA)
SPECIFICATIONS
end_item_identificationMG CAL .50 M2 HB FLEX GRND
NSN5310-01-531-0866
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 13027979 · 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
TECHNICAL CHARACTERISTICS
END ITEM IDENTIFICATIONMG CAL .50 M2 HB FLEX GRND
SUBSTITUTES & CROSS-REFERENCES 1
3440Reference 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 13027979?
13027979 is a NUT,SELF-LOCKING,KNURLED.
What parts can replace 13027979?
There is 1 known substitute for 13027979: 3440. Substitute compatibility should be verified for your specific system.
What is the NSN for 13027979?
13027979 is cataloged in the U.S. Government catalog under NSN 5310-01-531-0866. 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.