18998 — Technical Data Sheet

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— · 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 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_diameter	0.25 INCHES IN
part_name_assigned_by_controlling_agency	1/4 INCH TORQUE CRT ASSEMBLY IN
NSN	4140-01-143-9661

COMPONENT DIAGRAM

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

MOUNTING HOLE QUANTITY	4
SPECIAL FEATURES	DESIGNED FOR CCW ROTATION DIRECTION
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
MOUNTING HOLE DIAMETER	0.562 INCHES NOMINAL IN
DIAMETER	22.000 INCHES NOMINAL IN

VERIFIED SUBSTITUTES & CROSS-REFERENCES 3

1000821InterchangeableGOVERNMENT REGISTRY

interchangeable cross-reference

interchangeable

12759-00345InterchangeableGOVERNMENT REGISTRY

interchangeable cross-reference

interchangeable

707795InterchangeableGOVERNMENT REGISTRY

interchangeable cross-reference

interchangeable

LIFECYCLE

StatusACTIVEGOVERNMENT REGISTRY

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 3 known substitutes for 18998: 1000821, 12759-00345, 707795. Substitute compatibility should be verified for your specific system.

What is the NSN for 18998?

18998 is cataloged in the Federal Logistics Information System under NSN 4140-01-143-9661. This indicates validated use in U.S. government and defense supply chains.

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18998 — Technical Data Sheet

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