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AS32990-4A — WASHER,FLAT

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

AS32990-4A: WASHER,FLAT.

The WASHER,FLAT is a the manufacturer industrial component. Key specifications include material: NICKEL ALLOY 718 OVERALL, thickness: 0.057 INCHES MINIMUM AND 0.069 INCHES MAXIMUM IN, hole_diameter: 0.252 INCHES MINIMUM AND 0.255 INCHES MAXIMUM IN, hardness_rating: 36.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM, overall_diameter: 0.460 INCHES MINIMUM AND 0.470 INCHES MAXIMUM IN, surface_treatment: ALUMINUM ALLOY OVERALL. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-439-2684, 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
AS32990-4A
NSN: 5310-01-439-2684
FSC: 5310 — Nuts and Washers
CAGE: 10630 — ANILLO INDUSTRIES LLC (USA)
SPECIFICATIONS
materialNICKEL ALLOY 718 OVERALL
thickness0.057 INCHES MINIMUM AND 0.069 INCHES MAXIMUM IN
hole_diameter0.252 INCHES MINIMUM AND 0.255 INCHES MAXIMUM IN
hardness_rating36.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM
overall_diameter0.460 INCHES MINIMUM AND 0.470 INCHES MAXIMUM IN
surface_treatmentALUMINUM ALLOY OVERALL
peripheral_shape_styleROUND
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
material_document_and_classificationAMS5596 ASSN STD SINGLE MATERIAL RESPONSE OR AMS5597 ASSN STD SINGLE MATERIAL RESPONSE OR AMS5662 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NSN5310-01-439-2684
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: AS32990-4A · 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
•
OVERALL DIAMETER: 0.460 INCHES MINIMUM AND 0.470 INCHES MAXIMUM IN
•
HARDNESS RATING: 36.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS5596 ASSN STD SINGLE MATERIAL RESPONSE OR AMS5597 ASSN STD SINGLE MATERIAL RESPONSE OR AMS5662 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
SURFACE TREATMENT: ALUMINUM ALLOY OVERALL
•
PERIPHERAL SHAPE STYLE: ROUND
•
MATERIAL: NICKEL ALLOY 718 OVERALL
•
CENTER HOLE SHAPE STYLE: ROUND
TECHNICAL CHARACTERISTICS
OVERALL DIAMETER0.460 INCHES MINIMUM AND 0.470 INCHES MAXIMUM IN
HARDNESS RATING36.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM
MATERIAL DOCUMENT AND CLASSIFICATIONAMS5596 ASSN STD SINGLE MATERIAL RESPONSE OR AMS5597 ASSN STD SINGLE MATERIAL RESPONSE OR AMS5662 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
SURFACE TREATMENTALUMINUM ALLOY OVERALL
PERIPHERAL SHAPE STYLEROUND
MATERIALNICKEL ALLOY 718 OVERALL
CENTER HOLE SHAPE STYLEROUND
HOLE DIAMETER0.252 INCHES MINIMUM AND 0.255 INCHES MAXIMUM IN
THICKNESS0.057 INCHES MINIMUM AND 0.069 INCHES MAXIMUM 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 4
03A280-4ASame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
MM891-4ASame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
NS202859-4ASame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
VN948YNP4-ASame 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 AS32990-4A?
AS32990-4A is a WASHER,FLAT.
What parts can replace AS32990-4A?
There are 4 known substitutes for AS32990-4A: 03A280-4A, MM891-4A, NS202859-4A and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for AS32990-4A?
AS32990-4A is cataloged in the U.S. Government catalog under NSN 5310-01-439-2684. 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.