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381721R91 — SEAL,PLAIN ENCASED

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

381721R91: SEAL,PLAIN ENCASED.

The SEAL,PLAIN ENCASED is a the manufacturer industrial component. This part is cataloged in the U.S. Government catalog under NSN 5330-00-833-2350, 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
381721R91
NSN: 5330-00-833-2350
FSC: 5330 — Packing and Gasket Materials
CAGE: 29930 — INTERNATIONAL HARVESTER CO AGRICULTURAL EQUIPMENT DIV (USA)
SPECIFICATIONS
Part Number381721R91
NSN5330-00-833-2350
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 381721R91 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
SUBSTITUTES & CROSS-REFERENCES 7
31-15-4173-2Reference document
Same NSN cross-reference
Reference document — Vendor item drawing reference
9878Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
4068268Reference document
Same NSN cross-reference
Reference document — Secondary reference
A4068268Reference document
Same NSN cross-reference
Reference document — Secondary reference
043129Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
2J8333Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 381721R91?
381721R91 is a SEAL,PLAIN ENCASED.
What parts can replace 381721R91?
There are 7 known substitutes for 381721R91: 31-15-4173-2, 9878, 4068268 and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 381721R91?
381721R91 is cataloged in the U.S. Government catalog under NSN 5330-00-833-2350. 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.