PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

FP50Attenuator,fixed

Trilithic, Inc. · NSN 5985-00-128-2929 · FSC 5985 · No Item Name Available
Verified by PartsTable
NSN 5985-00-128-2929 — this item is cataloged by the U.S. Government under National Stock Number 5985-00-128-2929. Primary manufacturer part number: FP50.
Features
  • Attenuator,fixed — FSC 5985
  • Application Design: TRANSMISSION LINE
  • Body Style: ROUND, TERMINAL/TERMINALS IN OPPOSITE SURFACE
  • Terminal Type and Quantity: 2 CONNECTOR
  • Attenuation Accuracy Reference Frequency: 500.0 MEGAHERTZ
  • Frequency Range: 0.000 HERTZ MINIMUM AND 2.000 GIGAHERTZ MAXIMUM
  • Connection Type Per Function: FEMALE OUTPUT AND MALE INPUT
  • Voltage Standing Wave Ratio Frequency Range: +0.0 TO 1.0 GIGAHERTZ
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Attenuator,fixed, cataloged under National Stock Number 5985-00-128-2929, is classified within Federal Supply Class 5985 (No Item Name Available) of the Electrical and Electronic Equipment Components group. The primary manufacturer of record is Trilithic, Inc.. Government technical data includes 16 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 2 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 8 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5985-00-128-2929
Primary Part NumberFP50
Item NameAttenuator,fixed
FSC / FSG5985 / 59 — No Item Name Available
ManufacturerTrilithic, Inc.
StatusACTIVE
Application DesignTRANSMISSION LINE
Body StyleROUND, TERMINAL/TERMINALS IN OPPOSITE SURFACE
Terminal Type and Quantity2 CONNECTOR
Attenuation Accuracy Reference Frequency500.0 MEGAHERTZ
Frequency Range0.000 HERTZ MINIMUM AND 2.000 GIGAHERTZ MAXIMUM
Connection Type Per FunctionFEMALE OUTPUT AND MALE INPUT
Voltage Standing Wave Ratio Frequency Range+0.0 TO 1.0 GIGAHERTZ
Mounting MethodCONNECTOR
Voltage Standing Wave Ratio1.20
Power Rating1.0 WATTS AVERAGE
Overall Diameter0.562 INCHES NOMINAL IN
Input Impedance Rating in Ohms50.0
Coaxial Connector Series DesignationBNC
Attenuation Accuracy in Decibels-0.30 TO 0.30
Output Impedance Rating in Ohms50.0
Rf Signal Attenuation in Decibels6.0
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 8
5985-00-022-3506MDC88209-6 INTERCHANGEABLE
Attenuator,fixed
Dal-Tech Devices, Inc. Dba Dal-Tech Devices Inc Div Dal-Tec Devices, Inc
5970-00-058-1251100-050-NY INTERCHANGEABLE
Insulator,disk
The Delbert Blinn Co Inc
5985-00-175-70781801445-6 INTERCHANGEABLE
Attenuator,fixed
Northrop Grumman Systems Corporation
1730-00-670-1556404055-1 INTERCHANGEABLE
Sling,aircraft Maintenance
Lockheed Martin Corp
5985-00-689-1923 INTERCHANGEABLE
Attenuator,fixed
5330-01-130-7408 INTERCHANGEABLE
Seal Kit
5985-01-151-2829CN-1289/U INTERCHANGEABLE
Attenuator,fixed
Joint Electronics Type Designation System
1005-01-420-3930 INTERCHANGEABLE
Pin,firing
Cross-Reference Index
Part NumberManufacturer
FP50 Trilithic, Inc. (USA)
404055-1 L3harris Technologies, Inc. Dba Harris Corp Div Antenna Products (USA)
Related Parts
5985-00-022-3506INTERCHANGEABLE
ATTENUATOR,FIXED
MDC88209-6
5970-00-058-1251INTERCHANGEABLE
INSULATOR,DISK
100-050-NY
5985-00-175-7078INTERCHANGEABLE
ATTENUATOR,FIXED
1801445-6
1730-00-670-1556INTERCHANGEABLE
SLING,AIRCRAFT MAINTENANCE
404055-1
5985-00-689-1923INTERCHANGEABLE
ATTENUATOR,FIXED
5330-01-130-7408INTERCHANGEABLE
SEAL KIT
5985-01-151-2829INTERCHANGEABLE
ATTENUATOR,FIXED
CN-1289/U
1005-01-420-3930INTERCHANGEABLE
PIN,FIRING

Frequently Asked Questions

What is NSN 5985-00-128-2929?

NSN 5985-00-128-2929 is a Attenuator,fixed, manufactured by Trilithic, Inc., classified under FSC 5985 (No Item Name Available). Status: active.

What are the part numbers for NSN 5985-00-128-2929?

NSN 5985-00-128-2929 has 2 cross-referenced part numbers: FP50 (Trilithic, Inc.), 404055-1 (L3harris Technologies, Inc. Dba Harris Corp Div Antenna Products).

What NSN replaces 5985-00-128-2929?

There are 8 known substitutes for 5985-00-128-2929: 5985-00-022-3506, 5970-00-058-1251, 5985-00-175-7078 and 5 more. Verify interchangeability with system specifications before substitution.

What are the specifications of FP50?

Key specifications for FP50: Application Design: TRANSMISSION LINE; Body Style: ROUND, TERMINAL/TERMINALS IN OPPOSITE SURFACE; Terminal Type and Quantity: 2 CONNECTOR; Attenuation Accuracy Reference Frequency: 500.0 MEGAHERTZ. 17 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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