PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

D557Transformer,power

Sonic Instruments Inc · NSN 5950-00-434-4350 · FSC 5950 · No Item Name Available
Verified by PartsTable
NSN 5950-00-434-4350 — this item is cataloged by the U.S. Government under National Stock Number 5950-00-434-4350. Primary manufacturer part number: D557.
Features
  • Transformer,power — FSC 5950
  • Winding Operating Voltage: 46.00 AC VOLTS MAXIMUM SINGLE COMPONENT SINGLE SECONDARY
  • Frequency Rating: 60.0 HERTZ NOMINAL SINGLE COMPONENT
  • Winding Function and Quantity: 1 PRIMARY AND 1 SECONDARY SINGLE COMPONENT
  • Input-Output Phase Relationship: SINGLE PHASE TO SINGLE PHASE SINGLE COMPONENT
  • Inclosure Type: FULLY INCLOSED
  • Terminal Type and Quantity: 5 TAB, SOLDER LUG
  • Mounting Hole Diameter: 0.190 INCHES NOMINAL SINGLE GROUP IN
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Transformer,power, cataloged under National Stock Number 5950-00-434-4350, 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 Sonic Instruments Inc. Government technical data includes 14 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 1 commercial cross-reference from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 2 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5950-00-434-4350
Primary Part NumberD557
Item NameTransformer,power
FSC / FSG5950 / 59 — No Item Name Available
ManufacturerSonic Instruments Inc
StatusACTIVE
Winding Operating Voltage46.00 AC VOLTS MAXIMUM SINGLE COMPONENT SINGLE SECONDARY
Frequency Rating60.0 HERTZ NOMINAL SINGLE COMPONENT
Winding Function and Quantity1 PRIMARY AND 1 SECONDARY SINGLE COMPONENT
Input-Output Phase RelationshipSINGLE PHASE TO SINGLE PHASE SINGLE COMPONENT
Inclosure TypeFULLY INCLOSED
Terminal Type and Quantity5 TAB, SOLDER LUG
Mounting Hole Diameter0.190 INCHES NOMINAL SINGLE GROUP IN
Mounting Facility Quantity2 SINGLE GROUP
Body Width2.000 INCHES MAXIMUM IN
Distance Between Mounting Facility Centers3.115 INCHES MINIMUM AND 3.135 INCHES MAXIMUM SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN
Winding Operating Voltage117.00 AC VOLTS NOMINAL SINGLE COMPONENT SINGLE PRIMARY
Reliability IndicatorNOT ESTABLISHED
Body Height2.180 INCHES MINIMUM AND 2.220 INCHES MAXIMUM IN
Mounting MethodFLANGE AND UNTHREADED HOLE(S) SINGLE GROUP
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 2
5330-00-378-724327122H INTERCHANGEABLE
Gasket
Navistar Intl Corp Truck Br Ohio Plant
6625-00-553-8421 INTERCHANGEABLE
Meter,field Strength
Cross-Reference Index
Part NumberManufacturer
D557 Sonic Instruments Inc (USA)
Related Parts
5330-00-378-7243INTERCHANGEABLE
GASKET
27122H
6625-00-553-8421INTERCHANGEABLE
METER,FIELD STRENGTH

Frequently Asked Questions

What is NSN 5950-00-434-4350?

NSN 5950-00-434-4350 is a Transformer,power, manufactured by Sonic Instruments Inc, classified under FSC 5950 (No Item Name Available). Status: active.

What are the part numbers for NSN 5950-00-434-4350?

NSN 5950-00-434-4350 has 1 cross-referenced part number: D557 (Sonic Instruments Inc).

What NSN replaces 5950-00-434-4350?

There are 2 known substitutes for 5950-00-434-4350: 5330-00-378-7243, 6625-00-553-8421. Verify interchangeability with system specifications before substitution.

What are the specifications of D557?

Key specifications for D557: Overall Length: 3.480 INCHES MINIMUM AND 3.520 INCHES MAXIMUM IN; Winding Operating Voltage: 46.00 AC VOLTS MAXIMUM SINGLE COMPONENT SINGLE SECONDARY; Frequency Rating: 60.0 HERTZ NOMINAL SINGLE COMPONENT; Winding Function and Quantity: 1 PRIMARY AND 1 SECONDARY SINGLE COMPONENT. 15 total characteristics are documented in the Federal Logistics Information System.

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