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U21 — FAN,CENTRIFUGAL

✓ Government record, cited
— · MOTOR
PRODUCT OVERVIEW

U21: FAN,CENTRIFUGAL.

The FAN,CENTRIFUGAL is a the manufacturer thermal management component critical for maintaining optimal operating temperatures in enterprise hardware. Key specifications include phase: SINGLE INPUT, duty_cycle: CONTINUOUS, flat_depth: 0.0620 INCHES NOMINAL SINGLE END IN, winding_type: INDUCTION-SPLIT PHASE, overall_width: 3.312 INCHES IN, thread_length: 0.2500 INCHES NOMINAL SINGLE END IN. This part is cataloged in the U.S.

Government catalog under NSN 6105-00-372-4711, 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
U21
NSN: 6105-00-372-4711
NIINs: 003724711, 006571532
FSC: 6105 — Motors, Electrical
CAGE: 34XV3 — MILTON ROY LLC DBA MILTON ROY AMERICAS (USA)
SPECIFICATIONS
phaseSINGLE INPUT
duty_cycleCONTINUOUS
flat_depth0.0620 INCHES NOMINAL SINGLE END IN
winding_typeINDUCTION-SPLIT PHASE
overall_width3.312 INCHES IN
thread_length0.2500 INCHES NOMINAL SINGLE END IN
cooling_methodFAN COOLED
overall_height3.312 INCHES IN
overall_length5.750 INCHES IN
shaft_diameter0.2500 INCHES NOMINAL SINGLE END IN
mounting_methodFACE
shaft_end_styleEXTERNAL THREADED AND FLATTED SINGLE END
NSN6105-00-372-4711
COMPONENT DIAGRAM
ELECTRIC MOTOR — FRAME SIZE = MOUNTING PATTERN SHAFT J-BOX MOUNTING FEET — FRAME — — · — RPM — · — PN: U21 · OEM ⚠ VERIFY BEFORE ORDERING NEMA frame size determines mounting bolt pattern — not interchangeable. 56C ≠ 143T bolt pattern. C-face vs foot-mount vs flange — different mounting, same HP doesn't mean drop-in ✓ BROKER TIP TEFC = outdoor/washdown OK. ODP = dry indoor only. TENV = no external fan, explosion-proof areas. 1750 RPM = 4-pole (most common), 3450 RPM = 2-pole, 1150 RPM = 6-pole PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
MOUNTING FACILITY TYPE AND QUANTITY: 3 THREADED HOLE(S)
•
DUTY CYCLE: CONTINUOUS
•
PHASE: SINGLE INPUT
•
SHAFT DIAMETER: 0.2500 INCHES NOMINAL SINGLE END IN
•
FREQUENCY IN HERTZ: 50.0 OR 60.0 INPUT
•
SHAFT END STYLE: EXTERNAL THREADED AND FLATTED SINGLE END
•
WINDING TYPE: INDUCTION-SPLIT PHASE
TYPICAL APPLICATIONS
  • Server thermal management and cooling
  • Hot-swap fan replacement in production environments
  • Redundant cooling for high-availability systems
TECHNICAL CHARACTERISTICS
MOUNTING FACILITY TYPE AND QUANTITY3 THREADED HOLE(S)
DUTY CYCLECONTINUOUS
PHASESINGLE INPUT
SHAFT DIAMETER0.2500 INCHES NOMINAL SINGLE END IN
FREQUENCY IN HERTZ50.0 OR 60.0 INPUT
SHAFT END STYLEEXTERNAL THREADED AND FLATTED SINGLE END
OVERALL LENGTH5.750 INCHES IN
WINDING TYPEINDUCTION-SPLIT PHASE
MOUNTING METHODFACE
THREAD LENGTH0.2500 INCHES NOMINAL SINGLE END IN
SUBSTITUTES & CROSS-REFERENCES 2
12-1532-51Reference document
Same NSN cross-reference
Reference document — Secondary reference
7121-1445Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is U21?
U21 is a FAN,CENTRIFUGAL.
What parts can replace U21?
There are 2 known substitutes for U21: 12-1532-51, 7121-1445. Substitute compatibility should be verified for your specific system.
What is the NSN for U21?
U21 is cataloged in the U.S. Government catalog under NSN 6105-00-372-4711. This indicates validated use in U.S. government and defense supply chains.
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