The Adapter,waveguide, cataloged under National Stock Number 5985-00-404-5538, is classified within Federal Supply Class 5985 (Antennas, Waveguides, and Related Equipment) of the Electrical and Electronic Equipment Components group. The manufacturer of record is Northrop Grumman Systems Corporation Dba Electronic Systems. Government technical data includes 22 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5985-00-404-5538 |
| Primary Part Number | 990C727H01 |
| Item Name | Adapter,waveguide |
| FSC / FSG | 5985 / 59 — Antennas, Waveguides, and Related Equipment |
| Manufacturer | Northrop Grumman Systems Corporation Dba Electronic Systems |
| Status | ACTIVE |
| FSC Application Data | ANTENNAS,WAVEGUIDES,AND RELATED EQUIPMENT |
| Tubing Wall Construction Style | SEAMLESS SINGLE TUBING SEGMENT |
| Flange Inside Height | 0.397 INCHES MINIMUM AND 0.403 INCHES MAXIMUM SINGLE FLANGE IN |
| Flange Quantity | 1 |
| Voltage Standing Wave Ratio | 1.25 |
| Adapter Overall Width | 1.110 INCHES MINIMUM AND 1.130 INCHES MAXIMUM IN |
| Style Designator | WAVEGUIDE TO COAXIAL |
| Waveguide Inside Width | 0.896 INCHES MINIMUM AND 0.904 INCHES MAXIMUM IN |
| Cross-Sectional Shape Style | INTERNAL, RECTANGULAR EXTERNAL, RECTANGULAR |
| Flange Outside Height | 1.110 INCHES MINIMUM AND 1.130 INCHES MAXIMUM SINGLE FLANGE IN |
| Adapter Length | 2.900 INCHES NOMINAL IN |
| Flange Inside Width | 0.897 INCHES MINIMUM AND 0.903 INCHES MAXIMUM SINGLE FLANGE IN |
| Waveguide Outside Height | 0.496 INCHES MINIMUM AND 0.504 INCHES MAXIMUM IN |
| Waveguide Outside Width | 0.996 INCHES MINIMUM AND 1.004 INCHES MAXIMUM IN |
| Flange Depth | 0.245 INCHES NOMINAL SINGLE FLANGE IN |
| Flange Outside Width | 1.110 INCHES MINIMUM AND 1.130 INCHES MAXIMUM SINGLE FLANGE IN |
| Surface Treatment | CHROMATE ALL TUBING SEGMENT AND FLANGE ALL SURFACES |
| Surface Treatment | PRIMER AND ENAMEL ALL TUBING SEGMENT AND FLANGE OUTSIDE SURFACES |
| Waveguide Inside Height | 0.396 INCHES MINIMUM AND 0.404 INCHES MAXIMUM IN |
| Adapter Height | 0.930 INCHES MINIMUM AND 0.950 INCHES MAXIMUM IN |
| Material | ALUMINUM ALLOY ALL TUBING SEGMENT AND FLANGE |
| Flange Connecting Facility and Quantity | 4 UNTHREADED HOLE(S) SINGLE FLANGE ALL CONNECTION FACILITIES |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 990C727H01 | Omega Laboratories Inc (USA) |
| 990C727H01 PRIMARY | Northrop Grumman Systems Corporation Dba Electronic Systems (USA) |
| 60617 | Waveline Inc (USA) |
| Reference | Meaning |
|---|---|
| 990C727H01 | 5/2 Secondary reference U.S. Government activity |
| 990C727H01 | 5/9 Secondary reference Skyworks Solutions, Inc. |
NSN 5985-00-404-5538 is a Adapter,waveguide, manufactured by Northrop Grumman Systems Corporation Dba Electronic Systems, classified under FSC 5985, Antennas, Waveguides, and Related Equipment. Status: active.
NSN 5985-00-404-5538 has 3 manufacturer part numbers on file: 990C727H01 (Omega Laboratories Inc), 990C727H01 (Northrop Grumman Systems Corporation Dba Electronic Systems), 60617 (Waveline Inc).
4 possible matches (shared part number, not a government interchangeability claim): 5970-00-682-8869, 5905-01-167-6025, 3120-01-167-8323. Verify interchangeability with system specifications before substitution.
Key specifications for 990C727H01: FSC Application Data: ANTENNAS,WAVEGUIDES,AND RELATED EQUIPMENT; Tubing Wall Construction Style: SEAMLESS SINGLE TUBING SEGMENT; Flange Inside Height: 0.397 INCHES MINIMUM AND 0.403 INCHES MAXIMUM SINGLE FLANGE IN; Flange Quantity: 1. 22 specifications are documented in the U.S. Government catalog.
Possible hazard — SDS may be required (DLA HMIC P). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.