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H1645 — IMPELLER,FAN,CENTRIFUGAL

✓ Government record, cited
— · COMPONENT
PRODUCT OVERVIEW

H1645: IMPELLER,FAN,CENTRIFUGAL.

The IMPELLER,FAN,CENTRIFUGAL is a the manufacturer thermal management component critical for maintaining optimal operating temperatures in enterprise hardware. Key specifications include width: 0.625 INCHES NOMINAL IN, diameter: 3.188 INCHES NOMINAL IN, material: COPPER ALLOY OVERALL, special_features: 1/2-13 UNC EXTERNAL THD HUB,WITHOUT CENTERBORE, style_designator: STRAIGHT RADIAL W/ BACK PLATE, attachment_method: THREADED. This part is cataloged in the U.S.

Government catalog under NSN 4140-00-360-0621, 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
H1645
NSN: 4140-00-360-0621
FSC: 4140 — Fans, Air Circulators, and Blower Equipment
CAGE: 26689 — E O HABHEGGER COMPANY INC DIV E. O. HABHEGGER CO., INC. (USA)
SPECIFICATIONS
width0.625 INCHES NOMINAL IN
diameter3.188 INCHES NOMINAL IN
materialCOPPER ALLOY OVERALL
blade_quantity4
special_features1/2-13 UNC EXTERNAL THD HUB,WITHOUT CENTERBORE
style_designatorSTRAIGHT RADIAL W/ BACK PLATE
attachment_methodTHREADED
rotation_direction_for_which_designedCLOCKWISE
NSN4140-00-360-0621
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available IMPELLER,FAN,CENTRIFUGAL TITLE COMPONENT PN H1645 MFR IMPELLER,FAN,CENTRIFUG
KEY FEATURES
•
STYLE DESIGNATOR: STRAIGHT RADIAL W/ BACK PLATE
•
ATTACHMENT METHOD: THREADED
•
DIAMETER: 3.188 INCHES NOMINAL IN
•
BLADE QUANTITY: 4
•
WIDTH: 0.625 INCHES NOMINAL IN
•
MATERIAL: COPPER ALLOY OVERALL
•
ROTATION DIRECTION FOR WHICH DESIGNED: CLOCKWISE
TYPICAL APPLICATIONS
  • Server thermal management and cooling
  • Hot-swap fan replacement in production environments
  • Redundant cooling for high-availability systems
TECHNICAL CHARACTERISTICS
STYLE DESIGNATORSTRAIGHT RADIAL W/ BACK PLATE
ATTACHMENT METHODTHREADED
DIAMETER3.188 INCHES NOMINAL IN
BLADE QUANTITY4
SPECIAL FEATURES1/2-13 UNC EXTERNAL THD HUB,WITHOUT CENTERBORE
WIDTH0.625 INCHES NOMINAL IN
MATERIALCOPPER ALLOY OVERALL
ROTATION DIRECTION FOR WHICH DESIGNEDCLOCKWISE
SUBSTITUTES & CROSS-REFERENCES 1
26-25-26-15Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is H1645?
H1645 is a IMPELLER,FAN,CENTRIFUGAL.
What parts can replace H1645?
There is 1 known substitute for H1645: 26-25-26-15. Substitute compatibility should be verified for your specific system.
What is the NSN for H1645?
H1645 is cataloged in the U.S. Government catalog under NSN 4140-00-360-0621. 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.