The Waveguide Assembly, cataloged under National Stock Number 5985-00-538-5352, 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 Lockheed Martin Corporation Div Rms. Government technical data includes 30 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 5985-00-538-5352 |
| Primary Part Number | 176B785 |
| Item Name | Waveguide Assembly |
| FSC / FSG | 5985 / 59 — Antennas, Waveguides, and Related Equipment |
| Manufacturer | Lockheed Martin Corporation Div Rms |
| Status | ACTIVE |
| FSC Application Data | ANTENNAS,WAVEGUIDES,AND RELATED EQUIPMENT |
| Tubing Wall Construction Style | SEAMLESS SINGLE TUBING SEGMENT |
| Flange Inside Height | 1.494 INCHES MINIMUM AND 1.506 INCHES MAXIMUM FIRST FLANGE IN |
| Flange Inside Height | 1.502 INCHES MINIMUM AND 1.505 INCHES MAXIMUM SECOND FLANGE IN |
| Flange Quantity | 2 |
| Precious Material | SILVER |
| Style Designator | STRAIGHT TYPE |
| Flexibility | FLEXIBLE SINGLE TUBING SEGMENT |
| Waveguide Inside Width | 2.334 INCHES MINIMUM AND 2.846 INCHES MAXIMUM IN |
| Cross-Sectional Shape Style | INTERNAL, RECTANGULAR EXTERNAL, RECTANGULAR |
| Flange Connecting Hole Diameter | 0.257 INCHES MINIMUM AND 0.260 INCHES MAXIMUM SECOND FLANGE ALL CONNECTION FACILITIES IN |
| Flange Inside Width | 2.834 INCHES MINIMUM AND 2.846 INCHES MAXIMUM FIRST FLANGE IN |
| Flange Inside Width | 3.002 INCHES MINIMUM AND 3.005 INCHES MAXIMUM SECOND FLANGE IN |
| Thread Direction | RIGHT-HAND FIRST FLANGE ALL CONNECTION FACILITIES |
| Waveguide Length | 2.000 FEET NOMINAL FT |
| Nominal Thread Size | 0.250 INCHES FIRST FLANGE ALL CONNECTION FACILITIES IN |
| Waveguide Outside Height | 1.494 INCHES MINIMUM AND 1.506 INCHES MAXIMUM IN |
| Waveguide Outside Width | 2.994 INCHES MINIMUM AND 3.006 INCHES MAXIMUM IN |
| Flange Depth | 0.735 INCHES MINIMUM AND 0.765 INCHES MAXIMUM SECOND FLANGE IN |
| Flange Depth | 1.235 INCHES MINIMUM AND 1.265 INCHES MAXIMUM FIRST FLANGE IN |
| Insertion Loss in Decibels | 0.05 |
| Surface Treatment | SILVER ALL FLANGE INSIDE SURFACES |
| Precious Material and Location | FLANGE SURFACE SILVER |
| Waveguide Inside Height | 1.334 INCHES MINIMUM AND 1.346 INCHES MAXIMUM IN |
| Thread Class | 2B FIRST FLANGE ALL CONNECTION FACILITIES |
| Thread Quantity Per Inch | 20 FIRST FLANGE ALL CONNECTION FACILITIES |
| Material | COPPER ALLOY ALL TUBING SEGMENT AND FLANGE |
| Flange Connecting Facility and Quantity | 8 UNTHREADED HOLE(S) SECOND FLANGE ALL CONNECTION FACILITIES |
| Flange Connecting Facility and Quantity | 8 THREADED HOLE(S) FIRST FLANGE ALL CONNECTION FACILITIES |
| Flange Outside Diameter | 5.298 INCHES MINIMUM AND 5.328 INCHES MAXIMUM SECOND FLANGE IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL D — Destroy Item |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 176B785 PRIMARY | Lockheed Martin Corporation Div Rms (USA) |
| 221790 | Microtech Inc Dba Microtech Inc (USA) |
| Reference | Meaning |
|---|---|
| CG945U | 5/2 Secondary reference U.S. Government activity |
| 176B785 | 5/9 Secondary reference Microtech Inc Dba Microtech Inc |
| 176B785 | 5/9 Secondary reference Reese Manufacturing Inc |
NSN 5985-00-538-5352 is a Waveguide Assembly, manufactured by Lockheed Martin Corporation Div Rms, classified under FSC 5985, Antennas, Waveguides, and Related Equipment. Status: active.
NSN 5985-00-538-5352 has 2 manufacturer part numbers on file: 176B785 (Lockheed Martin Corporation Div Rms), 221790 (Microtech Inc Dba Microtech Inc).
2 possible matches (shared part number, not a government interchangeability claim): 6515-01-376-5161, 5340-01-533-8328. Verify interchangeability with system specifications before substitution.
Key specifications for 176B785: FSC Application Data: ANTENNAS,WAVEGUIDES,AND RELATED EQUIPMENT; Tubing Wall Construction Style: SEAMLESS SINGLE TUBING SEGMENT; Flange Inside Height: 1.494 INCHES MINIMUM AND 1.506 INCHES MAXIMUM FIRST FLANGE IN; Flange Inside Height: 1.502 INCHES MINIMUM AND 1.505 INCHES MAXIMUM SECOND FLANGE IN. 30 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.
NSN 5985-00-538-5352 has DEMIL Code D. Demilitarization may be required before disposal or transfer to non-military entities.
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.