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2578665-001B — WASHER,KEY

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

2578665-001B: WASHER,KEY.

The WASHER,KEY is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY OVERALL, hole_diameter: 7.300 INCHES MINIMUM AND 7.300 INCHES MINIMUM AND 7.310 INCHES MAXIMUM7.310 INCHES MAXIMUM IN, outside_diameter: 8.120 INCHES NOMINAL8.120 INCHES NOMINAL IN, style_designator: INTERNAL KEY, material_thickness: 0.318 INCHES MINIMUM AND 0.318 INCHES MINIMUM AND 0.321 INCHES MAXIMUM0.321 INCHES MAXIMUM IN, internal_key_quantity: 22. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-499-4538, 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
2578665-001B
NSN: 5310-00-499-4538
FSC: 5310 — Nuts and Washers
CAGE: 6K4C8 — GOODRICH CORPORATION (USA)
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
hole_diameter7.300 INCHES MINIMUM AND 7.300 INCHES MINIMUM AND 7.310 INCHES MAXIMUM7.310 INCHES MAXIMUM IN
outside_diameter8.120 INCHES NOMINAL8.120 INCHES NOMINAL IN
style_designatorINTERNAL KEY
material_thickness0.318 INCHES MINIMUM AND 0.318 INCHES MINIMUM AND 0.321 INCHES MAXIMUM0.321 INCHES MAXIMUM IN
internal_key_quantity22
internal_straight_key_width0.350 INCHES MINIMUM AND 0.350 INCHES MINIMUM AND 0.360 INCHES MAXIMUM0.360 INCHES MAXIMUM IN
material_document_and_classificationQQ-C-390,ALLOY G5 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
distance_from_centerline_to_top_of_internal_key3.501 INCHES MINIMUM AND 3.501 INCHES MINIMUM AND 3.511 INCHES MAXIMUM3.511 INCHES MAXIMUM IN
NSN5310-00-499-4538
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 2578665-001B · 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: 0.350 INCHES MINIMUM AND 0.350 INCHES MINIMUM AND 0.360 INCHES MAXIMUM0.360 INCHES MAXIMUM IN
•
DISTANCE FROM CENTERLINE TO TOP OF INTERNAL KEY: 3.501 INCHES MINIMUM AND 3.501 INCHES MINIMUM AND 3.511 INCHES MAXIMUM3.511 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: INTERNAL KEY
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-C-390,ALLOY G5 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
OUTSIDE DIAMETER: 8.120 INCHES NOMINAL8.120 INCHES NOMINAL IN
•
MATERIAL THICKNESS: 0.318 INCHES MINIMUM AND 0.318 INCHES MINIMUM AND 0.321 INCHES MAXIMUM0.321 INCHES MAXIMUM IN
•
TEST DATA DOCUMENT: 81349-MIL-I-6866 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.).
•
MATERIAL: COPPER ALLOY OVERALL
TECHNICAL CHARACTERISTICS
INTERNAL STRAIGHT KEY WIDTH0.350 INCHES MINIMUM AND 0.350 INCHES MINIMUM AND 0.360 INCHES MAXIMUM0.360 INCHES MAXIMUM IN
DISTANCE FROM CENTERLINE TO TOP OF INTERNAL KEY3.501 INCHES MINIMUM AND 3.501 INCHES MINIMUM AND 3.511 INCHES MAXIMUM3.511 INCHES MAXIMUM IN
STYLE DESIGNATORINTERNAL KEY
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-C-390,ALLOY G5 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER8.120 INCHES NOMINAL8.120 INCHES NOMINAL IN
MATERIAL THICKNESS0.318 INCHES MINIMUM AND 0.318 INCHES MINIMUM AND 0.321 INCHES MAXIMUM0.321 INCHES MAXIMUM IN
TEST DATA DOCUMENT81349-MIL-I-6866 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.).
MATERIALCOPPER ALLOY OVERALL
INTERNAL KEY QUANTITY22
HOLE DIAMETER7.300 INCHES MINIMUM AND 7.300 INCHES MINIMUM AND 7.310 INCHES MAXIMUM7.310 INCHES MAXIMUM IN
SUBSTITUTES & CROSS-REFERENCES 1
2578665-001AReference document
Same NSN cross-reference
Reference document — Secondary reference
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 2578665-001B?
2578665-001B is a WASHER,KEY.
What parts can replace 2578665-001B?
There is 1 known substitute for 2578665-001B: 2578665-001A. Substitute compatibility should be verified for your specific system.
What is the NSN for 2578665-001B?
2578665-001B is cataloged in the U.S. Government catalog under NSN 5310-00-499-4538. 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.