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PartsTable / COMPONENT / ESP-E-56-221-NPP
ESP-E-56-221-NPP ✓ 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 product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-188-4635, 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
ESP-E-56-221-NPP
NSN: 5310-01-188-4635
FSC: 5310
CAGE: 338X5 — ND DEFENSE LLC (USA)
SPECIFICATIONS
Part NumberESP-E-56-221-NPP
NSN5310-01-188-4635
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: ESP-E-56-221-NPP · 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 10
25051R1Interchangeable
interchangeable cross-reference
interchangeable
273896Interchangeable
interchangeable cross-reference
interchangeable
ESP-E-56-221-NPPInterchangeable
interchangeable cross-reference
interchangeable
12759-00524Interchangeable
interchangeable cross-reference
interchangeable
9411658Interchangeable
interchangeable cross-reference
interchangeable
37312Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is ESP-E-56-221-NPP?
ESP-E-56-221-NPP is a NUT,PLAIN,HEXAGON.
What parts can replace ESP-E-56-221-NPP?
There are 10 known substitutes for ESP-E-56-221-NPP: 25051R1, 273896, ESP-E-56-221-NPP and 7 more. Substitute compatibility should be verified for your specific system.
What is the NSN for ESP-E-56-221-NPP?
ESP-E-56-221-NPP is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-188-4635. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026