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18998 ✓ Verified by PartsTable
— · COMPONENT
WHAT YOU NEED TO KNOW
Verify manufacturer and server generation compatibility Check if Option PN or Spare PN — same part, different channel
Confirm exact part number — similar PNs may be different parts
PRODUCT OVERVIEW

The IMPELLER,FAN,CENTRIFUGAL is a the manufacturer thermal management component critical for maintaining optimal operating temperatures in enterprise hardware. Key specifications include nominal_overall_diameter: 0.25 INCHES IN, part_name_assigned_by_controlling_agency: 1/4 INCH TORQUE CRT ASSEMBLY 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 4140-01-143-9661, 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
18998
NSN: 4140-01-143-9661
FSC: 4140
CAGE: 75377 — KURZ & ROOT GENERATOR COMPANY, LLC (USA)
SPECIFICATIONS
nominal_overall_diameter0.25 INCHES IN
part_name_assigned_by_controlling_agency1/4 INCH TORQUE CRT ASSEMBLY IN
NSN4140-01-143-9661
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available IMPELLER,FAN,CENTRIFUGAL TITLE COMPONENT PN 18998 MFR IMPELLER,FAN,CENTRIFUG
KEY FEATURES
•
MOUNTING HOLE QUANTITY: 4
•
MOUNTING BOLT CIRCLE DIAMETER: 4.750 INCHES NOMINAL IN
•
ATTACHMENT METHOD: BOLT HOLE
•
BLADE QUANTITY: 18
•
ROTATION DIRECTION FOR WHICH DESIGNED: COUNTERCLOCKWISE
•
MATERIAL: ALUMINUM ALLOY OVERALL
•
STYLE DESIGNATOR: CURVED BLADES SINGLE WIDTH
TYPICAL APPLICATIONS
  • Server thermal management and cooling
  • Hot-swap fan replacement in production environments
  • Redundant cooling for high-availability systems
TECHNICAL CHARACTERISTICS (FLIS)
MOUNTING HOLE QUANTITY4
SPECIAL FEATURESDESIGNED FOR CCW ROTATION DIRECTION
MOUNTING BOLT CIRCLE DIAMETER4.750 INCHES NOMINAL IN
ATTACHMENT METHODBOLT HOLE
BLADE QUANTITY18
ROTATION DIRECTION FOR WHICH DESIGNEDCOUNTERCLOCKWISE
MATERIALALUMINUM ALLOY OVERALL
STYLE DESIGNATORCURVED BLADES SINGLE WIDTH
MOUNTING HOLE DIAMETER0.562 INCHES NOMINAL IN
DIAMETER22.000 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 4
18998Interchangeable
interchangeable cross-reference
interchangeable
1000821Interchangeable
interchangeable cross-reference
interchangeable
12759-00345Interchangeable
interchangeable cross-reference
interchangeable
707795Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 18998?
18998 is a IMPELLER,FAN,CENTRIFUGAL.
What parts can replace 18998?
There are 4 known substitutes for 18998: 18998, 1000821, 12759-00345 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 18998?
18998 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4140-01-143-9661. 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