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Technical Data Sheet
PartsTable / COMPONENT / 124-1998521 PART NO. 7
124-1998521 PART NO. 7 ✓ 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 124-1998521 PART NO. 7 is a the manufacturer industrial component. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-764-6610, 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
124-1998521 PART NO. 7
NSN: 5310-00-764-6610
FSC: 5310
CAGE: 53711 — NAVAL SEA SYSTEMS COMMAND (USA)
SPECIFICATIONS
Part Number124-1998521 PART NO. 7
NSN5310-00-764-6610
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 124-1998521 PART NO. 7 · 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
•
NUT STYLE: HEXAGON
•
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
•
THREAD QUANTITY PER INCH: 9
•
BEARING SURFACE TYPE: CHAMFERED OR WASHER FACED
•
NOMINAL THREAD SIZE: 0.875 INCHES IN
•
WIDTH ACROSS FLATS: 1.2690 INCHES MINIMUM AND 1.3125 INCHES MAXIMUM IN
•
THREAD DIRECTION: RIGHT-HAND
•
MATERIAL DOCUMENT AND CLASSIFICATION: FED 66 FED STD SINGLE MATERIAL RESPONSE OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
NUT STYLEHEXAGON
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
THREAD QUANTITY PER INCH9
BEARING SURFACE TYPECHAMFERED OR WASHER FACED
NOMINAL THREAD SIZE0.875 INCHES IN
WIDTH ACROSS FLATS1.2690 INCHES MINIMUM AND 1.3125 INCHES MAXIMUM IN
THREAD DIRECTIONRIGHT-HAND
MATERIAL DOCUMENT AND CLASSIFICATIONFED 66 FED STD SINGLE MATERIAL RESPONSE OVERALL
SURFACE TREATMENTPASSIVATE OVERALL
NUT HEIGHT0.724 INCHES MINIMUM AND 0.776 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 12
510008Interchangeable
interchangeable cross-reference
interchangeable
805-1400051PC8Interchangeable
interchangeable cross-reference
interchangeable
5315PL1246629Interchangeable
interchangeable cross-reference
interchangeable
DE015Interchangeable
interchangeable cross-reference
interchangeable
805-1400051 PC6Interchangeable
Same NIIN cross-reference
interchangeable
805-1400053 PC 6Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 124-1998521 PART NO. 7?
124-1998521 PART NO. 7 is a 124-1998521 PART NO. 7.
What parts can replace 124-1998521 PART NO. 7?
There are 12 known substitutes for 124-1998521 PART NO. 7: 510008, 805-1400051PC8, 5315PL1246629 and 9 more. Substitute compatibility should be verified for your specific system.
Is 124-1998521 PART NO. 7 still available?
124-1998521 PART NO. 7 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