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ST1946-018 — PACKING,PREFORMED

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

ST1946-018: PACKING,PREFORMED.

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 U.S.

Government catalog 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
NIINs: 001660994, 016869339
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
•
CROSS-SECTIONAL HEIGHT: 0.067 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN
•
OUTSIDE DIAMETER: 0.864 INCHES MINIMUM AND 0.894 INCHES MAXIMUM IN
•
HARDNESS RATING: 75.0 SHORE DUROMETER A NOMINAL
•
ELONGATION PERCENTAGE: 125 MAXIMUM
•
CENTER HOLE DIAMETER: 0.730 INCHES MINIMUM AND 0.748 INCHES MAXIMUM IN
•
MATERIAL: RUBBER FLUOROCARBON CLASS FPM
TECHNICAL CHARACTERISTICS
CROSS-SECTIONAL HEIGHT0.067 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN
OUTSIDE DIAMETER0.864 INCHES MINIMUM AND 0.894 INCHES MAXIMUM IN
HARDNESS RATING75.0 SHORE DUROMETER A NOMINAL
ELONGATION PERCENTAGE125 MAXIMUM
CENTER HOLE DIAMETER0.730 INCHES MINIMUM AND 0.748 INCHES MAXIMUM IN
MATERIALRUBBER FLUOROCARBON CLASS FPM
SUBSTITUTES & CROSS-REFERENCES 8
M83248/1-018Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
ASC1442296Reference document
Same NSN cross-reference
Reference document — Secondary reference
F3C10272-5Reference document
Same NSN cross-reference
Reference document — Secondary reference
2-018 V747-75Reference document
Same NSN cross-reference
Reference document — Secondary reference
04018-514A0Reference document
Same NSN cross-reference
Reference document — Secondary reference
10067993Reference document
Same NSN cross-reference
Reference document — Informative reference only
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
No demilitarization required
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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 8 known substitutes for ST1946-018: M83248/1-018, ASC1442296, F3C10272-5 and 5 more. Substitute compatibility should be verified for your specific system.
What is the NSN for ST1946-018?
ST1946-018 is cataloged in the U.S. Government catalog under NSN 5331-00-166-0994. 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.