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2498571 — WASHER,SHOULDERED AND RECESSED

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

2498571: WASHER,SHOULDERED AND RECESSED.

The WASHER,SHOULDERED AND RECESSED is a the manufacturer industrial component. Key specifications include material: STEEL COMP 4140H OVERALL, recess_angle: 90.0 DEGREES NOMINAL, hole_diameter: 0.4385 INCHES MINIMUM AND 0.4435 INCHES MAXIMUM IN, hardness_rating: 27.0 ROCKWELL C MINIMUM AND 35.0 ROCKWELL C MAXIMUM, recess_diameter: 0.4635 INCHES MINIMUM AND 0.4785 INCHES MAXIMUM IN, shoulder_height: 0.111 INCHES MINIMUM AND 0.123 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-031-8410, 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
2498571
NSN: 5310-01-031-8410
FSC: 5310 — Nuts and Washers
CAGE: 10001 — NAVAIR AND NAVSEA MANAGED ORIGINAL DESIGN ACTIVITY DWG NOT MATERIAL/PARTS SUPPLIER (USA)
SPECIFICATIONS
materialSTEEL COMP 4140H OVERALL
recess_angle90.0 DEGREES NOMINAL
hole_diameter0.4385 INCHES MINIMUM AND 0.4435 INCHES MAXIMUM IN
hardness_rating27.0 ROCKWELL C MINIMUM AND 35.0 ROCKWELL C MAXIMUM
recess_diameter0.4635 INCHES MINIMUM AND 0.4785 INCHES MAXIMUM IN
shoulder_height0.111 INCHES MINIMUM AND 0.123 INCHES MAXIMUM IN
outside_diameter1.115 INCHES NOMINAL IN
special_featuresSHOULDER BEVELED ON A 30 DEG ANGLE
style_designatorSHOULDERED AND RECESSED
surface_treatmentOXIDE FILM OVERALL
material_thickness0.128 INCHES MINIMUM AND 0.138 INCHES MAXIMUM IN
departure_from_cited_documentAS MODIFIED BY SPECIAL QUALITY CONTROL TESTING FOR MK 48 TORPEDO
NSN5310-01-031-8410
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 2498571 · 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: MIL-C-13924,CLASS 1 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
•
SHOULDER HEIGHT: 0.111 INCHES MINIMUM AND 0.123 INCHES MAXIMUM IN
•
HARDNESS RATING: 27.0 ROCKWELL C MINIMUM AND 35.0 ROCKWELL C MAXIMUM
•
CRITICALITY CODE JUSTIFICATION: ZZZW
•
STYLE DESIGNATOR: SHOULDERED AND RECESSED
•
OUTSIDE DIAMETER: 1.115 INCHES NOMINAL IN
•
MATERIAL THICKNESS: 0.128 INCHES MINIMUM AND 0.138 INCHES MAXIMUM IN
•
DEPARTURE FROM CITED DOCUMENT: AS MODIFIED BY SPECIAL QUALITY CONTROL TESTING FOR MK 48 TORPEDO
TECHNICAL CHARACTERISTICS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-C-13924,CLASS 1 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
SHOULDER HEIGHT0.111 INCHES MINIMUM AND 0.123 INCHES MAXIMUM IN
HARDNESS RATING27.0 ROCKWELL C MINIMUM AND 35.0 ROCKWELL C MAXIMUM
CRITICALITY CODE JUSTIFICATIONZZZW
STYLE DESIGNATORSHOULDERED AND RECESSED
OUTSIDE DIAMETER1.115 INCHES NOMINAL IN
MATERIAL THICKNESS0.128 INCHES MINIMUM AND 0.138 INCHES MAXIMUM IN
DEPARTURE FROM CITED DOCUMENTAS MODIFIED BY SPECIAL QUALITY CONTROL TESTING FOR MK 48 TORPEDO
RECESS DIAMETER0.4635 INCHES MINIMUM AND 0.4785 INCHES MAXIMUM IN
COLORBLACK OVERALL
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: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 2498571?
2498571 is a WASHER,SHOULDERED AND RECESSED.
What is the NSN for 2498571?
2498571 is cataloged in the U.S. Government catalog under NSN 5310-01-031-8410. 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.