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78897 — DIAPHRAGM,ACTUATOR VALVE,SPECIAL

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

78897: DIAPHRAGM,ACTUATOR VALVE,SPECIAL.

DIAPHRAGM,ACTUATOR VALVE,SPECIAL. Key specifications include material: PLASTIC, bead_diameter: 1.500 INCHES NOMINAL IN, outside_diameter: 1.850 INCHES NOMINAL IN, style_designator: SPECIAL SHAPED, material_thickness: 0.013 INCHES MINIMUM AND 0.017 INCHES MAXIMUM IN, center_hole_diameter: 0.185 INCHES MINIMUM AND 0.195 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5330-00-086-4623, 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
78897
NSN: 5330-00-086-4623
NIINs: 000864623, 011269942
FSC: 5330 — Packing and Gasket Materials
CAGE: 14541 — COOPER MACHINERY SERVICES LLC (USA)
SPECIFICATIONS
materialPLASTIC
bead_diameter1.500 INCHES NOMINAL IN
outside_diameter1.850 INCHES NOMINAL IN
style_designatorSPECIAL SHAPED
material_thickness0.013 INCHES MINIMUM AND 0.017 INCHES MAXIMUM IN
center_hole_diameter0.185 INCHES MINIMUM AND 0.195 INCHES MAXIMUM IN
NSN5330-00-086-4623
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 78897 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 FEATURESIRREGULAR SHAPE STYLE
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Terminal item — stock exhausted; no further procurementNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 78897?
78897 is a DIAPHRAGM,ACTUATOR VALVE,SPECIAL.
What is the NSN for 78897?
78897 is cataloged in the U.S. Government catalog under NSN 5330-00-086-4623. 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.