PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

5-1257Transformer,power

Superior Electric Holding Group Llc Div Specialty Product Technologies · NSN 5950-00-903-2863 · FSC 5950 · No Item Name Available
Verified by PartsTable
NSN 5950-00-903-2863 — this item is cataloged by the U.S. Government under National Stock Number 5950-00-903-2863. Primary manufacturer part number: 5-1257.
Features
  • Transformer,power — FSC 5950
  • Reliability Indicator: NOT ESTABLISHED
  • Body Length: 3.313 INCHES NOMINAL IN
  • Body Outside Diameter: 1.813 INCHES NOMINAL IN
  • Mounting Method: UNTHREADED HOLE(S) SINGLE GROUP
  • Inclosure Type: FULLY INCLOSED
  • Frequency Rating: 400.0 HERTZ MINIMUM AND 800.0 HERTZ MAXIMUM SINGLE COMPONENT
  • Mounting Facility Quantity: 1 SINGLE GROUP
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Transformer,power, cataloged under National Stock Number 5950-00-903-2863, is classified within Federal Supply Class 5950 (No Item Name Available) of the Electrical and Electronic Equipment Components group. The primary manufacturer of record is Superior Electric Holding Group Llc Div Specialty Product Technologies. Government technical data includes 13 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 4 commercial cross-references from 3 manufacturers, enabling identification through both NSN and commercial part number lookups. 9 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN5950-00-903-2863
Primary Part Number5-1257
Item NameTransformer,power
FSC / FSG5950 / 59 — No Item Name Available
ManufacturerSuperior Electric Holding Group Llc Div Specialty Product Technologies
StatusCANCELLED
Reliability IndicatorNOT ESTABLISHED
Body Length3.313 INCHES NOMINAL IN
Body Outside Diameter1.813 INCHES NOMINAL IN
Mounting MethodUNTHREADED HOLE(S) SINGLE GROUP
Inclosure TypeFULLY INCLOSED
Frequency Rating400.0 HERTZ MINIMUM AND 800.0 HERTZ MAXIMUM SINGLE COMPONENT
Mounting Facility Quantity1 SINGLE GROUP
Winding Operating Voltage0.00 AC VOLTS MINIMUM AND 28.00 AC VOLTS MAXIMUM SINGLE COMPONENT SECOND PRIMARY
Mounting Hole Diameter0.375 INCHES NOMINAL SINGLE GROUP IN
Winding Function and Quantity2 PRIMARY, FIXED AUTOTRANSFORMER TYPE SINGLE COMPONENT
Input-Output Phase RelationshipSINGLE PHASE TO SINGLE PHASE SINGLE COMPONENT
Winding Operating Voltage115.00 AC VOLTS NOMINAL SINGLE COMPONENT FIRST PRIMARY
Winding Operating Current2.5 AMPERES AC MAXIMUM SINGLE COMPONENT SECOND PRIMARY
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 9
4730-00-047-947751257 INTERCHANGEABLE
Clamp,hose
Eaton Aeroquip Llc Dba Jackson North 1 Div Fluid and Electrical Distribution
5110-00-199-7292 INTERCHANGEABLE
Reamer,hand
5962-00-455-0839911411-10 INTERCHANGEABLE
Microcircuit,linear
Bae Systems Information and Electronic Systems Integration Inc.
5950-00-690-03655-1257 INTERCHANGEABLE
Transformer,power Autotransforme
Superior Electric Holding Group Llc Div Specialty Product Technologies
5977-00-799-81362-1257 INTERCHANGEABLE
Brush,electrical Contact
Kearfott Corporation Div Guidance and Navigation Division
6130-00-860-3420 INTERCHANGEABLE
Rectifier,metallic
9540-01-071-5882 INTERCHANGEABLE
Angle,structural
5340-01-106-130421257 INTERCHANGEABLE
Standoff,threaded,spacing
Smiths Aerospace, Inc., Electronic Systems-Grand Rapids
2520-01-396-5008203-10290 INTERCHANGEABLE
Torque Converter,vehicular
Sachs-Boge of America
Cross-Reference Index
Part NumberManufacturer
5-1257 PRIMARY Superior Electric Holding Group Llc Div Specialty Product Technologies (USA)
2-1257 PRIMARY Superior Electric Holding Group Llc Div Specialty Product Technologies (USA)
737118-01 Ge Aviation Systems Llc (USA)
68400151004 Elbitamerica, Inc. (USA)
Related Parts
4730-00-047-9477INTERCHANGEABLE
CLAMP,HOSE
51257
5110-00-199-7292INTERCHANGEABLE
REAMER,HAND
5962-00-455-0839INTERCHANGEABLE
MICROCIRCUIT,LINEAR
911411-10
5950-00-690-0365INTERCHANGEABLE
TRANSFORMER,POWER AUTOTRANSFORME
5-1257
5977-00-799-8136INTERCHANGEABLE
BRUSH,ELECTRICAL CONTACT
2-1257
6130-00-860-3420INTERCHANGEABLE
RECTIFIER,METALLIC
9540-01-071-5882INTERCHANGEABLE
ANGLE,STRUCTURAL
5340-01-106-1304INTERCHANGEABLE
STANDOFF,THREADED,SPACING
21257
2520-01-396-5008INTERCHANGEABLE
TORQUE CONVERTER,VEHICULAR
203-10290

Frequently Asked Questions

What is NSN 5950-00-903-2863?

NSN 5950-00-903-2863 is a Transformer,power, manufactured by Superior Electric Holding Group Llc Div Specialty Product Technologies, classified under FSC 5950 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 5950-00-903-2863?

NSN 5950-00-903-2863 has 4 cross-referenced part numbers: 5-1257 (Superior Electric Holding Group Llc Div Specialty Product Technologies), 2-1257 (Superior Electric Holding Group Llc Div Specialty Product Technologies), 737118-01 (Ge Aviation Systems Llc), 68400151004 (Elbitamerica, Inc.).

What NSN replaces 5950-00-903-2863?

There are 9 known substitutes for 5950-00-903-2863: 4730-00-047-9477, 5110-00-199-7292, 5962-00-455-0839 and 6 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 5-1257?

Key specifications for 5-1257: Reliability Indicator: NOT ESTABLISHED; Body Length: 3.313 INCHES NOMINAL IN; Body Outside Diameter: 1.813 INCHES NOMINAL IN; Mounting Method: UNTHREADED HOLE(S) SINGLE GROUP. 13 total characteristics are documented in the Federal Logistics Information System.

Is NSN 5950-00-903-2863 still in active supply?

NSN 5950-00-903-2863 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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