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03A257C5A — WASHER,RECESSED

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

03A257C5A: WASHER,RECESSED.

The WASHER,RECESSED is a the manufacturer industrial component. Key specifications include material: IRON ALLOY 660 OR NICKEL ALLOY 718 OVERALL, recess_angle: 90.0 DEGREES NOMINAL, hole_diameter: 0.314 INCHES MINIMUM AND 0.318 INCHES MAXIMUM IN, recess_diameter: 0.386 INCHES MINIMUM AND 0.396 INCHES MAXIMUM IN, outside_diameter: 0.575 INCHES MINIMUM AND 0.585 INCHES MAXIMUM IN, style_designator: RECESSED. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-320-5920, 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
03A257C5A
NSN: 5310-01-320-5920
FSC: 5310 — Nuts and Washers
CAGE: 76823 — NORTHROP GRUMMAN SYSTEMS CORPORATION DBA NORTHROP GRUMMAN IS DIV NORTHROP GRUMMAN AERONAUTICS SYSTEMS (USA)
SPECIFICATIONS
materialIRON ALLOY 660 OR NICKEL ALLOY 718 OVERALL
recess_angle90.0 DEGREES NOMINAL
hole_diameter0.314 INCHES MINIMUM AND 0.318 INCHES MAXIMUM IN
recess_diameter0.386 INCHES MINIMUM AND 0.396 INCHES MAXIMUM IN
outside_diameter0.575 INCHES MINIMUM AND 0.585 INCHES MAXIMUM IN
style_designatorRECESSED
surface_treatmentALUMINUM ALLOY OVERALL
material_thickness0.057 INCHES MINIMUM AND 0.069 INCHES MAXIMUM IN
test_data_document96906-MIL-STD-6866 STANDARD (INCLUDES INDUSTRY OR ASSOCIATION STANDARDS, INDIVIDUAL MANUFACTUREER STANDARDS, ETC.).
minimum_tensile_strength180000 POUNDS PER SQUARE INCH LBS
surface_treatment_document_and_classificationAMS 4006 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
NSN5310-01-320-5920
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 03A257C5A · 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: AMS 4006 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
•
STYLE DESIGNATOR: RECESSED
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5525 ASSN STD 1ST MATERIAL RESPONSE OR AMS 5737 ASSN STD 1ST MATERIAL RESPONSE OR AMS 5596 ASSN STD 2ND MATERIAL RESPONSE OR AMS 5597 ASSN STD 2ND MATERIAL RESPONSE OR AMS 5662 ASSN STD 2ND MATERIAL RESPONSE OVERALL
•
OUTSIDE DIAMETER: 0.575 INCHES MINIMUM AND 0.585 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.057 INCHES MINIMUM AND 0.069 INCHES MAXIMUM IN
•
RECESS DIAMETER: 0.386 INCHES MINIMUM AND 0.396 INCHES MAXIMUM IN
•
SURFACE TREATMENT: ALUMINUM ALLOY OVERALL
•
MINIMUM TENSILE STRENGTH: 180000 POUNDS PER SQUARE INCH LBS
TECHNICAL CHARACTERISTICS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONAMS 4006 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
STYLE DESIGNATORRECESSED
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5525 ASSN STD 1ST MATERIAL RESPONSE OR AMS 5737 ASSN STD 1ST MATERIAL RESPONSE OR AMS 5596 ASSN STD 2ND MATERIAL RESPONSE OR AMS 5597 ASSN STD 2ND MATERIAL RESPONSE OR AMS 5662 ASSN STD 2ND MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER0.575 INCHES MINIMUM AND 0.585 INCHES MAXIMUM IN
MATERIAL THICKNESS0.057 INCHES MINIMUM AND 0.069 INCHES MAXIMUM IN
RECESS DIAMETER0.386 INCHES MINIMUM AND 0.396 INCHES MAXIMUM IN
SURFACE TREATMENTALUMINUM ALLOY OVERALL
MINIMUM TENSILE STRENGTH180000 POUNDS PER SQUARE INCH LBS
TEST DATA DOCUMENT96906-MIL-STD-6866 STANDARD (INCLUDES INDUSTRY OR ASSOCIATION STANDARDS, INDIVIDUAL MANUFACTUREER STANDARDS, ETC.).
MATERIALIRON ALLOY 660 OR NICKEL ALLOY 718 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 4
MM118C5AReference document
Same NSN cross-reference
Reference document — Secondary reference
VN948BF5CReference document
Same NSN cross-reference
Reference document — Design control — primary reference
AS19879C5ASame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
NS202860C5ASame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
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 03A257C5A?
03A257C5A is a WASHER,RECESSED.
What parts can replace 03A257C5A?
There are 4 known substitutes for 03A257C5A: MM118C5A, VN948BF5C, AS19879C5A and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 03A257C5A?
03A257C5A is cataloged in the U.S. Government catalog under NSN 5310-01-320-5920. 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.