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501991 ✓ Verified by PartsTable
— · PSU
WHAT YOU NEED TO KNOW
Always quote matching pair — mixed wattage causes throttling Platinum/Titanium = higher efficiency = lower power cost over time
AC or DC input? Verify customer site power
PRODUCT OVERVIEW

The POWER SUPPLY ASSEMBLY is a the manufacturer power supply unit built for continuous operation in enterprise server and storage platforms. Key specifications include material: STEEL, body_style: STRAIGHT SHAPE, INTERNAL COUPLING W/BACKSHELL, shell_type: SOLID, thread_class: 2A AND 2B A, hole_diameter: 0.438 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN, overall_width: 5.500 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 1610-00-303-6785, 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
501991
NSN: 1610-00-303-6785
FSC: 1610
CAGE: 73030 — HAMILTON SUNDSTRAND CORPORATION DBA COLLINS AEROSPACE (USA)
SPECIFICATIONS
materialSTEEL
body_styleSTRAIGHT SHAPE, INTERNAL COUPLING W/BACKSHELL
shell_typeSOLID
thread_class2A AND 2B A
hole_diameter0.438 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
overall_width5.500 INCHES NOMINAL IN
terminal_typeSOLDER WELL SINGLE MATING END SINGLE CONTACT GROUPING
aperture_width4.000 INCHES NOMINAL IN
overall_length1.593 INCHES NOMINAL IN
shell_materialALUMINUM ALLOY
aperture_length15.250 INCHES NOMINAL IN
insert_materialRUBBER SINGLE MATING END
NSN1610-00-303-6785
COMPONENT DIAGRAM
PULL TAB AIRFLOW —W PLATINUM 100-240V~ 50/60Hz OEM BACKPLANE CONN ~200 mm HOT-PLUG POWER SUPPLY | —W | Platinum AC input 100-240V | Redundant pair required | Match wattage in same chassis TITLE PSU —W PN 501991 MFR OEM Platinum
TYPICAL APPLICATIONS
  • Server power supply replacement (failed or degraded)
  • Redundant power upgrade for high-availability
  • Power capacity upgrade for GPU or expansion configurations
  • Hot-swap power maintenance in production environments
  • Spare inventory for break-fix operations
VERIFIED SUBSTITUTES & CROSS-REFERENCES 10
80170Interchangeable
interchangeable cross-reference
interchangeable
C-6647PC2Interchangeable
interchangeable cross-reference
interchangeable
C2816PC3Interchangeable
interchangeable cross-reference
interchangeable
10-306860-04SInterchangeable
interchangeable cross-reference
interchangeable
9380-4Interchangeable
interchangeable cross-reference
interchangeable
9380-1Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 501991?
501991 is a POWER SUPPLY ASSEMBLY.
What parts can replace 501991?
There are 10 known substitutes for 501991: 80170, C-6647PC2, C2816PC3 and 7 more. Substitute compatibility should be verified for your specific system.
Is 501991 still available?
501991 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: July 2026