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21TD221 — O-RING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

21TD221: O-RING.

The O-RING is a the manufacturer industrial component. Key specifications include material: RUBBER SYNTHETIC, center_hole_diameter: 19.445 INCHES MINIMUM AND 19.505 INCHES MAXIMUM IN, cross-sectional_height: 0.205 INCHES MINIMUM AND 0.215 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5331-00-240-8475, 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
21TD221
NSN: 5331-00-240-8475
FSC: 5331 — O-ring
CAGE: 75Q65 — OSHKOSH DEFENSE LLC (USA)
SPECIFICATIONS
materialRUBBER SYNTHETIC
center_hole_diameter19.445 INCHES MINIMUM AND 19.505 INCHES MAXIMUM IN
cross-sectional_height0.205 INCHES MINIMUM AND 0.215 INCHES MAXIMUM IN
NSN5331-00-240-8475
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 21TD221 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
•
CROSS-SECTIONAL HEIGHT: 0.205 INCHES MINIMUM AND 0.215 INCHES MAXIMUM IN
•
CENTER HOLE DIAMETER: 19.445 INCHES MINIMUM AND 19.505 INCHES MAXIMUM IN
•
MATERIAL: RUBBER SYNTHETIC
TECHNICAL CHARACTERISTICS
CROSS-SECTIONAL HEIGHT0.205 INCHES MINIMUM AND 0.215 INCHES MAXIMUM IN
CENTER HOLE DIAMETER19.445 INCHES MINIMUM AND 19.505 INCHES MAXIMUM IN
MATERIALRUBBER SYNTHETIC
OTHER ITEMS IN FSC 5331 — O-ring
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5331-00-001-1971 5331-00-001-1979 5331-00-001-3904 5331-00-001-3905 5331-00-001-3906 5331-00-001-3908 5331-00-001-3923 5331-00-001-3924
SUBSTITUTES & CROSS-REFERENCES 1
A2916CSReference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 21TD221?
21TD221 is a O-RING.
What parts can replace 21TD221?
There is 1 known substitute for 21TD221: A2916CS. Substitute compatibility should be verified for your specific system.
What is the NSN for 21TD221?
21TD221 is cataloged in the U.S. Government catalog under NSN 5331-00-240-8475. 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.