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90-21578-001 — PLATE,MOUNTING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

90-21578-001: PLATE,MOUNTING.

The PLATE,MOUNTING is a the manufacturer industrial component. Key specifications include shape: SPECIAL, width: 11.880 INCHES NOMINAL11.880 INCHES NOMINAL IN, length: 11.880 INCHES NOMINAL11.880 INCHES NOMINAL IN, material: GLASS FIBER, thickness: 0.250 INCHES NOMINAL0.250 INCHES NOMINAL IN, aperture_shape: ROUND. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-394-2430, 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
90-21578-001
NSN: 5340-01-394-2430
FSC: 5340 — Hardware, Commercial
CAGE: 33875 — RAYTHEON E-SYSTEMS, INC (USA)
SPECIFICATIONS
shapeSPECIAL
width11.880 INCHES NOMINAL11.880 INCHES NOMINAL IN
length11.880 INCHES NOMINAL11.880 INCHES NOMINAL IN
materialGLASS FIBER
thickness0.250 INCHES NOMINAL0.250 INCHES NOMINAL IN
aperture_shapeROUND
aperture_diameter3.390 INCHES NOMINAL IN
features_providedAPERTURE
mounting_hole_typeUNTHREADED
mounting_hole_diameter0.272 INCHES NOMINAL ALL HOLES IN
mounting_hole_quantity12
NSN5340-01-394-2430
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 90-21578-001 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
•
MOUNTING HOLE QUANTITY: 12
•
LENGTH: 11.880 INCHES NOMINAL11.880 INCHES NOMINAL IN
•
MOUNTING HOLE DIAMETER: 0.272 INCHES NOMINAL ALL HOLES IN
•
SHAPE: SPECIAL
•
APERTURE DIAMETER: 3.390 INCHES NOMINAL IN
•
FEATURES PROVIDED: APERTURE
•
WIDTH: 11.880 INCHES NOMINAL11.880 INCHES NOMINAL IN
•
MATERIAL: GLASS FIBER
TECHNICAL CHARACTERISTICS
MOUNTING HOLE QUANTITY12
LENGTH11.880 INCHES NOMINAL11.880 INCHES NOMINAL IN
MOUNTING HOLE DIAMETER0.272 INCHES NOMINAL ALL HOLES IN
SHAPESPECIAL
APERTURE DIAMETER3.390 INCHES NOMINAL IN
FEATURES PROVIDEDAPERTURE
WIDTH11.880 INCHES NOMINAL11.880 INCHES NOMINAL IN
MATERIALGLASS FIBER
THICKNESS0.250 INCHES NOMINAL0.250 INCHES NOMINAL IN
MOUNTING HOLE TYPEUNTHREADED
OTHER ITEMS IN FSC 5340 — Hardware, Commercial
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5340-00-000-0068 5340-00-000-0132 5340-00-000-8150 5340-00-001-1251 5340-00-001-1264 5340-00-001-1265 5340-00-001-1266 5340-00-001-1275
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

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 90-21578-001?
90-21578-001 is a PLATE,MOUNTING.
What is the NSN for 90-21578-001?
90-21578-001 is cataloged in the U.S. Government catalog under NSN 5340-01-394-2430. 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.