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Technical Data Sheet
PartsTable / O-RING / P158821 IT.SEQ.18
P158821 IT.SEQ.18 ✓ 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 P158821 IT.SEQ.18 is a the manufacturer industrial component. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5331-00-584-1186, 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
P158821 IT.SEQ.18
NSN: 5331-00-584-1186
FSC: 5331 — O-RING
CAGE: 82796 — COLTEC INDUSTRIES INC. DBA FAIRBANKS MORSE ENGINE DIV FAIRBANKS MORSE ENGINE (USA)
SPECIFICATIONS
Part NumberP158821 IT.SEQ.18
NSN5331-00-584-1186
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: P158821 IT.SEQ.18 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
•
CENTER HOLE DIAMETER: 2.215 INCHES MINIMUM AND 2.235 INCHES MAXIMUM IN
•
MATERIAL: RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR
•
CROSS-SECTIONAL HEIGHT: 0.205 INCHES MINIMUM AND 0.215 INCHES MAXIMUM IN
•
OUTSIDE DIAMETER: 2.617 INCHES MINIMUM AND 2.673 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
CENTER HOLE DIAMETER2.215 INCHES MINIMUM AND 2.235 INCHES MAXIMUM IN
MATERIALRUBBER BUTADIENE-ACRYLONITRILE CLASS NBR
CROSS-SECTIONAL HEIGHT0.205 INCHES MINIMUM AND 0.215 INCHES MAXIMUM IN
OUTSIDE DIAMETER2.617 INCHES MINIMUM AND 2.673 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
571-6202-1301776REVABLINE1077Interchangeable
interchangeable cross-reference
interchangeable
25F243Interchangeable
interchangeable cross-reference
interchangeable
11-331Interchangeable
interchangeable cross-reference
interchangeable
3666880Interchangeable
interchangeable cross-reference
interchangeable
7377331Interchangeable
interchangeable cross-reference
interchangeable
AMS-P-813461/1Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is P158821 IT.SEQ.18?
P158821 IT.SEQ.18 is a P158821 IT.SEQ.18.
What parts can replace P158821 IT.SEQ.18?
There are 15 known substitutes for P158821 IT.SEQ.18: 571-6202-1301776REVABLINE1077, 25F243, 11-331 and 12 more. Substitute compatibility should be verified for your specific system.
Is P158821 IT.SEQ.18 still available?
P158821 IT.SEQ.18 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