The Switch,waveguide, cataloged under National Stock Number 5985-00-040-9100, 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 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5985-00-040-9100 |
| Primary Part Number | 20-5124 |
| Item Name | Switch,waveguide |
| FSC / FSG | 5985 / 59 — Antennas, Waveguides, and Related Equipment |
| Manufacturer | Microwave Development Laboratories, Inc. Dba Microwave Development Laboratories Inc |
| Status | ACTIVE |
| Waveguide Flange Type | CHOKE |
| Switching Time | 100.0 MILLISECONDS MS |
| Actuator Voltage in Volts | 115.0 NOMINAL |
| Switch Return Mechanism Type | FAIL-SAFE |
| Features Provided | OPEN OFF CIRCUIT TERMINATION |
| Coupling Position Quantity | 4 |
| Nominal Thread Size | 0.164 INCHES MOUNTING FACILITY HOLE IN |
| Switch Type | TRANSFER |
| Actuator Operating Method | RELAY |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) MOUNTING FACILITY HOLE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | N |
| Part Number | Manufacturer |
|---|---|
| 20-5124 PRIMARY | Microwave Development Laboratories, Inc. Dba Microwave Development Laboratories Inc (USA) |
NSN 5985-00-040-9100 is a Switch,waveguide, manufactured by Microwave Development Laboratories, Inc. Dba Microwave Development Laboratories Inc, classified under FSC 5985, Antennas, Waveguides, and Related Equipment. Status: active.
NSN 5985-00-040-9100 has 1 manufacturer part number on file: 20-5124 (Microwave Development Laboratories, Inc. Dba Microwave Development Laboratories Inc).
2 possible matches (shared part number, not a government interchangeability claim): 3020-00-443-4094, 4730-00-650-2178. Verify interchangeability with system specifications before substitution.
Key specifications for 20-5124: Waveguide Flange Type: CHOKE; Switching Time: 100.0 MILLISECONDS MS; Overall Height: 2.787 INCHES MAXIMUM IN; Actuator Voltage in Volts: 115.0 NOMINAL. 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.
NSN 5985-00-040-9100 has DEMIL Code B. 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.