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PartsTable / COMPONENT / 2643-820-88 ITEM 26L1
2643-820-88 ITEM 26L1 ✓ Verified by PartsTable
— · NUT WASHER
WHAT YOU NEED TO KNOW
Match nut grade to bolt grade for full strength Lock nuts prevent loosening under vibration
Don't mix grades — weakens the joint
PRODUCT OVERVIEW

The NUT,SELF-LOCKING,HEXAGON is a the manufacturer industrial component. Key specifications include criticality_code_justification: ZZZX, departure_from_cited_designator: MATERIAL CONTROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONTROL STANDARD FOR LEVEL I ITEMS. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-270-8662, 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
2643-820-88 ITEM 26L1
NSN: 5310-01-270-8662
FSC: 5310
CAGE: 03950 — NAVAL INVENTORY CONTROL POINT MECHANICSBURG (USA)
SPECIFICATIONS
criticality_code_justificationZZZX
departure_from_cited_designatorMATERIAL CONTROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONTROL STANDARD FOR LEVEL I ITEMS
NSN5310-01-270-8662
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 2643-820-88 ITEM 26L1 · 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
•
DEPARTURE FROM CITED DESIGNATOR: MATERIAL CONTROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONTROL STANDARD FOR LEVEL I ITEMS
•
CRITICALITY CODE JUSTIFICATION: ZZZX
TECHNICAL CHARACTERISTICS (FLIS)
DEPARTURE FROM CITED DESIGNATORMATERIAL CONTROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONTROL STANDARD FOR LEVEL I ITEMS
CRITICALITY CODE JUSTIFICATIONZZZX
VERIFIED SUBSTITUTES & CROSS-REFERENCES 18
6002-154 PIECE 5Interchangeable
interchangeable cross-reference
interchangeable
211070742Interchangeable
interchangeable cross-reference
interchangeable
6404856 FIND 15L1Interchangeable
interchangeable cross-reference
interchangeable
5310PL2080056Interchangeable
interchangeable cross-reference
interchangeable
845-7284929 ITEM 25Interchangeable
interchangeable cross-reference
interchangeable
1/2-13UNC-3B (MIL-N-25027)Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 2643-820-88 ITEM 26L1?
2643-820-88 ITEM 26L1 is a NUT,SELF-LOCKING,HEXAGON.
What parts can replace 2643-820-88 ITEM 26L1?
There are 18 known substitutes for 2643-820-88 ITEM 26L1: 6002-154 PIECE 5, 211070742, 6404856 FIND 15L1 and 15 more. Substitute compatibility should be verified for your specific system.
Is 2643-820-88 ITEM 26L1 still available?
2643-820-88 ITEM 26L1 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026