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2578839-001A — WASHER,KEY

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

2578839-001A: WASHER,KEY.

The WASHER,KEY is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, hole_diameter: 1.560 INCHES NOMINAL IN, outside_diameter: 1.780 INCHES NOMINAL IN, special_features: BOTH INTERNAL KEYS BENT 90.0 DEGREES, style_designator: INTERNAL KEY, material_thickness: 0.035 INCHES MINIMUM AND 0.045 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-476-7300, 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
2578839-001A
NSN: 5310-00-476-7300
FSC: 5310 — Nuts and Washers
CAGE: 6K4C8 — GOODRICH CORPORATION (USA)
SPECIFICATIONS
materialSTEEL OVERALL
hole_diameter1.560 INCHES NOMINAL IN
outside_diameter1.780 INCHES NOMINAL IN
special_featuresBOTH INTERNAL KEYS BENT 90.0 DEGREES
style_designatorINTERNAL KEY
material_thickness0.035 INCHES MINIMUM AND 0.045 INCHES MAXIMUM IN
internal_key_quantity2
internal_straight_key_width0.250 INCHES NOMINAL IN
material_document_and_classificationMIL-S-6758 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
distance_from_centerline_to_top_of_internal_key0.660 INCHES MINIMUM AND 0.670 INCHES MAXIMUM IN
NSN5310-00-476-7300
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 2578839-001A · 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
•
INTERNAL STRAIGHT KEY WIDTH: 0.250 INCHES NOMINAL IN
•
DISTANCE FROM CENTERLINE TO TOP OF INTERNAL KEY: 0.660 INCHES MINIMUM AND 0.670 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: INTERNAL KEY
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-S-6758 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
•
OUTSIDE DIAMETER: 1.780 INCHES NOMINAL IN
•
MATERIAL THICKNESS: 0.035 INCHES MINIMUM AND 0.045 INCHES MAXIMUM IN
•
TEST DATA DOCUMENT: 81349-MIL-I-6868 SPECIFICATION (INCLUDES ENGINEERING TYPE BULLETINS, BROCHURES,ETC., THAT REFLECT SPECIFICATION TYPE DATA IN SPECIFICATION FORMAT; EXCLUDES COMMERCIAL CATALOGS, INDUSTRY DIRECTORIES, AND SIMILAR TRADE PUBLICATIONS, REFLECTING GENERAL TYPE DATA ON CERTAIN ENVIRONMENTAL AND PERFORMANCE REQUIREMENTS AND TEST CONDITIONS THAT ARE SHOWN AS "TYPICAL", "AVERAGE", "NOMINAL", ETC.).
TECHNICAL CHARACTERISTICS
INTERNAL STRAIGHT KEY WIDTH0.250 INCHES NOMINAL IN
DISTANCE FROM CENTERLINE TO TOP OF INTERNAL KEY0.660 INCHES MINIMUM AND 0.670 INCHES MAXIMUM IN
STYLE DESIGNATORINTERNAL KEY
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-6758 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER1.780 INCHES NOMINAL IN
MATERIAL THICKNESS0.035 INCHES MINIMUM AND 0.045 INCHES MAXIMUM IN
SPECIAL FEATURESBOTH INTERNAL KEYS BENT 90.0 DEGREES
TEST DATA DOCUMENT81349-MIL-I-6868 SPECIFICATION (INCLUDES ENGINEERING TYPE BULLETINS, BROCHURES,ETC., THAT REFLECT SPECIFICATION TYPE DATA IN SPECIFICATION FORMAT; EXCLUDES COMMERCIAL CATALOGS, INDUSTRY DIRECTORIES, AND SIMILAR TRADE PUBLICATIONS, REFLECTING GENERAL TYPE DATA ON CERTAIN ENVIRONMENTAL AND PERFORMANCE REQUIREMENTS AND TEST CONDITIONS THAT ARE SHOWN AS "TYPICAL", "AVERAGE", "NOMINAL", ETC.).
MATERIALSTEEL OVERALL
INTERNAL KEY QUANTITY2
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: Terminal item — no further procurement; issued until stock is exhaustedNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 2578839-001A?
2578839-001A is a WASHER,KEY.
What is the NSN for 2578839-001A?
2578839-001A is cataloged in the U.S. Government catalog under NSN 5310-00-476-7300. 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.