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AD857 — ADAPTER,DUCT FAN

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

AD857: ADAPTER,DUCT FAN.

The ADAPTER,DUCT FAN is a the manufacturer thermal management component critical for maintaining optimal operating temperatures in enterprise hardware. Key specifications include general_characteristics_item_description: NYLON FABRIC,6.750 IN. 1D,2.500 IN.

MIN,2.750 IN. MAX LG IN. This part is cataloged in the U.S.

Government catalog under NSN 5330-00-629-5065, 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
AD857
NSN: 5330-00-629-5065
NIINs: 006295065, 008887921
FSC: 5330 — Packing and Gasket Materials
CAGE: 97947 — LISTER PETTER AMERICAS INCORPORATED (USA)
SPECIFICATIONS
general_characteristics_item_descriptionNYLON FABRIC,6.750 IN. 1D,2.500 IN. MIN,2.750 IN. MAX LG IN
NSN5330-00-629-5065
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: AD857 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 THICKNESS: 0.250 INCHES NOMINAL IN
•
STYLE DESIGNATOR: CIRCULAR
•
CROSS-SECTIONAL SHAPE STYLE: SOLID SINGLE OR COMPOSITION
•
APERTURE DIAMETER: 3.688 INCHES NOMINAL IN
•
MATERIAL: RUBBER OVERALL
TYPICAL APPLICATIONS
  • Server thermal management and cooling
  • Hot-swap fan replacement in production environments
  • Redundant cooling for high-availability systems
TECHNICAL CHARACTERISTICS
CROSS-SECTIONAL THICKNESS0.250 INCHES NOMINAL IN
STYLE DESIGNATORCIRCULAR
CROSS-SECTIONAL SHAPE STYLESOLID SINGLE OR COMPOSITION
APERTURE DIAMETER3.688 INCHES NOMINAL IN
MATERIALRUBBER OVERALL
SUBSTITUTES & CROSS-REFERENCES 1
37-20-3Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is AD857?
AD857 is a ADAPTER,DUCT FAN.
What parts can replace AD857?
There is 1 known substitute for AD857: 37-20-3. Substitute compatibility should be verified for your specific system.
What is the NSN for AD857?
AD857 is cataloged in the U.S. Government catalog under NSN 5330-00-629-5065. 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.