PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

20551Adapter,waveguide

Waveline Inc · NSN 5985-01-275-7200 · FSC 5985 · No Item Name Available
Verified by PartsTable
NSN 5985-01-275-7200 — this item is cataloged by the U.S. Government under National Stock Number 5985-01-275-7200. Primary manufacturer part number: 20551.
Features
  • Adapter,waveguide — FSC 5985
  • Flange Connecting Facility and Quantity: 8 UNTHREADED HOLE(S) SECOND FLANGE SINGLE CONNECTION FACILITY
  • Surface Treatment: VARNISH SINGLE TUBING SEGMENT INSIDE SURFACES
  • Flange Connecting Hole Diameter: 0.251 INCHES MINIMUM FIRST FLANGE SECOND CONNECTION FACILITY IN
  • Adapter Length: 2.282 INCHES MINIMUM AND 2.302 INCHES MAXIMUM IN
  • Flange Inside Height: 0.586 INCHES MINIMUM AND 0.592 INCHES MAXIMUM SECOND FLANGE IN
  • Style Designator: WAVEGUIDE TO WAVEGUIDE
  • FSC Application Data: RADAR SYSTEM
Applications
  • Applications requiring Aluminum Alloy 6061 Single Tubing Segment and Flange construction
General Description

The Adapter,waveguide, cataloged under National Stock Number 5985-01-275-7200, 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 Waveline Inc. Government technical data includes 26 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. 11 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5985-01-275-7200
Primary Part Number20551
Item NameAdapter,waveguide
FSC / FSG5985 / 59 — No Item Name Available
ManufacturerWaveline Inc
StatusACTIVE
Flange Connecting Facility and Quantity8 UNTHREADED HOLE(S) SECOND FLANGE SINGLE CONNECTION FACILITY
Surface TreatmentVARNISH SINGLE TUBING SEGMENT INSIDE SURFACES
Flange Connecting Hole Diameter0.251 INCHES MINIMUM FIRST FLANGE SECOND CONNECTION FACILITY IN
Adapter Length2.282 INCHES MINIMUM AND 2.302 INCHES MAXIMUM IN
Flange Inside Height0.586 INCHES MINIMUM AND 0.592 INCHES MAXIMUM SECOND FLANGE IN
Style DesignatorWAVEGUIDE TO WAVEGUIDE
FSC Application DataRADAR SYSTEM
Flange Outside Width3.730 INCHES MINIMUM AND 3.770 INCHES MAXIMUM SECOND FLANGE IN
Surface TreatmentCHROMATE ZINC AND ENAMEL AND CHROMATE SINGLE TUBING SEGMENT OUTSIDE SURFACES
Flange Depth0.280 INCHES MINIMUM AND 0.340 INCHES MAXIMUM SECOND FLANGE IN
Flange Quantity2
Flange Outside Width3.580 INCHES MINIMUM AND 3.620 INCHES MAXIMUM FIRST FLANGE IN
Voltage Standing Wave Ratio1.07
Flange Depth0.280 INCHES MINIMUM AND 0.340 INCHES MAXIMUM FIRST FLANGE IN
Flange Inside Width2.837 INCHES MINIMUM AND 2.843 INCHES MAXIMUM FIRST FLANGE IN
Flange Connecting Hole Diameter0.255 INCHES MINIMUM SECOND FLANGE SINGLE CONNECTION FACILITY IN
Flange Outside Height1.780 INCHES MINIMUM AND 1.820 INCHES MAXIMUM FIRST FLANGE IN
Flange StyleCONTACT TYPE SECOND FLANGE
Flange Inside Height0.452 INCHES MINIMUM AND 0.458 INCHES MAXIMUM FIRST FLANGE IN
Flange Connecting Facility and Quantity4 UNTHREADED HOLE(S) FIRST FLANGE FIRST CONNECTION FACILITY
Flange Inside Width2.837 INCHES MINIMUM AND 2.843 INCHES MAXIMUM SECOND FLANGE IN
Flange Outside Height2.310 INCHES MINIMUM AND 2.350 INCHES MAXIMUM SECOND FLANGE IN
