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Technical Data Sheet
21-90-33 ✓ Verified by PartsTable
· MRO · MRO_GENERAL
WHAT YOU NEED TO KNOW
Material determines chemical compatibility Standard durometer is 70 Shore A
Wrong material = catastrophic seal failure
PRODUCT OVERVIEW

DISCHARGER,ELECTROSTATIC,AIRCRAF. Key specifications include special_features: LENGTH IS 6.9 INCHES DIAMETER .250 INCHES HAS A YELLOW BAND TO VISUALLYINDICATE FAIL POINT IN, center_hole_diameter: 0.313 INCHES NOMINAL IN, end_item_identification: F16 A/B/C/D. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5331-01-129-0345, 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
MRO MRO_GENERAL 21-90-33
NSN: 5331-01-129-0345
FSC: 5331 — O-RING
CAGE: 31361 — WOODWARD, INC. (USA)
SPECIFICATIONS
special_featuresLENGTH IS 6.9 INCHES DIAMETER .250 INCHES HAS A YELLOW BAND TO VISUALLYINDICATE FAIL POINT IN
center_hole_diameter0.313 INCHES NOMINAL IN
end_item_identificationF16 A/B/C/D
NSN5331-01-129-0345
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 21-90-33 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
CENTER HOLE DIAMETER: 0.313 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
CENTER HOLE DIAMETER0.313 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 4
5920PL2169866Interchangeable
interchangeable cross-reference
interchangeable
5920PL1634131Interchangeable
interchangeable cross-reference
interchangeable
2-33SCYX-1Interchangeable
interchangeable cross-reference
interchangeable
36681-10Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 21-90-33?
21-90-33 is a DISCHARGER,ELECTROSTATIC,AIRCRAF. It is classified as a MRO (MRO_GENERAL).
What parts can replace 21-90-33?
There are 4 known substitutes for 21-90-33: 5920PL2169866, 5920PL1634131, 2-33SCYX-1 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 21-90-33?
21-90-33 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5331-01-129-0345. This indicates validated use in U.S. government and defense supply chains.
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