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ST7M258H550 — O-RING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

ST7M258H550: O-RING.

The O-RING is a the manufacturer industrial component. Key specifications include temp_rating: -65.0 FAHRENHEIT AND 600.0 FAHRENHEIT DEGF, center_hole_diameter: 5.470 INCHES MINIMUM AND 5.500 INCHES MAXIMUM IN, cross-sectional_height: 0.260 INCHES MINIMUM AND 0.280 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5331-01-395-4646, 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
ST7M258H550
NSN: 5331-01-395-4646
FSC: 5331 — O-ring
CAGE: 60980 — MEGGITT OREGON INC DBA MEGGITT OREGON INC DIV MEGGITT POLYMERS & COMPOSITES (USA)
SPECIFICATIONS
temp_rating-65.0 FAHRENHEIT AND 600.0 FAHRENHEIT DEGF
center_hole_diameter5.470 INCHES MINIMUM AND 5.500 INCHES MAXIMUM IN
cross-sectional_height0.260 INCHES MINIMUM AND 0.280 INCHES MAXIMUM IN
NSN5331-01-395-4646
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: ST7M258H550 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
•
TEMP RATING: -65.0 FAHRENHEIT AND 600.0 FAHRENHEIT DEGF
•
CROSS-SECTIONAL HEIGHT: 0.260 INCHES MINIMUM AND 0.280 INCHES MAXIMUM IN
•
CENTER HOLE DIAMETER: 5.470 INCHES MINIMUM AND 5.500 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
TEMP RATING-65.0 FAHRENHEIT AND 600.0 FAHRENHEIT DEGF
CROSS-SECTIONAL HEIGHT0.260 INCHES MINIMUM AND 0.280 INCHES MAXIMUM IN
CENTER HOLE DIAMETER5.470 INCHES MINIMUM AND 5.500 INCHES MAXIMUM IN
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 1
600-550Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is ST7M258H550?
ST7M258H550 is a O-RING.
What parts can replace ST7M258H550?
There is 1 known substitute for ST7M258H550: 600-550. Substitute compatibility should be verified for your specific system.
What is the NSN for ST7M258H550?
ST7M258H550 is cataloged in the U.S. Government catalog under NSN 5331-01-395-4646. 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.