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MAAFB4578APC25 — WASHER,KEY

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

MAAFB4578APC25: WASHER,KEY.

The WASHER,KEY is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, hole_diameter: 0.437 INCHES NOMINAL0.437 INCHES NOMINAL IN, outside_diameter: 1.250 INCHES NOMINAL1.250 INCHES NOMINAL IN, style_designator: KEYKEY, material_thickness: 0.059 INCHES NOMINAL0.059 INCHES NOMINAL IN, external_key_quantity: 11. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-272-6479, 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
MAAFB4578APC25
NSN: 5310-00-272-6479
FSC: 5310 — Nuts and Washers
CAGE: 82796 — COLTEC INDUSTRIES INC. DBA FAIRBANKS MORSE ENGINE DIV FAIRBANKS MORSE ENGINE (USA)
SPECIFICATIONS
materialSTEEL OVERALL
hole_diameter0.437 INCHES NOMINAL0.437 INCHES NOMINAL IN
outside_diameter1.250 INCHES NOMINAL1.250 INCHES NOMINAL IN
style_designatorKEYKEY
material_thickness0.059 INCHES NOMINAL0.059 INCHES NOMINAL IN
external_key_quantity11
external_prebent_key_width0.125 INCHES MAXIMUM0.125 INCHES MAXIMUM IN
external_prebent_key_length0.037 INCHES NOMINAL0.037 INCHES NOMINAL IN
material_document_and_classificationQQ-S-698 FED SPEC SINGLE MATERIAL RESPONSE OVERALLQQ-S-698 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
distance_from_centerline_to_inside_of_prebent_key0.588 INCHES NOMINAL0.588 INCHES NOMINAL IN
NSN5310-00-272-6479
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: MAAFB4578APC25 · 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
•
DISTANCE FROM CENTERLINE TO INSIDE OF PREBENT KEY: 0.588 INCHES NOMINAL0.588 INCHES NOMINAL IN
•
EXTERNAL PREBENT KEY LENGTH: 0.037 INCHES NOMINAL0.037 INCHES NOMINAL IN
•
STYLE DESIGNATOR: KEYKEY
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-698 FED SPEC SINGLE MATERIAL RESPONSE OVERALLQQ-S-698 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
OUTSIDE DIAMETER: 1.250 INCHES NOMINAL1.250 INCHES NOMINAL IN
•
MATERIAL THICKNESS: 0.059 INCHES NOMINAL0.059 INCHES NOMINAL IN
•
EXTERNAL KEY QUANTITY: 11
•
EXTERNAL PREBENT KEY WIDTH: 0.125 INCHES MAXIMUM0.125 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
DISTANCE FROM CENTERLINE TO INSIDE OF PREBENT KEY0.588 INCHES NOMINAL0.588 INCHES NOMINAL IN
EXTERNAL PREBENT KEY LENGTH0.037 INCHES NOMINAL0.037 INCHES NOMINAL IN
STYLE DESIGNATORKEYKEY
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-698 FED SPEC SINGLE MATERIAL RESPONSE OVERALLQQ-S-698 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER1.250 INCHES NOMINAL1.250 INCHES NOMINAL IN
MATERIAL THICKNESS0.059 INCHES NOMINAL0.059 INCHES NOMINAL IN
EXTERNAL KEY QUANTITY11
EXTERNAL PREBENT KEY WIDTH0.125 INCHES MAXIMUM0.125 INCHES MAXIMUM IN
MATERIALSTEEL OVERALL
HOLE DIAMETER0.437 INCHES NOMINAL0.437 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 9
9AF9B4578APC25Reference document
Same NSN cross-reference
Reference document — Secondary reference
13AF10B4578APC25Reference document
Same NSN cross-reference
Reference document — Secondary reference
MAFB4578BReference document
Same NSN cross-reference
Reference document — Secondary reference
MFAFB4578APC25Reference document
Same NSN cross-reference
Reference document — Secondary reference
NAFB2444AReference document
Same NSN cross-reference
Reference document — Design control — primary reference
MCAFB4578APC25Reference document
Same NSN cross-reference
Reference document — Secondary reference
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 MAAFB4578APC25?
MAAFB4578APC25 is a WASHER,KEY.
What parts can replace MAAFB4578APC25?
There are 9 known substitutes for MAAFB4578APC25: 9AF9B4578APC25, 13AF10B4578APC25, MAFB4578B and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MAAFB4578APC25?
MAAFB4578APC25 is cataloged in the U.S. Government catalog under NSN 5310-00-272-6479. 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.