MaterialALUMINUM ALLOY 6061 SINGLE TUBING SEGMENT AND FLANGE
Flange Connecting Facility and Quantity2 UNTHREADED HOLE(S) FIRST FLANGE SECOND CONNECTION FACILITY
Flange StyleCONTACT TYPE FIRST FLANGE
Flange Connecting Hole Diameter0.276 INCHES MINIMUM AND 0.286 INCHES MAXIMUM FIRST FLANGE FIRST CONNECTION FACILITY IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 11
6105-00-168-3855 INTERCHANGEABLE
Stator,electrical
1730-00-169-08725813709-503 INTERCHANGEABLE
Cover,aircraft Ground Servicing
The Boeing Company
5935-00-258-4545625325PC5 INTERCHANGEABLE
Connector,receptacle,electrical
Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier
5355-00-355-61232055-1 INTERCHANGEABLE
Dial,scale
Mission Systems Davenport Inc.
4720-00-419-9381CH551 INTERCHANGEABLE
Hose,preformed
Gates Corporation
7310-00-474-589320551 INTERCHANGEABLE
Compartment Vent,steam Cooker
Cleveland Range, Llc
5950-00-646-3944986001-2 INTERCHANGEABLE
Transformer,pulse
Raytheon Company Dba Raytheon
6685-00-763-8706 INTERCHANGEABLE
Thermocouple,contact
5360-01-229-544320551 INTERCHANGEABLE
Spring,retainer
Real-Time Laboratories, Llc
5306-01-232-671820-551 INTERCHANGEABLE
Bolt,shoulder
Goodrich Corporation Div Collins Aerospace, Landing Systems (wheels & Brakes)
Cross-Reference Index
Part NumberManufacturer
20551 PRIMARY Waveline Inc (USA)
Related Parts
6105-00-168-3855INTERCHANGEABLE
STATOR,ELECTRICAL
1730-00-169-0872INTERCHANGEABLE
COVER,AIRCRAFT GROUND SERVICING
5813709-503
5935-00-258-4545INTERCHANGEABLE
CONNECTOR,RECEPTACLE,ELECTRICAL
625325PC5
5355-00-355-6123INTERCHANGEABLE
DIAL,SCALE
2055-1
4720-00-419-9381INTERCHANGEABLE
HOSE,PREFORMED
CH551
7310-00-474-5893INTERCHANGEABLE
COMPARTMENT VENT,STEAM COOKER
20551
5950-00-646-3944INTERCHANGEABLE
TRANSFORMER,PULSE
986001-2
6685-00-763-8706INTERCHANGEABLE
THERMOCOUPLE,CONTACT
5360-01-229-5443INTERCHANGEABLE
SPRING,RETAINER
20551
5306-01-232-6718INTERCHANGEABLE
BOLT,SHOULDER
20-551
4820-01-311-3925INTERCHANGEABLE
VALVE,CHECK
7080-5

Frequently Asked Questions

What is NSN 5985-01-275-7200?

NSN 5985-01-275-7200 is a Adapter,waveguide, manufactured by Waveline Inc, classified under FSC 5985 (No Item Name Available). Status: active.

What are the part numbers for NSN 5985-01-275-7200?

NSN 5985-01-275-7200 has 1 cross-referenced part number: 20551 (Waveline Inc).

What NSN replaces 5985-01-275-7200?

There are 11 known substitutes for 5985-01-275-7200: 6105-00-168-3855, 1730-00-169-0872, 5935-00-258-4545 and 8 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 20551?

Key specifications for 20551: Flange Connecting Facility and Quantity: 8 UNTHREADED HOLE(S) SECOND FLANGE SINGLE CONNECTION FACILITY; Surface Treatment: VARNISH SINGLE TUBING SEGMENT INSIDE SURFACES; Flange Connecting Hole Diameter: 0.251 INCHES MINIMUM FIRST FLANGE SECOND CONNECTION FACILITY IN; Adapter Length: 2.282 INCHES MINIMUM AND 2.302 INCHES MAXIMUM IN. 26 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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