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Technical Data Sheet
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011581 — Technical Data Sheet

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— · ORING SEAL
WHAT YOU NEED TO KNOW
Material determines chemical compatibility Standard durometer is 70 Shore A
Wrong material = catastrophic seal failure
PRODUCT OVERVIEW

The FAN,TUBEAXIAL is a the manufacturer thermal management component critical for maintaining optimal operating temperatures in enterprise hardware. Key specifications include width: 3.940 INCHES NOMINAL IN, height: 3.940 INCHES NOMINAL IN, length: 1.790 INCHES NOMINAL IN, drive_type: DIRECT, style_designator: FIXED, housing_inside_diameter: 3.070 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System under NSN 5330-00-054-6890, 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
011581
NSN: 5330-00-054-6890
FSC: 5330
CAGE: D0078 — DIEHL DEFENCE GMBH & CO. KG (DEU)
SPECIFICATIONS
width3.940 INCHES NOMINAL IN
height3.940 INCHES NOMINAL IN
length1.790 INCHES NOMINAL IN
drive_typeDIRECT
style_designatorFIXED
housing_inside_diameter3.070 INCHES NOMINAL IN
mounting_facility_type_and_quantity4 UNTHREADED HOLE(S)
rotation_direction_for_which_designedCOUNTERCLOCKWISE
NSN5330-00-054-6890
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 011581 MFR: OEM ⚠ VERIFY BEFORE ORDERING Wrong material = failure. Viton for oil/fuel, EPDM for water/steam, Buna-N for general purpose, Silicone for food-grade. Chemical incompatibility causes swelling, brittleness, or rapid degradation ✓ BROKER TIP Durometer (hardness) affects sealing pressure tolerance. Higher Shore A = harder = higher pressure. Standard durometer is 70A — verify if application requires different hardness PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
CROSS-SECTIONAL HEIGHT: 0.135 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN
•
CENTER HOLE DIAMETER: 5.461 INCHES MINIMUM AND 5.507 INCHES MAXIMUM IN
TYPICAL APPLICATIONS
  • Server thermal management and cooling
  • Hot-swap fan replacement in production environments
  • Redundant cooling for high-availability systems
TECHNICAL CHARACTERISTICS
CROSS-SECTIONAL HEIGHT0.135 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN
CENTER HOLE DIAMETER5.461 INCHES MINIMUM AND 5.507 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 27
186632InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
25-10-P03InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
816-11InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
820-22InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
NAS398-114InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
6625PL0738007InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLEDGOVERNMENT REGISTRY
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 011581?
011581 is a FAN,TUBEAXIAL.
What parts can replace 011581?
There are 27 known substitutes for 011581: 186632, 25-10-P03, 816-11 and 24 more. Substitute compatibility should be verified for your specific system.
Is 011581 still available?
011581 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: September 2026