PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

X58C4665Adapter,waveguide

Air Force Lifecycle Management Center Electronic Components (aflcmc/ezss) · NSN 5985-00-623-3691 · FSC 5985 · No Item Name Available
Verified by PartsTable
NSN 5985-00-623-3691 — this item is cataloged by the U.S. Government under National Stock Number 5985-00-623-3691. Primary manufacturer part number: X58C4665.
Features
  • Adapter,waveguide — FSC 5985
  • Material: METAL SINGLE TUBING SEGMENT AND FLANGE
  • Flange Quantity: 1
  • Flange Connecting Facility and Quantity: 4 UNTHREADED HOLE(S) SINGLE FLANGE SINGLE CONNECTION FACILITY
  • Style Designator: WAVEGUIDE TO COAXIAL
  • Bend Angle in Deg: 90.0 SINGLE BEND E-PLANE
  • Flange Outside Width: 0.65625 INCHES NOMINAL SINGLE FLANGE IN
  • Flange Connecting Hole Diameter: 0.09375 INCHES NOMINAL SINGLE FLANGE SINGLE CONNECTION FACILITY IN
Applications
  • Applications requiring Metal Single Tubing Segment and Flange construction
General Description

The Adapter,waveguide, cataloged under National Stock Number 5985-00-623-3691, 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 Air Force Lifecycle Management Center Electronic Components (aflcmc/ezss). Government technical data includes 13 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 6 commercial cross-references from 5 manufacturers, enabling identification through both NSN and commercial part number lookups. 8 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN5985-00-623-3691
Primary Part NumberX58C4665
Item NameAdapter,waveguide
FSC / FSG5985 / 59 — No Item Name Available
ManufacturerAir Force Lifecycle Management Center Electronic Components (aflcmc/ezss)
StatusCANCELLED
MaterialMETAL SINGLE TUBING SEGMENT AND FLANGE
Flange Quantity1
Flange Connecting Facility and Quantity4 UNTHREADED HOLE(S) SINGLE FLANGE SINGLE CONNECTION FACILITY
Style DesignatorWAVEGUIDE TO COAXIAL
Bend Angle in Deg90.0 SINGLE BEND E-PLANE
Flange Outside Width0.65625 INCHES NOMINAL SINGLE FLANGE IN
Flange Connecting Hole Diameter0.09375 INCHES NOMINAL SINGLE FLANGE SINGLE CONNECTION FACILITY IN
Special Test FeaturesUSED W/12.4 TO 18 KILOMEGACYCLES VARIABLE ATTENUATOR
Flange Outside Height0.65625 INCHES NOMINAL SINGLE FLANGE IN
FSC Application DataTEST SETS,ELECTRONIC SYSTEMS,EXCEPT SPECIALLY DESIGNED
Adapter Length3.000 INCHES NOMINAL IN
Flange StyleCOVER TYPE SINGLE FLANGE
Reference Number Differentiating CharacteristicsAS MANUFACTURED BY POLARAO ELECTRONICS CORP.,REFERENCE NO. C105544
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 8
6685-00-530-014510685-0 INTERCHANGEABLE
Gage,vacuum,indicating
Ametek, Inc. Div Aerospace & Defense
4810-00-724-8586152431 INTERCHANGEABLE
Actuator,electromechanical,rotar
Meggitt North Hollywood Inc
2510-00-737-23767372376 INTERCHANGEABLE
Clip Front Spring
U S Army Tank Automotive Command Amsta-Im-Mm
5910-00-902-118639D118G050HP4 INTERCHANGEABLE
Capacitor,fixed,electrolytic
Sprague Electric Co World Hqs
4810-01-018-91183166 INTERCHANGEABLE
Diaphragm,valve,flat
Pentair Filtration Solutions, Llc
4920-01-209-5085152431 INTERCHANGEABLE
Test Station,electrical-Electron
Lockheed Martin Corp Electronics and Missiles Div
6515-01-516-14752093137 INTERCHANGEABLE
Switch,electrical Safety Analyze
Fluke Biomedical Corporation
6685-01-652-4171100227 INTERCHANGEABLE
Sensor,ambient Temperature
American Metal Bearing Co Dba Amb Engineering & Machining Solutions
Cross-Reference Index
Part NumberManufacturer
X58C4665 Air Force Lifecycle Management Center Electronic Components (aflcmc/ezss) (USA)
152431 Sierra Technologies Inc Garden City Div (USA)
C105544 Rohde & Schwarz Usa, Inc. (USA)
UG-1241/UPM-84 Joint Electronics Type Designation System (USA)
K89200420 Entron Industries Limited Partnership Dba Entron Industries Property Div (USA)
100227 Sierra Technologies Inc Garden City Div (USA)
Related Parts
6685-00-530-0145INTERCHANGEABLE
GAGE,VACUUM,INDICATING
10685-0
4810-00-724-8586INTERCHANGEABLE
ACTUATOR,ELECTROMECHANICAL,ROTAR
152431
2510-00-737-2376INTERCHANGEABLE
CLIP FRONT SPRING
7372376
5910-00-902-1186INTERCHANGEABLE
CAPACITOR,FIXED,ELECTROLYTIC
39D118G050HP4
4810-01-018-9118INTERCHANGEABLE
DIAPHRAGM,VALVE,FLAT
3166
4920-01-209-5085INTERCHANGEABLE
TEST STATION,ELECTRICAL-ELECTRON
152431
6515-01-516-1475INTERCHANGEABLE
SWITCH,ELECTRICAL SAFETY ANALYZE
2093137
6685-01-652-4171INTERCHANGEABLE
SENSOR,AMBIENT TEMPERATURE
100227

Frequently Asked Questions

What is NSN 5985-00-623-3691?

NSN 5985-00-623-3691 is a Adapter,waveguide, manufactured by Air Force Lifecycle Management Center Electronic Components (aflcmc/ezss), classified under FSC 5985 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 5985-00-623-3691?

NSN 5985-00-623-3691 has 6 cross-referenced part numbers: X58C4665 (Air Force Lifecycle Management Center Electronic Components (aflcmc/ezss)), 152431 (Sierra Technologies Inc Garden City Div), C105544 (Rohde & Schwarz Usa, Inc.), UG-1241/UPM-84 (Joint Electronics Type Designation System), K89200420 (Entron Industries Limited Partnership Dba Entron Industries Property Div) and 1 more.

What NSN replaces 5985-00-623-3691?

There are 8 known substitutes for 5985-00-623-3691: 6685-00-530-0145, 4810-00-724-8586, 2510-00-737-2376 and 5 more. Verify interchangeability with system specifications before substitution.

What are the specifications of X58C4665?

Key specifications for X58C4665: Material: METAL SINGLE TUBING SEGMENT AND FLANGE; Flange Quantity: 1; Flange Connecting Facility and Quantity: 4 UNTHREADED HOLE(S) SINGLE FLANGE SINGLE CONNECTION FACILITY; Style Designator: WAVEGUIDE TO COAXIAL. 15 total characteristics are documented in the Federal Logistics Information System.

Is NSN 5985-00-623-3691 still in active supply?

NSN 5985-00-623-3691 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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