The Waveguide Assembly, cataloged under National Stock Number 5985-00-003-3620, 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 Frontgrade Technologies Inc.. Government technical data includes 26 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5985-00-003-3620 |
| Primary Part Number | 115603 |
| Item Name | Waveguide Assembly |
| FSC / FSG | 5985 / 59 — Antennas, Waveguides, and Related Equipment |
| Manufacturer | Frontgrade Technologies Inc. |
| Status | ACTIVE |
| FSC Application Data | RADAR SET,AIRBORNE |
| Tubing Wall Construction Style | SEAMLESS SINGLE TUBING SEGMENT |
| Flange Inside Height | 0.140 INCHES NOMINAL FIRST FLANGE IN |
| Flange Inside Height | 0.181 INCHES NOMINAL SECOND FLANGE IN |
| Flange Quantity | 2 |
| Voltage Standing Wave Ratio | 1.25 |
| Flange Inside Diameter | 0.250 INCHES NOMINAL FIRST FLANGE IN |
| Waveguide Inside Width | 0.280 INCHES NOMINAL IN |
| Cross-Sectional Shape Style | INTERNAL, RECTANGULAR EXTERNAL, RECTANGULAR |
| Operating Pressure | 60.0 POUNDS PER SQUARE INCH GAUGE (PSIG) MAXIMUM LBS |
| Flange Outside Height | 0.750 INCHES NOMINAL SECOND FLANGE IN |
| Flange Outside Height | 0.750 INCHES NOMINAL FIRST FLANGE IN |
| Flange Connecting Hole Diameter | 0.116 INCHES NOMINAL SINGLE FLANGE SINGLE CONNECTION FACILITY IN |
| Flange Inside Width | 0.280 INCHES NOMINAL FIRST FLANGE IN |
| Flange Inside Width | 0.362 INCHES NOMINAL SECOND FLANGE IN |
| Waveguide Outside Height | 0.220 INCHES NOMINAL IN |
| Waveguide Outside Width | 0.360 INCHES NOMINAL IN |
| Flange Depth | 0.188 INCHES NOMINAL SECOND FLANGE IN |
| Flange Depth | 0.210 INCHES NOMINAL FIRST FLANGE IN |
| Flange Outside Width | 0.750 INCHES NOMINAL SECOND FLANGE IN |
| Flange Outside Width | 0.750 INCHES NOMINAL FIRST FLANGE IN |
| Waveguide Inside Height | 0.140 INCHES NOMINAL IN |
| Material | SILVER SINGLE TUBING SEGMENT |
| Flange Connecting Facility and Quantity | 4 UNTHREADED HOLE(S) SINGLE FLANGE SINGLE CONNECTION FACILITY |
| Flange Style | CHOKE TYPE FIRST FLANGE |
| Flange Style | COVER 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 |
|---|---|
| 115603 PRIMARY | Frontgrade Technologies Inc. (USA) |
| Reference | Meaning |
|---|---|
| 215-27659-2 | 7/2 Vendor item drawing reference U.S. Government activity |
| 115603 | 5/9 Secondary reference U.S. Government activity |
NSN 5985-00-003-3620 is a Waveguide Assembly, manufactured by Frontgrade Technologies Inc., classified under FSC 5985, Antennas, Waveguides, and Related Equipment. Status: active.
NSN 5985-00-003-3620 has 1 manufacturer part number on file: 115603 (Frontgrade Technologies Inc.).
1 possible match (shared part number, not a government interchangeability claim): 5340-01-735-0238. Verify interchangeability with system specifications before substitution.
Key specifications for 115603: FSC Application Data: RADAR SET,AIRBORNE; Tubing Wall Construction Style: SEAMLESS SINGLE TUBING SEGMENT; Flange Inside Height: 0.140 INCHES NOMINAL FIRST FLANGE IN; Flange Inside Height: 0.181 INCHES NOMINAL SECOND FLANGE IN. 26 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 5985-00-003-3620 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.