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Technical Data Sheet
PartsTable / O-RING / ST1946-018
ST1946-018 ✓ Verified by PartsTable
— · ORING SEAL
WHAT YOU NEED TO KNOW
Material determines chemical compatibility Standard durometer is 70 Shore A
Wrong material = catastrophic seal failure
PRODUCT OVERVIEW

The PACKING,PREFORMED is a the manufacturer industrial component. Key specifications include special_features: ITEM IS UNIQUE AND CRITICAL TO THE F119 ENGINE, end_item_identification: F119-PW-100-ENGINE F-22 RAPTOR, criticality_code_justification: FEAT. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5331-00-166-0994, 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
ST1946-018
NSN: 5331-00-166-0994
FSC: 5331 — O-RING
CAGE: 77445 — RTX CORPORATION DBA PRATT & WHITNEY DIV PRATT &WHITNEY (USA)
SPECIFICATIONS
special_featuresITEM IS UNIQUE AND CRITICAL TO THE F119 ENGINE
end_item_identificationF119-PW-100-ENGINE F-22 RAPTOR
criticality_code_justificationFEAT
NSN5331-00-166-0994
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: ST1946-018 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
•
ELONGATION PERCENTAGE: 125 MAXIMUM
•
MATERIAL: RUBBER FLUOROCARBON CLASS FPM
•
CROSS-SECTIONAL HEIGHT: 0.067 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN
•
CENTER HOLE DIAMETER: 0.730 INCHES MINIMUM AND 0.748 INCHES MAXIMUM IN
•
OUTSIDE DIAMETER: 0.864 INCHES MINIMUM AND 0.894 INCHES MAXIMUM IN
•
HARDNESS RATING: 75.0 SHORE DUROMETER A NOMINAL
TECHNICAL CHARACTERISTICS (FLIS)
ELONGATION PERCENTAGE125 MAXIMUM
MATERIALRUBBER FLUOROCARBON CLASS FPM
CROSS-SECTIONAL HEIGHT0.067 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN
CENTER HOLE DIAMETER0.730 INCHES MINIMUM AND 0.748 INCHES MAXIMUM IN
OUTSIDE DIAMETER0.864 INCHES MINIMUM AND 0.894 INCHES MAXIMUM IN
HARDNESS RATING75.0 SHORE DUROMETER A NOMINAL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 26
91624528Interchangeable
interchangeable cross-reference
interchangeable
1355-115Interchangeable
interchangeable cross-reference
interchangeable
2-018V747-75Interchangeable
interchangeable cross-reference
interchangeable
8018Interchangeable
interchangeable cross-reference
interchangeable
127-189-018Interchangeable
interchangeable cross-reference
interchangeable
GD00990186Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is ST1946-018?
ST1946-018 is a PACKING,PREFORMED.
What parts can replace ST1946-018?
There are 26 known substitutes for ST1946-018: 91624528, 1355-115, 2-018V747-75 and 23 more. Substitute compatibility should be verified for your specific system.
Is ST1946-018 still available?
ST1946-018 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026