PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

4A1A4Attenuator,variable

Probescope Co Inc · NSN 5985-00-921-7805 · FSC 5985 · No Item Name Available
Verified by PartsTable
NSN 5985-00-921-7805 — this item is cataloged by the U.S. Government under National Stock Number 5985-00-921-7805. Primary manufacturer part number: 4A1A4.
Features
  • Attenuator,variable — FSC 5985
  • Terminal Type and Quantity: 2 WIRE LEAD AND 1 THREADED STUD
  • Application Design: TRANSMISSION LINE
  • Step Position Quantity: 11
  • Frequency Range: 10.000 HERTZ MINIMUM AND 500.000 KILOHERTZ MAXIMUM
  • Operating Temp Range: -28.0 TO 65.0 CELSIUS DEGC
  • Impedance Rating in Ohms: 600.0 INPUT-OUTPUT
  • Overall Attenuation Range in Decibels: +0.0 TO 10.0
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Attenuator,variable, cataloged under National Stock Number 5985-00-921-7805, 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 Probescope Co Inc. Government technical data includes 15 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 7 commercial cross-references from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5985-00-921-7805
Primary Part Number4A1A4
Item NameAttenuator,variable
FSC / FSG5985 / 59 — No Item Name Available
ManufacturerProbescope Co Inc
StatusACTIVE
Terminal Type and Quantity2 WIRE LEAD AND 1 THREADED STUD
Application DesignTRANSMISSION LINE
Step Position Quantity11
Frequency Range10.000 HERTZ MINIMUM AND 500.000 KILOHERTZ MAXIMUM
Operating Temp Range-28.0 TO 65.0 CELSIUS DEGC
Impedance Rating in Ohms600.0 INPUT-OUTPUT
Overall Attenuation Range in Decibels+0.0 TO 10.0
Scale Division Quantity10
Attenuation Per Step in Decibels1.0
Vernier Scale Division Quantity1
Adjustment Device Type and Quantity1 KNOB
Mounting Facility Type and Quantity1 BUSHING
Overall Diameter2.371 INCHES NOMINAL IN
Attenuation Variation MethodSTEPPED
Body StyleCYLINDRICAL W/ADJUSTMENT KNOB
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
5910-00-081-1041NLW25-25 INTERCHANGEABLE
Capacitor,fixed,electrolytic
Cornell-Dubilier Marketing Inc
2520-00-149-74801441 INTERCHANGEABLE
Retainer,clutch Sha
Dana Corp Spicer Transmission Div
5331-00-257-3605 INTERCHANGEABLE
O-Ring
5910-00-901-8796 INTERCHANGEABLE
Capacitor,fixed,mica Dielectric
5930-00-955-98472181743-1 INTERCHANGEABLE
Switch,rotary
Lockheed Martin Corporation Div Rms
6675-01-091-19261441 INTERCHANGEABLE
Kit,alignment Assembly
Leidos, Inc. Div Cyber and Information Solutions Services
6105-01-154-69221441 INTERCHANGEABLE
Motor,alternating Current
General Electric Co Motor Business Group
3530-01-195-91781441 INTERCHANGEABLE
Bobbin,sewing Machine
Consolidated Sewing Machine Corp
5950-01-293-83214810-200-04-00 INTERCHANGEABLE
Coil,electrical
Jackson Msc, Llc Dba Jackson Dishmachines
7045-01-369-2697 INTERCHANGEABLE
Disk,flexible
Cross-Reference Index
Part NumberManufacturer
4A1A4 Probescope Co Inc (USA)
B2646 Probescope Co Inc (USA)
1441 Probescope Co Inc (USA)
AT302 Probescope Co Inc (USA)
B549D022 Probescope Co Inc (USA)
B4626-AT302 Probescope Co Inc (USA)
549D022 Probescope Co Inc (USA)
Related Parts
5910-00-081-1041INTERCHANGEABLE
CAPACITOR,FIXED,ELECTROLYTIC
NLW25-25
2520-00-149-7480INTERCHANGEABLE
RETAINER,CLUTCH SHA
1441
5331-00-257-3605INTERCHANGEABLE
O-RING
5910-00-901-8796INTERCHANGEABLE
CAPACITOR,FIXED,MICA DIELECTRIC
5930-00-955-9847INTERCHANGEABLE
SWITCH,ROTARY
2181743-1
6675-01-091-1926INTERCHANGEABLE
KIT,ALIGNMENT ASSEMBLY
1441
6105-01-154-6922INTERCHANGEABLE
MOTOR,ALTERNATING CURRENT
1441
3530-01-195-9178INTERCHANGEABLE
BOBBIN,SEWING MACHINE
1441
5950-01-293-8321INTERCHANGEABLE
COIL,ELECTRICAL
4810-200-04-00
7045-01-369-2697INTERCHANGEABLE
DISK,FLEXIBLE
7025-01-400-6158INTERCHANGEABLE
INTERFACE UNIT,AUTOMATIC DATA PR
AT-F3022-15
5305-01-415-8871INTERCHANGEABLE
SETSCREW
1441

Frequently Asked Questions

What is NSN 5985-00-921-7805?

NSN 5985-00-921-7805 is a Attenuator,variable, manufactured by Probescope Co Inc, classified under FSC 5985 (No Item Name Available). Status: active.

What are the part numbers for NSN 5985-00-921-7805?

NSN 5985-00-921-7805 has 7 cross-referenced part numbers: 4A1A4 (Probescope Co Inc), B2646 (Probescope Co Inc), 1441 (Probescope Co Inc), AT302 (Probescope Co Inc), B549D022 (Probescope Co Inc) and 2 more.

What NSN replaces 5985-00-921-7805?

There are 12 known substitutes for 5985-00-921-7805: 5910-00-081-1041, 2520-00-149-7480, 5331-00-257-3605 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 4A1A4?

Key specifications for 4A1A4: Terminal Type and Quantity: 2 WIRE LEAD AND 1 THREADED STUD; Application Design: TRANSMISSION LINE; Step Position Quantity: 11; Frequency Range: 10.000 HERTZ MINIMUM AND 500.000 KILOHERTZ MAXIMUM. 16 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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