The Waveguide Assembly, cataloged under National Stock Number 5985-00-688-6799, 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 Us Army Aviation and Missile Command. Government technical data includes 30 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government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 | 5985-00-688-6799 |
| Primary Part Number | 9166401 |
| Item Name | Waveguide Assembly |
| FSC / FSG | 5985 / 59 — Antennas, Waveguides, and Related Equipment |
| Manufacturer | Us Army Aviation and Missile Command |
| Status | ACTIVE |
| Tubing Wall Construction Style | SEAMLESS SINGLE TUBING SEGMENT |
| Flange Inside Height | 3.630 INCHES NOMINAL ALL FLANGES IN |
| Flange Quantity | 2 |
| Precious Material | SILVER |
| Voltage Standing Wave Ratio | 1.10 |
| Style Designator | OFFSET BEND TYPE |
| Flexibility | FLEXIBLE SINGLE TUBING SEGMENT |
| Waveguide Inside Width | 6.500 INCHES NOMINAL IN |
| Cross-Sectional Shape Style | INTERNAL, RECTANGULAR EXTERNAL, RECTANGULAR |
| Flange Outside Height | 5.438 INCHES NOMINAL ALL FLANGES IN |
| Flange Connecting Hole Diameter | 0.250 INCHES NOMINAL FIRST FLANGE ALL CONNECTION FACILITIES IN |
| Flange Connecting Hole Diameter | 0.330 INCHES NOMINAL SECOND FLANGE ALL CONNECTION FACILITIES IN |
| Waveguide Center to Center Distance | 8.000 INCHES NOMINAL IN |
| Flange Inside Width | 6.880 INCHES NOMINAL ALL FLANGES IN |
| Waveguide Length | 4.000 FEET NOMINAL FT |
| Waveguide Outside Height | 3.410 INCHES NOMINAL IN |
| Waveguide Outside Width | 6.660 INCHES NOMINAL IN |
| Flange Depth | 1.000 INCHES NOMINAL ALL FLANGES IN |
| Flange Outside Width | 8.688 INCHES NOMINAL ALL FLANGES IN |
| Tubing Twist Type | STRAIGHT TWIST SINGLE TUBING SEGMENT |
| Tubing Twist Angle in Deg | 15.0 SINGLE TUBING SEGMENT |
| Surface Treatment | SILVER ALL FLANGE INSIDE SURFACES |
| Surface Treatment | SILVER SINGLE TUBING SEGMENT INSIDE SURFACES |
| Surface Treatment | SILVER ALL COUPLING INSIDE SURFACES |
| Precious Material and Location | FLANGE AND TUBING AND COUPLING SURFACES SILVER |
| Waveguide Inside Height | 3.250 INCHES NOMINAL IN |
| Material | METAL NONFERROUS/D SINGLE TUBING SEGMENT |
| Material | METAL NONFERROUS/D ALL FLANGE |
| Flange Connecting Facility and Quantity | 12 UNTHREADED HOLE(S) FIRST FLANGE ALL CONNECTION FACILITIES |
| Flange Connecting Facility and Quantity | 12 UNTHREADED HOLE(S) SECOND 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 5985-00-688-6799 is a Waveguide Assembly, manufactured by Us Army Aviation and Missile Command, classified under FSC 5985, Antennas, Waveguides, and Related Equipment. Status: active.
NSN 5985-00-688-6799 has 3 manufacturer part numbers on file: 48045 (Mega Industries Inc Mega Microwave Div), 9166401 (Us Army Aviation and Missile Command), 9166401 (Microtech Inc Dba Microtech Inc).
3 possible matches (shared part number, not a government interchangeability claim): 5136-01-113-9568, 2920-01-257-6194, 4820-01-311-8135. Verify interchangeability with system specifications before substitution.
Key specifications for 9166401: Tubing Wall Construction Style: SEAMLESS SINGLE TUBING SEGMENT; Flange Inside Height: 3.630 INCHES NOMINAL ALL FLANGES 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 5985-00-688-6799 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.