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Technical Data Sheet
PartsTable / COMPONENT / 81857
81857 ✓ Verified by PartsTable
— · FAN MODULE
WHAT YOU NEED TO KNOW
Hot-plug fans can be replaced without shutdown Dual-rotor = higher CFM for high-power configs (GPU, dense storage)
AIRFLOW DIRECTION IS CRITICAL — reversed fan = thermal shutdown
PRODUCT OVERVIEW

The FAN ASSEMBLY is a the manufacturer thermal management component critical for maintaining optimal operating temperatures in enterprise hardware. Key specifications include width: 0.482 INCHES NOMINAL IN, length: 1.235 INCHES NOMINAL IN, material: STEEL COMP 302 OVERALL, special_features: IMMUNIZED, style_designator: RECTANGLE, overall_thickness: 0.068 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 2930-00-499-9973, 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
81857
NSN: 2930-00-499-9973
FSC: 2930
CAGE: 29215 — JENNY PRODUCTS, INC (USA)
SPECIFICATIONS
width0.482 INCHES NOMINAL IN
length1.235 INCHES NOMINAL IN
materialSTEEL COMP 302 OVERALL
special_featuresIMMUNIZED
style_designatorRECTANGLE
overall_thickness0.068 INCHES NOMINAL IN
mounting_hole_typeROUND, UNTHREADED
mounting_hole_diameter0.174 INCHES MINIMUM AND 0.184 INCHES MAXIMUM IN
cross-sectional_shape_styleFLAT W/O APERTURE
mounting_hole_arrangement_styleTHREE HOLES
material_document_and_classificationAMS 5516 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NSN2930-00-499-9973
COMPONENT DIAGRAM
HANDLE 60mm 60mm HOT-PLUG COOL IN HOT OUT DUAL ROTOR HOT-SWAP FAN MODULE | 60mm Dual Rotor | FRONT-TO-BACK Hot-plug | Redundant | TITLE FAN MODULE PN 81857 MFR OEM FAN ASSEMBLY
TYPICAL APPLICATIONS
  • Server thermal management and cooling
  • Hot-swap fan replacement in production environments
  • Redundant cooling for high-availability systems
VERIFIED SUBSTITUTES & CROSS-REFERENCES 14
225Interchangeable
interchangeable cross-reference
interchangeable
61429Interchangeable
interchangeable cross-reference
interchangeable
C91080AJPC428Interchangeable
interchangeable cross-reference
interchangeable
2-1449-36Interchangeable
interchangeable cross-reference
interchangeable
61429ACFGHNVV-4Interchangeable
interchangeable cross-reference
interchangeable
A6902Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 81857?
81857 is a FAN ASSEMBLY.
What parts can replace 81857?
There are 14 known substitutes for 81857: 225, 61429, C91080AJPC428 and 11 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 81857?
81857 is cataloged in the Federal Logistics Information System (FLIS) under NSN 2930-00-499-9973. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026