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Technical Data Sheet
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50-121-2 ✓ 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 BATTERY POWER SUPPLY is a the manufacturer cache protection component designed to preserve data integrity during power loss events in enterprise server and storage controller environments. Key specifications include material: STEEL COMP 1074, ring_style: INTERNAL, usage_design: INTERNAL, major_thickness: 0.033 INCHES MINIMUM AND 0.037 INCHES MAXIMUM IN, outside_diameter: 0.555 INCHES MINIMUM AND 0.570 INCHES MAXIMUM IN, special_features: OUTPUT FREQUENCY RATING: 60.0 HZ NOMINAL. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5325-00-926-5440, 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
50-121-2
NSN: 5325-00-926-5440
FSC: 5325
CAGE: 77445 — RTX CORPORATION DBA PRATT & WHITNEY DIV PRATT &WHITNEY (USA)
SPECIFICATIONS
materialSTEEL COMP 1074
ring_styleINTERNAL
usage_designINTERNAL
major_thickness0.033 INCHES MINIMUM AND 0.037 INCHES MAXIMUM IN
outside_diameter0.555 INCHES MINIMUM AND 0.570 INCHES MAXIMUM IN
special_featuresOUTPUT FREQUENCY RATING: 60.0 HZ NOMINAL
surface_treatmentCADMIUM
output_voltage_rating120.0 AC VOLTS NOMINAL SINGLE POWER OUTPUT
casehardening_indicatorNOT CASEHARDENED
end_item_identificationS58 NX MGT-6626, ALLIANCE LAUNDRY SYSTEMS LLC
material_hardness_rating66.0 ROCKWELL SUPERFICIAL 30-N MINIMUM AND 73.0 ROCKWELL SUPERFICIAL 30-N MAXIMUM
cross-sectional_shape_styleRECTANGULAR
NSN5325-00-926-5440
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 50-121-2 MFR OEM Platinum
KEY FEATURES
•
MATERIAL: STEEL COMP 1074
•
SURFACE TREATMENT: CADMIUM
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5120, COMPOSITION 1074 ASSN STD SINGLE MATERIAL RESPONSE
•
MATERIAL HARDNESS RATING: 66.0 ROCKWELL SUPERFICIAL 30-N MINIMUM AND 73.0 ROCKWELL SUPERFICIAL 30-N MAXIMUM
•
USAGE DESIGN: INTERNAL
•
MAJOR THICKNESS: 0.033 INCHES MINIMUM AND 0.037 INCHES MAXIMUM IN
•
RING STYLE: INTERNAL
•
OUTSIDE DIAMETER: 0.555 INCHES MINIMUM AND 0.570 INCHES MAXIMUM IN
TYPICAL APPLICATIONS
  • RAID cache protection during power loss events
  • Write-back cache enablement for storage controllers
  • Enterprise server data integrity assurance
  • Hot-swap battery/capacitor replacement in production
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALSTEEL COMP 1074
SURFACE TREATMENTCADMIUM
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5120, COMPOSITION 1074 ASSN STD SINGLE MATERIAL RESPONSE
MATERIAL HARDNESS RATING66.0 ROCKWELL SUPERFICIAL 30-N MINIMUM AND 73.0 ROCKWELL SUPERFICIAL 30-N MAXIMUM
USAGE DESIGNINTERNAL
MAJOR THICKNESS0.033 INCHES MINIMUM AND 0.037 INCHES MAXIMUM IN
RING STYLEINTERNAL
OUTSIDE DIAMETER0.555 INCHES MINIMUM AND 0.570 INCHES MAXIMUM IN
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
CASEHARDENING INDICATORNOT CASEHARDENED
VERIFIED SUBSTITUTES & CROSS-REFERENCES 13
MS28775-327Interchangeable
interchangeable cross-reference
interchangeable
7377-327Interchangeable
interchangeable cross-reference
interchangeable
SAE-AS28775Interchangeable
interchangeable cross-reference
interchangeable
71161Interchangeable
interchangeable cross-reference
interchangeable
5920Interchangeable
interchangeable cross-reference
interchangeable
501212Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 50-121-2?
50-121-2 is a BATTERY POWER SUPPLY.
What parts can replace 50-121-2?
There are 13 known substitutes for 50-121-2: MS28775-327, 7377-327, SAE-AS28775 and 10 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 50-121-2?
50-121-2 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5325-00-926-5440. This indicates validated use in U.S. government and defense supply chains.
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Last verified: July 2026