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4250818 — WASHER,LOCK

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

4250818: WASHER,LOCK.

The WASHER,LOCK is a the manufacturer industrial component. Key specifications include hole_diameter: 0.252 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN, outside_diameter: 0.487 INCHES NOMINAL IN, style_designator: SPLIT HELICAL-RIGHT HAND, material_thickness: 0.062 INCHES MINIMUM AND 0.072 INCHES MAXIMUM IN, end_item_identification: 4210-01-622-0440; TRUCK, FIRE FIGHTING, part_name_assigned_by_controlling_agency: WASHER, LOCKING, SPLIT .25X.49X.06 ZCHDN. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-661-3853, 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
4250818
NSN: 5310-01-661-3853
FSC: 5310 — Nuts and Washers
CAGE: 75Q65 — OSHKOSH DEFENSE LLC (USA)
SPECIFICATIONS
hole_diameter0.252 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN
outside_diameter0.487 INCHES NOMINAL IN
style_designatorSPLIT HELICAL-RIGHT HAND
material_thickness0.062 INCHES MINIMUM AND 0.072 INCHES MAXIMUM IN
end_item_identification4210-01-622-0440; TRUCK, FIRE FIGHTING
part_name_assigned_by_controlling_agencyWASHER, LOCKING, SPLIT .25X.49X.06 ZCHDN
surface_treatment_document_and_classificationFE/ZN 3AT PER ASTM F1941 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
NSN5310-01-661-3853
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 4250818 · 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
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: FE/ZN 3AT PER ASTM F1941 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
•
STYLE DESIGNATOR: SPLIT HELICAL-RIGHT HAND
•
OUTSIDE DIAMETER: 0.487 INCHES NOMINAL IN
•
MATERIAL THICKNESS: 0.062 INCHES MINIMUM AND 0.072 INCHES MAXIMUM IN
•
HOLE DIAMETER: 0.252 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONFE/ZN 3AT PER ASTM F1941 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
STYLE DESIGNATORSPLIT HELICAL-RIGHT HAND
OUTSIDE DIAMETER0.487 INCHES NOMINAL IN
MATERIAL THICKNESS0.062 INCHES MINIMUM AND 0.072 INCHES MAXIMUM IN
PART NAME ASSIGNED BY CONTROLLING AGENCYWASHER, LOCKING, SPLIT .25X.49X.06 ZCHDN
END ITEM IDENTIFICATION4210-01-622-0440; TRUCK, FIRE FIGHTING
HOLE DIAMETER0.252 INCHES MINIMUM AND 0.260 INCHES MAXIMUM 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

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 4250818?
4250818 is a WASHER,LOCK.
What is the NSN for 4250818?
4250818 is cataloged in the U.S. Government catalog under NSN 5310-01-661-3853. 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.