The Waveguide Assembly, cataloged under National Stock Number 5985-01-420-1345, 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 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5985-01-420-1345 |
| Primary Part Number | RHB28-4A-5A-1.11-1.11-A |
| Item Name | Waveguide Assembly |
| FSC / FSG | 5985 / 59 — Antennas, Waveguides, and Related Equipment |
| Manufacturer | Frontgrade Technologies Inc. |
| Status | ACTIVE |
| Tubing Wall Construction Style | SEAMLESS SINGLE TUBING SEGMENT |
| Flange Inside Height | 0.140 INCHES NOMINAL SECOND FLANGE IN |
| Flange Inside Height | 0.140 INCHES NOMINAL FIRST FLANGE IN |
| Flange Quantity | 2 |
| Bend Angle in Deg | 90.0 SINGLE BEND H-PLANE |
| Style Designator | BEND TYPE |
| Waveguide Offset Distance | 1.110 INCHES NOMINAL IN |
| Flexibility | RIGID SINGLE TUBING SEGMENT |
| Flange Inside Diameter | 0.372 INCHES NOMINAL FIRST FLANGE IN |
| Flange Inside Diameter | 0.372 INCHES NOMINAL SECOND FLANGE IN |
| Waveguide Inside Width | 0.280 INCHES NOMINAL IN |
| Cross-Sectional Shape Style | INTERNAL, RECTANGULAR EXTERNAL, RECTANGULAR |
| 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 MINIMUM AND 0.118 INCHES MAXIMUM FIRST FLANGE SINGLE CONNECTION FACILITY IN |
| Flange Inside Width | 0.280 INCHES NOMINAL SECOND FLANGE IN |
| Flange Inside Width | 0.280 INCHES NOMINAL FIRST FLANGE IN |
| Thread Direction | RIGHT-HAND SECOND FLANGE SINGLE CONNECTION FACILITY |
| Nominal Thread Size | 0.112 INCHES SECOND FLANGE SINGLE CONNECTION FACILITY IN |
| Specification/standard Data | 20418-ES8123 MANUFACTURERS SPECIFICATION CONTROL |
| Waveguide Outside Height | 0.220 INCHES NOMINAL IN |
| Waveguide Outside Width | 0.360 INCHES NOMINAL IN |
| Flange Depth | 0.285 INCHES NOMINAL FIRST FLANGE IN |
| Flange Depth | 0.285 INCHES NOMINAL SECOND 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 |
| Thread Class | 2B SECOND FLANGE SINGLE CONNECTION FACILITY |
| Material | ALUMINUM SINGLE TUBING SEGMENT AND FLANGE |
| Flange Connecting Facility and Quantity | 4 THREADED HOLE(S) SECOND FLANGE SINGLE 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 |
|---|---|
| RHB28-4A-5A-1.11-1.11-A PRIMARY | Frontgrade Technologies Inc. (USA) |
| Reference | Meaning |
|---|---|
| ES8123-04 | 7/9 Vendor item drawing reference Drs Sustainment Systems, Inc. |
| ES8123-04 | 7/2 Vendor item drawing reference U.S. Government activity |
NSN 5985-01-420-1345 is a Waveguide Assembly, manufactured by Frontgrade Technologies Inc., classified under FSC 5985, Antennas, Waveguides, and Related Equipment. Status: active.
NSN 5985-01-420-1345 has 1 manufacturer part number on file: RHB28-4A-5A-1.11-1.11-A (Frontgrade Technologies Inc.).
Key specifications for RHB28-4A-5A-1.11-1.11-A: Tubing Wall Construction Style: SEAMLESS SINGLE TUBING SEGMENT; Flange Inside Height: 0.140 INCHES NOMINAL SECOND FLANGE IN; Flange Inside Height: 0.140 INCHES NOMINAL FIRST FLANGE IN; Flange Quantity: 2. 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 5985-01-420-1345 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.