The Adapter,waveguide, cataloged under National Stock Number 5985-01-399-1602, 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 - Mitchel Field. Government technical data includes 29 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5985-01-399-1602 |
| Primary Part Number | 1218260-301 |
| Item Name | Adapter,waveguide |
| FSC / FSG | 5985 / 59 — Antennas, Waveguides, and Related Equipment |
| Manufacturer | Lockheed Martin Corporation Div Rms - Mitchel Field |
| Status | ACTIVE |
| Tubing Wall Construction Style | SEAMLESS ALL TUBING SEGMENT |
| Flange Inside Height | 1.334 INCHES MINIMUM AND 1.346 INCHES MAXIMUM FIRST FLANGE IN |
| Flange Inside Height | 1.335 INCHES MINIMUM AND 1.345 INCHES MAXIMUM SECOND FLANGE IN |
| Flange Quantity | 2 |
| Nominal Thread Length | 0.175 INCHES FIRST FLANGE ALL CONNECTION FACILITIES IN |
| Style Designator | WAVEGUIDE TO WAVEGUIDE |
| Waveguide Inside Width | 2.834 INCHES MINIMUM AND 2.846 INCHES MAXIMUM IN |
| Cross-Sectional Shape Style | INTERNAL, RECTANGULAR EXTERNAL, RECTANGULAR |
| Flange Outside Height | 2.980 INCHES MINIMUM AND 3.020 INCHES MAXIMUM SECOND FLANGE IN |
| Adapter Length | 3.000 INCHES NOMINAL IN |
| Flange Connecting Hole Diameter | 0.257 INCHES MINIMUM AND 0.262 INCHES MAXIMUM SECOND FLANGE ALL CONNECTION FACILITIES IN |
| Flange Inside Width | 2.835 INCHES MINIMUM AND 2.845 INCHES MAXIMUM SECOND FLANGE IN |
| Thread Direction | RIGHT-HAND FIRST FLANGE ALL CONNECTION FACILITIES |
| 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 IN |
| Flange Depth | 1.235 INCHES MINIMUM AND 1.265 INCHES MAXIMUM FIRST FLANGE IN |
| Flange Depth | 0.670 INCHES MINIMUM AND 0.710 INCHES MAXIMUM SECOND FLANGE IN |
| Flange Outside Width | 4.480 INCHES MINIMUM AND 4.520 INCHES MAXIMUM SECOND FLANGE IN |
| Surface Treatment | CHROMATE ALL TUBING SEGMENT AND FLANGE ALL SURFACES |
| Waveguide Inside Height | 1.334 INCHES MINIMUM AND 1.346 INCHES MAXIMUM IN |
| Thread Class | 2B FIRST FLANGE ALL CONNECTION FACILITIES |
| Material | ALUMINUM 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 FIRST FLANGE IN |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) FIRST FLANGE ALL CONNECTION FACILITIES |
| Flange Style | CHOKE TYPE FIRST FLANGE |
| Flange Style | CONTACT TYPE SECOND FLANGE |
| 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 |
|---|---|
| 1218260-301 PRIMARY | Lockheed Martin Corporation Div Rms - Mitchel Field (USA) |
| Reference | Meaning |
|---|---|
| 1218260-301 | 5/9 Secondary reference Lockheed Martin Corporation Div Rms |
NSN 5985-01-399-1602 is a Adapter,waveguide, manufactured by Lockheed Martin Corporation Div Rms - Mitchel Field, classified under FSC 5985, Antennas, Waveguides, and Related Equipment. Status: active.
NSN 5985-01-399-1602 has 1 manufacturer part number on file: 1218260-301 (Lockheed Martin Corporation Div Rms - Mitchel Field).
Key specifications for 1218260-301: Tubing Wall Construction Style: SEAMLESS ALL TUBING SEGMENT; Flange Inside Height: 1.334 INCHES MINIMUM AND 1.346 INCHES MAXIMUM FIRST FLANGE IN; Flange Inside Height: 1.335 INCHES MINIMUM AND 1.345 INCHES MAXIMUM SECOND FLANGE IN; Flange Quantity: 2. 29 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 5985-01-399-1602 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.