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Technical Data Sheet
PartsTable / COMPONENT / 7978-556R51PC23
7978-556R51PC23 ✓ 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,PLAIN,HEXAGON 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
7978-556R51PC23
NSN: 5310-00-768-0321
FSC: 5310
CAGE: 81316 — PORTSMOUTH NAVAL SHIPYARD (USA)
SPECIFICATIONS
Part Number7978-556R51PC23
NSN5310-00-768-0321
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 7978-556R51PC23 · 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 7978-556R51PC23?
7978-556R51PC23 is a NUT,PLAIN,HEXAGON.
What parts can replace 7978-556R51PC23?
There are 15 known substitutes for 7978-556R51PC23: 37960, 900165-5, W1035 and 12 more. Substitute compatibility should be verified for your specific system.
Is 7978-556R51PC23 still available?
7978-556R51PC23 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