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ST1946-156 — O-RING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

ST1946-156: O-RING.

The O-RING is a the manufacturer industrial component. Key specifications include special_features: FAA CERTIFIED, end_item_identification: KC-46 TANKER, part_name_assigned_by_controlling_agency: PACKING PREFORMED. This part is cataloged in the U.S.

Government catalog under NSN 5331-01-648-5633, 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
ST1946-156
NSN: 5331-01-648-5633
FSC: 5331 — O-ring
CAGE: 77445 — RTX CORPORATION DBA PRATT & WHITNEY DIV PRATT &WHITNEY (USA)
SPECIFICATIONS
special_featuresFAA CERTIFIED
end_item_identificationKC-46 TANKER
part_name_assigned_by_controlling_agencyPACKING PREFORMED
NSN5331-01-648-5633
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: ST1946-156 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
TECHNICAL CHARACTERISTICS
SPECIAL FEATURESFAA CERTIFIED
PART NAME ASSIGNED BY CONTROLLING AGENCYPACKING PREFORMED
END ITEM IDENTIFICATIONKC-46 TANKER
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

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 ST1946-156?
ST1946-156 is a O-RING.
What is the NSN for ST1946-156?
ST1946-156 is cataloged in the U.S. Government catalog under NSN 5331-01-648-5633. 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.