The Waveguide Assembly, cataloged under National Stock Number 5985-01-200-2789, 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 Naval Sea Systems Command. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5985-01-200-2789 |
| Primary Part Number | 5186902-2 |
| Item Name | Waveguide Assembly |
| FSC / FSG | 5985 / 59 — Antennas, Waveguides, and Related Equipment |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Tubing Wall Construction Style | SEAMLESS SINGLE TUBING SEGMENT |
| Flange Inside Height | 0.372 INCHES MINIMUM AND 0.378 INCHES MAXIMUM FIRST FLANGE IN |
| Flange Quantity | 2 |
| Precious Material | SILVER |
| Voltage Standing Wave Ratio | 1.10 |
| Style Designator | STRAIGHT TYPE |
| Flexibility | FLEXIBLE SINGLE TUBING SEGMENT |
| Waveguide Inside Width | 0.747 INCHES MINIMUM AND 0.753 INCHES MAXIMUM IN |
| Cross-Sectional Shape Style | INTERNAL, RECTANGULAR EXTERNAL, RECTANGULAR |
| Operating Pressure | 10.0 POUNDS PER SQUARE INCH GAUGE (PSIG) MAXIMUM LBS |
| Flange Outside Height | 1.485 INCHES MINIMUM AND 1.515 INCHES MAXIMUM SECOND FLANGE IN |
| Flange Outside Height | 1.485 INCHES MINIMUM AND 1.515 INCHES MAXIMUM FIRST FLANGE IN |
| Flange Connecting Hole Diameter | 0.144 INCHES MINIMUM AND 0.147 INCHES MAXIMUM SECOND FLANGE ALL CONNECTION FACILITIES IN |
| Flange Inside Width | 0.747 INCHES MINIMUM AND 0.753 INCHES MAXIMUM FIRST FLANGE IN |
| Flange Inside Width | 0.747 INCHES MINIMUM AND 0.753 INCHES MAXIMUM SECOND FLANGE IN |
| Thread Direction | RIGHT-HAND FIRST FLANGE ALL CONNECTION FACILITIES |
| Waveguide Length | 3.950 INCHES MINIMUM AND 4.050 INCHES MAXIMUM IN |
| Nominal Thread Size | 0.138 INCHES FIRST FLANGE ALL CONNECTION FACILITIES IN |
| Waveguide Outside Height | 0.472 INCHES MINIMUM AND 0.478 INCHES MAXIMUM IN |
| Waveguide Outside Width | 0.847 INCHES MINIMUM AND 0.853 INCHES MAXIMUM IN |
| Flange Depth | 0.485 INCHES MINIMUM AND 0.515 INCHES MAXIMUM FIRST FLANGE IN |
| Flange Depth | 1.141 INCHES MINIMUM AND 1.171 INCHES MAXIMUM SECOND FLANGE IN |
| Flange Outside Width | 1.485 INCHES MINIMUM AND 1.515 INCHES MAXIMUM SECOND FLANGE IN |
| Flange Outside Width | 1.485 INCHES MINIMUM AND 1.515 INCHES MAXIMUM FIRST FLANGE IN |
| Insertion Loss in Decibels | 0.10 |
| Surface Treatment | SILVER ALL TUBING SEGMENT AND FLANGE INSIDE SURFACES |
| Surface Treatment | RUBBER SINGLE TUBING SEGMENT OUTSIDE SURFACES |
| Precious Material and Location | INTERNAL SURFACES SILVER |
| Waveguide Inside Height | 0.372 INCHES MINIMUM AND 0.378 INCHES MAXIMUM IN |
| Thread Class | 2B FIRST FLANGE ALL CONNECTION FACILITIES |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL D — Destroy Item |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
NSN 5985-01-200-2789 is a Waveguide Assembly, manufactured by Naval Sea Systems Command, classified under FSC 5985, Antennas, Waveguides, and Related Equipment. Status: active.
NSN 5985-01-200-2789 has 2 manufacturer part numbers on file: 5186902-2 (Naval Sea Systems Command), 222051 (Microtech Inc Dba Microtech Inc).
1 possible match (shared part number, not a government interchangeability claim): 5310-01-571-8310. Verify interchangeability with system specifications before substitution.
Key specifications for 5186902-2: Tubing Wall Construction Style: SEAMLESS SINGLE TUBING SEGMENT; Flange Inside Height: 0.372 INCHES MINIMUM AND 0.378 INCHES MAXIMUM FIRST FLANGE IN; Flange Quantity: 2; Precious Material: SILVER. 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 5985-01-200-2789 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.