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218408 ✓ 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 FRAME,SEAT,VEHICULAR is a the manufacturer industrial component. Key specifications include part_name_assigned_by_controlling_agency: FRAME,CMDR'S SEAT. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-021-8408, 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
218408
NSN: 5310-00-021-8408
FSC: 5310
CAGE: 29930 — INTERNATIONAL HARVESTER CO AGRICULTURAL EQUIPMENT DIV (USA)
SPECIFICATIONS
end_item_identificationDIRECT VENDOR DELIVERY(DVD),MODEL XM1117,ARMORED SECURITY VEHICLE(ASV),NSN 2320-01-437-6957,CAGE 10237,PART NUMBER 216098, TM 9-2320-307-24P, CONTRACT DAAE07-99-C-S001
part_name_assigned_by_controlling_agencyFRAME,CMDR'S SEAT
NSN5310-00-021-8408
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 218408 · 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
•
THREAD DIRECTION: RIGHT-HAND
•
THREAD QUANTITY PER INCH: 12
•
NUT HEIGHT: 1.063 INCHES NOMINAL IN
•
NOMINAL THREAD SIZE: 1.250 INCHES IN
•
BEARING SURFACE TYPE: WASHER FACED
•
THREAD SERIES: UNF
•
WIDTH ACROSS FLATS: 1.875 INCHES NOMINAL IN
•
NUT STYLE: HEXAGON
TECHNICAL CHARACTERISTICS (FLIS)
THREAD DIRECTIONRIGHT-HAND
THREAD QUANTITY PER INCH12
NUT HEIGHT1.063 INCHES NOMINAL IN
NOMINAL THREAD SIZE1.250 INCHES IN
BEARING SURFACE TYPEWASHER FACED
THREAD SERIESUNF
WIDTH ACROSS FLATS1.875 INCHES NOMINAL IN
NUT STYLEHEXAGON
THREAD CLASS2B
MATERIALSTEEL OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 12
218408Interchangeable
interchangeable cross-reference
interchangeable
SSFM-100BCInterchangeable
interchangeable cross-reference
interchangeable
SSFM-100BC-15GPMInterchangeable
interchangeable cross-reference
interchangeable
3057-43Interchangeable
interchangeable cross-reference
interchangeable
9903-005300-001Interchangeable
interchangeable cross-reference
interchangeable
N38311Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 218408?
218408 is a FRAME,SEAT,VEHICULAR.
What parts can replace 218408?
There are 12 known substitutes for 218408: 218408, SSFM-100BC, SSFM-100BC-15GPM and 9 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 218408?
218408 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-021-8408. 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