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Technical Data Sheet
PartsTable / COMPONENT / 124-1998521 PART NO. 57
124-1998521 PART NO. 57 ✓ 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. 57 is a the manufacturer industrial component. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-768-0321, 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. 57
NSN: 5310-00-768-0321
FSC: 5310
CAGE: 53711 — NAVAL SEA SYSTEMS COMMAND (USA)
SPECIFICATIONS
Part Number124-1998521 PART NO. 57
NSN5310-00-768-0321
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 124-1998521 PART NO. 57 · 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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
37960Interchangeable
interchangeable cross-reference
interchangeable
900165-5Interchangeable
interchangeable cross-reference
interchangeable
W1035Interchangeable
interchangeable cross-reference
interchangeable
X-2Interchangeable
interchangeable cross-reference
interchangeable
SSTL1-2-13Interchangeable
interchangeable cross-reference
interchangeable
313-0278-00Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 124-1998521 PART NO. 57?
124-1998521 PART NO. 57 is a 124-1998521 PART NO. 57.
What parts can replace 124-1998521 PART NO. 57?
There are 15 known substitutes for 124-1998521 PART NO. 57: 37960, 900165-5, W1035 and 12 more. Substitute compatibility should be verified for your specific system.
Is 124-1998521 PART NO. 57 still available?
124-1998521 PART NO. 57 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