PartsTable
Technical Data Sheet

678287-1/4 — WASHER,SEAL

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

678287-1/4: WASHER,SEAL.

The WASHER,SEAL is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING AND RUBBER FLUOROSILICONE CLASS FQ OVERALL, hole_diameter: 0.250 INCHES NOMINAL0.250 INCHES NOMINAL IN, overall_height: 0.045 INCHES MINIMUM AND 0.045 INCHES MINIMUM AND 0.055 INCHES MAXIMUM0.055 INCHES MAXIMUM IN, outside_diameter: 0.552 INCHES MINIMUM AND 0.552 INCHES MINIMUM AND 0.572 INCHES MAXIMUM0.572 INCHES MAXIMUM IN, style_designator: CONCAVE, end_item_identification: 14100108763431410010876343. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-471-6196, 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
678287-1/4
NSN: 5310-01-471-6196
FSC: 5310 — Nuts and Washers
CAGE: 83259 — PARKER-HANNIFIN CORPORATION DBA PNEUTRONICS DIV COMPOSITE SEALING SYSTEMS DIVISION (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING AND RUBBER FLUOROSILICONE CLASS FQ OVERALL
hole_diameter0.250 INCHES NOMINAL0.250 INCHES NOMINAL IN
overall_height0.045 INCHES MINIMUM AND 0.045 INCHES MINIMUM AND 0.055 INCHES MAXIMUM0.055 INCHES MAXIMUM IN
outside_diameter0.552 INCHES MINIMUM AND 0.552 INCHES MINIMUM AND 0.572 INCHES MAXIMUM0.572 INCHES MAXIMUM IN
style_designatorCONCAVE
end_item_identification14100108763431410010876343
NSN5310-01-471-6196
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 678287-1/4 · 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
•
STYLE DESIGNATOR: CONCAVE
•
OUTSIDE DIAMETER: 0.552 INCHES MINIMUM AND 0.552 INCHES MINIMUM AND 0.572 INCHES MAXIMUM0.572 INCHES MAXIMUM IN
•
MATERIAL: STEEL CORROSION RESISTING AND RUBBER FLUOROSILICONE CLASS FQ OVERALL
•
HOLE DIAMETER: 0.250 INCHES NOMINAL0.250 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.045 INCHES MINIMUM AND 0.045 INCHES MINIMUM AND 0.055 INCHES MAXIMUM0.055 INCHES MAXIMUM IN
STYLE DESIGNATORCONCAVE
OUTSIDE DIAMETER0.552 INCHES MINIMUM AND 0.552 INCHES MINIMUM AND 0.572 INCHES MAXIMUM0.572 INCHES MAXIMUM IN
END ITEM IDENTIFICATION14100108763431410010876343
MATERIALSTEEL CORROSION RESISTING AND RUBBER FLUOROSILICONE CLASS FQ OVERALL
HOLE DIAMETER0.250 INCHES NOMINAL0.250 INCHES NOMINAL IN
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 1
11479028-3Reference document
Same NSN cross-reference
Reference document — Secondary reference
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 678287-1/4?
678287-1/4 is a WASHER,SEAL.
What parts can replace 678287-1/4?
There is 1 known substitute for 678287-1/4: 11479028-3. Substitute compatibility should be verified for your specific system.
What is the NSN for 678287-1/4?
678287-1/4 is cataloged in the U.S. Government catalog under NSN 5310-01-471-6196. 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.