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218552 ✓ 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 COUPLING,SHAFT,RIGID is a the manufacturer industrial component. Key specifications include body_material: STEEL CORROSION RESISTING, surface_treatment: PASSIVATE. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-021-8552, 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
218552
NSN: 5310-00-021-8552
FSC: 5310
CAGE: 7X677 — GENERAL MOTORS LLC DBA GENERAL MOTORS LLC (USA)
SPECIFICATIONS
body_materialSTEEL CORROSION RESISTING
surface_treatmentPASSIVATE
NSN5310-00-021-8552
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 218552 · 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
•
WIDTH ACROSS FLATS: 0.1800 INCHES MINIMUM AND 0.1875 INCHES MAXIMUM IN
•
THREAD QUANTITY PER INCH: 56
•
NOMINAL THREAD SIZE: 0.099 INCHES IN
•
BEARING SURFACE TYPE: FLAT
•
THREAD SERIES: UNF
•
THREAD CLASS: 2B
•
NONDEFINITIVE SPEC/STD DATA: C GROUP AND 2 TYPE AND 1 STYLE AND A GRADE
•
THREAD DIRECTION: RIGHT-HAND
TECHNICAL CHARACTERISTICS (FLIS)
WIDTH ACROSS FLATS0.1800 INCHES MINIMUM AND 0.1875 INCHES MAXIMUM IN
THREAD QUANTITY PER INCH56
NOMINAL THREAD SIZE0.099 INCHES IN
BEARING SURFACE TYPEFLAT
THREAD SERIESUNF
THREAD CLASS2B
NONDEFINITIVE SPEC/STD DATAC GROUP AND 2 TYPE AND 1 STYLE AND A GRADE
THREAD DIRECTIONRIGHT-HAND
MATERIALSTEEL OVERALL
NUT HEIGHT0.057 INCHES MINIMUM AND 0.066 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 19
103089Interchangeable
interchangeable cross-reference
interchangeable
340543Interchangeable
interchangeable cross-reference
interchangeable
BBKX2DInterchangeable
interchangeable cross-reference
interchangeable
110921Interchangeable
interchangeable cross-reference
interchangeable
FFN836GPCTYPE2STYLE1GRADEAInterchangeable
interchangeable cross-reference
interchangeable
110922Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 218552?
218552 is a COUPLING,SHAFT,RIGID.
What parts can replace 218552?
There are 19 known substitutes for 218552: 103089, 340543, BBKX2D and 16 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 218552?
218552 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-021-8552. 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