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03A257C12A — WASHER,RECESSED

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

03A257C12A: WASHER,RECESSED.

The WASHER,RECESSED is a the manufacturer industrial component. Key specifications include material: IRON ALLOY 660 AND NICKEL ALLOY 718 OVERALL, recess_angle: 40.0 DEGREES MINIMUM AND 45.0 DEGREES MAXIMUM, hole_diameter: 0.752 INCHES MINIMUM AND 0.756 INCHES MAXIMUM IN, recess_diameter: 0.903 INCHES MINIMUM AND 0.913 INCHES MAXIMUM IN, outside_diameter: 1.518 INCHES MINIMUM AND 1.528 INCHES MAXIMUM IN, style_designator: RECESSED. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-347-8263, 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
03A257C12A
NSN: 5310-01-347-8263
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 AND NICKEL ALLOY 718 OVERALL
recess_angle40.0 DEGREES MINIMUM AND 45.0 DEGREES MAXIMUM
hole_diameter0.752 INCHES MINIMUM AND 0.756 INCHES MAXIMUM IN
recess_diameter0.903 INCHES MINIMUM AND 0.913 INCHES MAXIMUM IN
outside_diameter1.518 INCHES MINIMUM AND 1.528 INCHES MAXIMUM IN
style_designatorRECESSED
surface_treatmentALUMINUM ALLOY OVERALL
material_thickness0.099 INCHES MINIMUM AND 0.119 INCHES MAXIMUM IN
material_document_and_classificationAMS 5525 ASSN STD 1ST MATERIAL RESPONSE AND AMS 5596 ASSN STD 2ND MATERIAL RESPONSE OVERALL
NSN5310-01-347-8263
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 03A257C12A · 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
•
STYLE DESIGNATOR: RECESSED
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5525 ASSN STD 1ST MATERIAL RESPONSE AND AMS 5596 ASSN STD 2ND MATERIAL RESPONSE OVERALL
•
OUTSIDE DIAMETER: 1.518 INCHES MINIMUM AND 1.528 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.099 INCHES MINIMUM AND 0.119 INCHES MAXIMUM IN
•
RECESS DIAMETER: 0.903 INCHES MINIMUM AND 0.913 INCHES MAXIMUM IN
•
SURFACE TREATMENT: ALUMINUM ALLOY OVERALL
•
MATERIAL: IRON ALLOY 660 AND NICKEL ALLOY 718 OVERALL
•
HOLE DIAMETER: 0.752 INCHES MINIMUM AND 0.756 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
STYLE DESIGNATORRECESSED
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5525 ASSN STD 1ST MATERIAL RESPONSE AND AMS 5596 ASSN STD 2ND MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER1.518 INCHES MINIMUM AND 1.528 INCHES MAXIMUM IN
MATERIAL THICKNESS0.099 INCHES MINIMUM AND 0.119 INCHES MAXIMUM IN
RECESS DIAMETER0.903 INCHES MINIMUM AND 0.913 INCHES MAXIMUM IN
SURFACE TREATMENTALUMINUM ALLOY OVERALL
MATERIALIRON ALLOY 660 AND NICKEL ALLOY 718 OVERALL
HOLE DIAMETER0.752 INCHES MINIMUM AND 0.756 INCHES MAXIMUM IN
RECESS ANGLE40.0 DEGREES MINIMUM AND 45.0 DEGREES MAXIMUM
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
AS19879C12ASame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
VN948BF12CSame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
03A257-12CASame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
MM118C12ASame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
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 03A257C12A?
03A257C12A is a WASHER,RECESSED.
What parts can replace 03A257C12A?
There are 4 known substitutes for 03A257C12A: AS19879C12A, VN948BF12C, 03A257-12CA and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 03A257C12A?
03A257C12A is cataloged in the U.S. Government catalog under NSN 5310-01-347-8263. 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.