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Technical Data Sheet
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90-009-1 — WASHER,FLAT

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

90-009-1: WASHER,FLAT.

The WASHER,FLAT is a the manufacturer industrial component. Key specifications include end_item_identification: THREAT EMITTE. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-663-2996, 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
90-009-1
NSN: 5340-00-663-2996
NIINs: 006632996, 016018689
FSC: 5340 — Hardware, Commercial
CAGE: 97499 — BELL TEXTRON INC (USA)
SPECIFICATIONS
end_item_identificationTHREAT EMITTE
NSN5340-00-663-2996
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 90-009-1 MFR: OEM ⚠ VERIFY BEFORE ORDERING Wrong material = failure. Viton for oil/fuel, EPDM for water/steam, Buna-N for general purpose, Silicone for food-grade. Chemical incompatibility causes swelling, brittleness, or rapid degradation ✓ BROKER TIP Durometer (hardness) affects sealing pressure tolerance. Higher Shore A = harder = higher pressure. Standard durometer is 70A — verify if application requires different hardness PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
INSIDE LENGTH: 0.750 INCHES NOMINAL IN
•
STYLE DESIGNATOR: FOOTMANS LOOP
•
PAINTED FEATURE: NOT INCLUDED
•
CENTER TO CENTER DISTANCE BETWEEN HOLES: 1.625 INCHES NOMINAL IN
•
OUTSIDE WIDTH: 0.438 INCHES NOMINAL IN
•
SURFACE TREATMENT: CADMIUM
•
MATERIAL: COPPER ALLOY
•
INSIDE HEIGHT: 0.313 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
INSIDE LENGTH0.750 INCHES NOMINAL IN
STYLE DESIGNATORFOOTMANS LOOP
PAINTED FEATURENOT INCLUDED
CENTER TO CENTER DISTANCE BETWEEN HOLES1.625 INCHES NOMINAL IN
OUTSIDE WIDTH0.438 INCHES NOMINAL IN
SURFACE TREATMENTCADMIUM
MATERIALCOPPER ALLOY
INSIDE HEIGHT0.313 INCHES NOMINAL IN
HOLE DIAMETER0.156 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES 1
555Reference 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 90-009-1?
90-009-1 is a WASHER,FLAT.
What parts can replace 90-009-1?
There is 1 known substitute for 90-009-1: 555. Substitute compatibility should be verified for your specific system.
What is the NSN for 90-009-1?
90-009-1 is cataloged in the U.S. Government catalog under NSN 5340-00-663-2996. 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.