PartsTable
Technical Data Sheet

347/21978 — WASHER,FLAT

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

347/21978: WASHER,FLAT.

The WASHER,FLAT is a the manufacturer industrial component. Key specifications include special_features: NEXT HIGHER ASSEMBLY ENGINE MOUNTINGS 9802/9910 U1-8-1, end_item_identification: 2420-01-535-4061 TRACTOR, WHEELED INDUSTRIAL, part_name_assigned_by_controlling_agency: WASHER, FRONT ENGINE MOUNT UPPER. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-550-3700, 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
347/21978
NSN: 5310-01-550-3700
FSC: 5310 — Nuts and Washers
CAGE: 0JKF0 — JCB INC. (USA)
SPECIFICATIONS
special_featuresNEXT HIGHER ASSEMBLY ENGINE MOUNTINGS 9802/9910 U1-8-1
end_item_identification2420-01-535-4061 TRACTOR, WHEELED INDUSTRIAL
part_name_assigned_by_controlling_agencyWASHER, FRONT ENGINE MOUNT UPPER
NSN5310-01-550-3700
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 347/21978 · 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
TECHNICAL CHARACTERISTICS
SPECIAL FEATURESNEXT HIGHER ASSEMBLY ENGINE MOUNTINGS 9802/9910 U1-8-1
PART NAME ASSIGNED BY CONTROLLING AGENCYWASHER, FRONT ENGINE MOUNT UPPER
END ITEM IDENTIFICATION2420-01-535-4061 TRACTOR, WHEELED INDUSTRIAL
OTHER ITEMS IN FSC 5310 — Nuts and Washers
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5310-00-000-0040 5310-00-000-0077 5310-00-000-0079 5310-00-000-1146 5310-00-000-3815 5310-00-000-4532 5310-00-000-4540
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 347/21978?
347/21978 is a WASHER,FLAT.
What is the NSN for 347/21978?
347/21978 is cataloged in the U.S. Government catalog under NSN 5310-01-550-3700. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.