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Technical Data Sheet
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AD781 ✓ 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

HEAT SINK,ELECTRICAL-ELECTRONIC. Key specifications include material: RUBBER SYNTHETIC OVERALL, bend_radius: 2.500 INCHES NOMINAL IN, wall_thickness: 0.060 INCHES NOMINAL IN, working_length: 3.500 INCHES NOMINAL IN, inside_diameter: 1.250 INCHES NOMINAL IN, first_arm_length: 1.500 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 4720-00-730-5354, 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
AD781
NSN: 4720-00-730-5354
FSC: 4720
CAGE: 21868 — HBD INDUSTRIES, INC DIV HBD/THERMOID INC (USA)
SPECIFICATIONS
materialRUBBER SYNTHETIC OVERALL
bend_radius2.500 INCHES NOMINAL IN
wall_thickness0.060 INCHES NOMINAL IN
working_length3.500 INCHES NOMINAL IN
inside_diameter1.250 INCHES NOMINAL IN
first_arm_length1.500 INCHES NOMINAL IN
style_designatorSINGLE BEND
second_arm_length1.500 INCHES NOMINAL IN
NSN4720-00-730-5354
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 AD781 MFR OEM HEAT SINK,ELECTRICAL-ELECTRONIC
KEY FEATURES
•
BEND RADIUS: 2.500 INCHES NOMINAL IN
•
WALL THICKNESS: 0.060 INCHES NOMINAL IN
•
SECOND ARM LENGTH: 1.500 INCHES NOMINAL IN
•
FIRST ARM LENGTH: 1.500 INCHES NOMINAL IN
•
WORKING LENGTH: 3.500 INCHES NOMINAL IN
•
STYLE DESIGNATOR: SINGLE BEND
•
MATERIAL: RUBBER SYNTHETIC OVERALL
•
INSIDE DIAMETER: 1.250 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
BEND RADIUS2.500 INCHES NOMINAL IN
WALL THICKNESS0.060 INCHES NOMINAL IN
SECOND ARM LENGTH1.500 INCHES NOMINAL IN
FIRST ARM LENGTH1.500 INCHES NOMINAL IN
WORKING LENGTH3.500 INCHES NOMINAL IN
STYLE DESIGNATORSINGLE BEND
MATERIALRUBBER SYNTHETIC OVERALL
INSIDE DIAMETER1.250 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 10
50731AInterchangeable
interchangeable cross-reference
interchangeable
SC-B-70177Interchangeable
interchangeable cross-reference
interchangeable
50731Interchangeable
interchangeable cross-reference
interchangeable
4330008-1Interchangeable
interchangeable cross-reference
interchangeable
50731-2Interchangeable
interchangeable cross-reference
interchangeable
751378-1Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is AD781?
AD781 is a HEAT SINK,ELECTRICAL-ELECTRONIC.
What parts can replace AD781?
There are 10 known substitutes for AD781: 50731A, SC-B-70177, 50731 and 7 more. Substitute compatibility should be verified for your specific system.
What is the NSN for AD781?
AD781 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4720-00-730-5354. 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