PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

26263-404Transformer,audio Frequency

The Boeing Company Div Legacy Boeing Hb1 · NSN 5950-00-660-7320 · FSC 5950 · No Item Name Available
Verified by PartsTable
NSN 5950-00-660-7320 — this item is cataloged by the U.S. Government under National Stock Number 5950-00-660-7320. Primary manufacturer part number: 26263-404.
Features
  • Transformer,audio Frequency — FSC 5950
  • Reliability Indicator: NOT ESTABLISHED
  • Impedance Rating in Ohms: 1000000.0 NOMINAL SINGLE COMPONENT THIRD SECONDARY
  • Impedance Rating in Ohms: 50000.0 NOMINAL SINGLE COMPONENT SINGLE PRIMARY
  • Thread Quantity Per Inch: 56 SINGLE GROUP
  • Impedance Rating in Ohms: 100000.0 NOMINAL SINGLE COMPONENT FIRST SECONDARY
  • Winding Operating Current: 3.0 MILLIAMPERES DC MAXIMUM SINGLE COMPONENT SINGLE PRIMARY
  • Maximum Transformer Power Rating: 240.0 MILLIWATTS SINGLE COMPONENT
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Transformer,audio Frequency, cataloged under National Stock Number 5950-00-660-7320, 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 The Boeing Company Div Legacy Boeing Hb1. Government technical data includes 23 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 3 commercial cross-references from 3 manufacturers, enabling identification through both NSN and commercial part number lookups. 7 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5950-00-660-7320
Primary Part Number26263-404
Item NameTransformer,audio Frequency
FSC / FSG5950 / 59 — No Item Name Available
ManufacturerThe Boeing Company Div Legacy Boeing Hb1
StatusACTIVE
Reliability IndicatorNOT ESTABLISHED
Impedance Rating in Ohms1000000.0 NOMINAL SINGLE COMPONENT THIRD SECONDARY
Impedance Rating in Ohms50000.0 NOMINAL SINGLE COMPONENT SINGLE PRIMARY
Thread Quantity Per Inch56 SINGLE GROUP
Impedance Rating in Ohms100000.0 NOMINAL SINGLE COMPONENT FIRST SECONDARY
Winding Operating Current3.0 MILLIAMPERES DC MAXIMUM SINGLE COMPONENT SINGLE PRIMARY
Maximum Transformer Power Rating240.0 MILLIWATTS SINGLE COMPONENT
Frequency Rating400.0 HERTZ MAXIMUM SINGLE COMPONENT
Center to Center Distance Between Mounting Facilities Parallel to Length1.000 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN
Mounting Facility Quantity4 SINGLE GROUP
Mounting MethodTHREADED HOLE(S) SINGLE GROUP
Body Height1.375 INCHES NOMINAL IN
Body Width1.139 INCHES NOMINAL IN
Inclosure TypeHERMETICALLY SEALED
Winding Shielding MethodINTERNAL SHIELD GROUNDED TO CORE AND BROUGHT OUT TO TERMINAL SINGLE COMPONENT
Thread Series DesignatorUNIFIED NATIONAL COARSE (UNC) SINGLE GROUP
Winding Function and Quantity1 PRIMARY AND 3 SECONDARY SINGLE COMPONENT
Primary to Secondary Turn Ratio1 TO 1 TO 1 TO 1 SINGLE COMPONENT
Body Length1.421 INCHES NOMINAL IN
Nominal Thread Size0.086 INCHES SINGLE GROUP IN
Impedance Rating in Ohms100000.0 NOMINAL SINGLE COMPONENT SECOND SECONDARY
Terminal Type and Quantity9 TAB, SOLDER LUG
Center to Center Distance Between Mounting Facilities Parallel to Width0.700 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 7
4820-00-060-3387740-04 INTERCHANGEABLE
Retainer,disk,valve
Pentair Filtration Solutions, Llc
4730-00-186-9961AS5195W0402 INTERCHANGEABLE
Elbow,pipe to Tube
Sae International Dba Sae International
5120-00-224-2508 INTERCHANGEABLE
Key,socket Head Screw
4140-01-117-7733177080-137 INTERCHANGEABLE
Fan,tubeaxial
Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp
6645-01-247-454974004 INTERCHANGEABLE
Timer,interval
Lockheed Martin Corporation
5342-01-352-640674004 INTERCHANGEABLE
Cap,filler Opening
DP Manufacturing Inc.
4130-01-669-8409 INTERCHANGEABLE
Cooler Unit,air
Cross-Reference Index
Part NumberManufacturer
74004 Standard Industries (USA)
26263-404 PRIMARY The Boeing Company Div Legacy Boeing Hb1 (USA)
PEI 9462 Precision Electronics, Inc (USA)
Related Parts
4820-00-060-3387INTERCHANGEABLE
RETAINER,DISK,VALVE
740-04
4730-00-186-9961INTERCHANGEABLE
ELBOW,PIPE TO TUBE
AS5195W0402
5120-00-224-2508INTERCHANGEABLE
KEY,SOCKET HEAD SCREW
4140-01-117-7733INTERCHANGEABLE
FAN,TUBEAXIAL
177080-137
6645-01-247-4549INTERCHANGEABLE
TIMER,INTERVAL
74004
5342-01-352-6406INTERCHANGEABLE
CAP,FILLER OPENING
74004
4130-01-669-8409INTERCHANGEABLE
COOLER UNIT,AIR

Frequently Asked Questions

What is NSN 5950-00-660-7320?

NSN 5950-00-660-7320 is a Transformer,audio Frequency, manufactured by The Boeing Company Div Legacy Boeing Hb1, classified under FSC 5950 (No Item Name Available). Status: active.

What are the part numbers for NSN 5950-00-660-7320?

NSN 5950-00-660-7320 has 3 cross-referenced part numbers: 74004 (Standard Industries), 26263-404 (The Boeing Company Div Legacy Boeing Hb1), PEI 9462 (Precision Electronics, Inc).

What NSN replaces 5950-00-660-7320?

There are 7 known substitutes for 5950-00-660-7320: 4820-00-060-3387, 4730-00-186-9961, 5120-00-224-2508 and 4 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 26263-404?

Key specifications for 26263-404: Reliability Indicator: NOT ESTABLISHED; Impedance Rating in Ohms: 1000000.0 NOMINAL SINGLE COMPONENT THIRD SECONDARY; Impedance Rating in Ohms: 50000.0 NOMINAL SINGLE COMPONENT SINGLE PRIMARY; Thread Quantity Per Inch: 56 SINGLE GROUP. 24 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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