The Waveguide Assembly, cataloged under National Stock Number 5985-01-274-4139, 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 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5985-01-274-4139 |
| Primary Part Number | 2901456-23 |
| 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 | 0.400 INCHES NOMINAL ALL FLANGES IN |
| Flange Quantity | 2 |
| Bend Angle in Deg | 90.0 SINGLE BEND E-PLANE |
| Style Designator | BEND TYPE |
| Waveguide Offset Distance | 1.550 INCHES NOMINAL IN |
| Flexibility | RIGID SINGLE TUBING SEGMENT |
| Waveguide Inside Width | 2.840 INCHES NOMINAL IN |
| Cross-Sectional Shape Style | INTERNAL, RECTANGULAR EXTERNAL, RECTANGULAR |
| Flange Outside Height | 1.800 INCHES NOMINAL ALL FLANGES IN |
| Flange Connecting Hole Diameter | 0.251 INCHES NOMINAL FIRST FLANGE THIRD CONNECTION FACILITY IN |
| Flange Connecting Hole Diameter | 0.251 INCHES NOMINAL SECOND FLANGE SECOND CONNECTION FACILITY IN |
| Flange Connecting Hole Diameter | 0.281 INCHES NOMINAL FIRST FLANGE SECOND CONNECTION FACILITY IN |
| Flange Connecting Hole Diameter | 0.281 INCHES NOMINAL SECOND FLANGE FIRST CONNECTION FACILITY IN |
| Flange Inside Width | 2.840 INCHES NOMINAL ALL FLANGES IN |
| Thread Direction | RIGHT-HAND FIRST FLANGE FIRST CONNECTION FACILITY |
| Nominal Thread Size | 0.250 INCHES FIRST FLANGE FIRST CONNECTION FACILITY IN |
| Waveguide Outside Height | 0.560 INCHES NOMINAL IN |
| Waveguide Outside Width | 3.000 INCHES NOMINAL IN |
| Flange Depth | 0.310 INCHES NOMINAL ALL FLANGES IN |
| Flange Outside Width | 3.600 INCHES NOMINAL ALL FLANGES IN |
| Waveguide Inside Height | 0.400 INCHES NOMINAL IN |
| Thread Class | 3B FIRST FLANGE FIRST CONNECTION FACILITY |
| Material | ALUMINUM SINGLE TUBING SEGMENT AND FLANGE |
| Flange Connecting Facility and Quantity | 2 UNTHREADED HOLE(S) SECOND FLANGE SECOND CONNECTION FACILITY |
| Flange Connecting Facility and Quantity | 2 UNTHREADED HOLE(S) FIRST FLANGE SECOND CONNECTION FACILITY |
| Flange Connecting Facility and Quantity | 1 UNTHREADED HOLE(S) FIRST FLANGE THIRD CONNECTION FACILITY |
| Flange Connecting Facility and Quantity | 3 THREADED HOLE(S) FIRST FLANGE FIRST CONNECTION FACILITY |
| Flange Connecting Facility and Quantity | 4 UNTHREADED HOLE(S) SECOND FLANGE FIRST CONNECTION FACILITY |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) FIRST FLANGE FIRST CONNECTION FACILITY |
| 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 |
|---|---|
| 2901456-23 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 55235-23 | 5/9 Secondary reference U.S. Government activity |
| 2901456-23 | 5/9 Secondary reference Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier |
| 122337-5 | C/1 Advisory reference — outside the item-of-supply concept Frontgrade Technologies Inc. |
| 122337-5 | 5/9 Secondary reference U.S. Government activity |
NSN 5985-01-274-4139 is a Waveguide Assembly, manufactured by Naval Sea Systems Command, classified under FSC 5985, Antennas, Waveguides, and Related Equipment. Status: active.
NSN 5985-01-274-4139 has 1 manufacturer part number on file: 2901456-23 (Naval Sea Systems Command).
1 possible match (shared part number, not a government interchangeability claim): 5940-01-518-1036. Verify interchangeability with system specifications before substitution.
Key specifications for 2901456-23: Tubing Wall Construction Style: SEAMLESS SINGLE TUBING SEGMENT; Flange Inside Height: 0.400 INCHES NOMINAL ALL FLANGES IN; Flange Quantity: 2; Bend Angle in Deg: 90.0 SINGLE BEND E-PLANE. 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 5985-01-274-4139 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.