The Adapter,waveguide, cataloged under National Stock Number 5985-01-445-2781, 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 Microwave Development Laboratories, Inc. Dba Microwave Development Laboratories Inc. Government technical data includes 10 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5985-01-445-2781 |
| Primary Part Number | A90BH59 |
| Item Name | Adapter,waveguide |
| FSC / FSG | 5985 / 59 — Antennas, Waveguides, and Related Equipment |
| Manufacturer | Microwave Development Laboratories, Inc. Dba Microwave Development Laboratories Inc |
| Status | ACTIVE |
| Tubing Wall Construction Style | SEAMLESS SINGLE TUBING SEGMENT |
| Bend Angle in Deg | 90.0 SINGLE BEND E-PLANE |
| Style Designator | WAVEGUIDE TO WAVEGUIDE |
| Waveguide Inside Width | 0.900 INCHES NOMINAL IN |
| Cross-Sectional Shape Style | INTERNAL, RECTANGULAR EXTERNAL, RECTANGULAR |
| Adapter Length | 1.170 INCHES NOMINAL IN |
| Waveguide Outside Height | 0.380 INCHES NOMINAL IN |
| Waveguide Outside Width | 1.020 INCHES NOMINAL IN |
| Waveguide Inside Height | 0.200 INCHES NOMINAL IN |
| Material | ALUMINUM ALLOY SINGLE COUPLING |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| A90BH59 PRIMARY | Microwave Development Laboratories, Inc. Dba Microwave Development Laboratories Inc (USA) |
| Reference | Meaning |
|---|---|
| BH90-901-200T | 5/9 Secondary reference U.S. Government activity |
| 900946-1 | 7/2 Vendor item drawing reference U.S. Government activity |
NSN 5985-01-445-2781 is a Adapter,waveguide, manufactured by Microwave Development Laboratories, Inc. Dba Microwave Development Laboratories Inc, classified under FSC 5985, Antennas, Waveguides, and Related Equipment. Status: active.
NSN 5985-01-445-2781 has 1 manufacturer part number on file: A90BH59 (Microwave Development Laboratories, Inc. Dba Microwave Development Laboratories Inc).
Key specifications for A90BH59: Tubing Wall Construction Style: SEAMLESS SINGLE TUBING SEGMENT; Bend Angle in Deg: 90.0 SINGLE BEND E-PLANE; Style Designator: WAVEGUIDE TO WAVEGUIDE; Waveguide Inside Width: 0.900 INCHES NOMINAL IN. 10 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.
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.