The Waveguide Assembly, cataloged under National Stock Number 5985-01-342-4020, 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 Engineering Corporation. 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5985-01-342-4020 |
| Primary Part Number | R170-3.75 |
| Item Name | Waveguide Assembly |
| FSC / FSG | 5985 / 59 — Antennas, Waveguides, and Related Equipment |
| Manufacturer | Microwave Engineering Corporation |
| Status | ACTIVE |
| FSC Application Data | ANTENNAS,WAVEGUIDE AND RELATED EQUIPMENT |
| Tubing Wall Construction Style | SEAMLESS SINGLE TUBING SEGMENT |
| Flange Inside Height | 0.318 INCHES MINIMUM AND 0.324 INCHES MAXIMUM ALL FLANGES IN |
| Flange Quantity | 2 |
| Voltage Standing Wave Ratio | 1.26 |
| Style Designator | STRAIGHT TYPE |
| Flexibility | RIGID SINGLE TUBING SEGMENT |
| Waveguide Inside Width | 0.688 INCHES MINIMUM AND 0.694 INCHES MAXIMUM IN |
| Cross-Sectional Shape Style | INTERNAL, RECTANGULAR DOUBLE RIDGED EXTERNAL, RECTANGULAR |
| Flange Outside Height | 1.360 INCHES MINIMUM AND 1.390 INCHES MAXIMUM ALL FLANGES IN |
| Flange Connecting Hole Diameter | 0.0937 INCHES MINIMUM AND 0.0939 INCHES MAXIMUM ALL FLANGES THIRD CONNECTION FACILITY IN |
| Flange Connecting Hole Diameter | 0.0960 INCHES MINIMUM AND 0.0965 INCHES MAXIMUM ALL FLANGES SECOND CONNECTION FACILITY IN |
| Flange Connecting Hole Diameter | 0.145 INCHES MINIMUM AND 0.148 INCHES MAXIMUM ALL FLANGES FIRST CONNECTION FACILITY IN |
| Flange Inside Width | 0.688 INCHES MINIMUM AND 0.694 INCHES MAXIMUM ALL FLANGES IN |
| Waveguide Length | 3.750 INCHES NOMINAL IN |
| Waveguide Outside Height | 0.418 INCHES MINIMUM AND 0.424 INCHES MAXIMUM IN |
| Waveguide Outside Width | 0.788 INCHES MINIMUM AND 0.794 INCHES MAXIMUM IN |
| Flange Depth | 0.235 INCHES MINIMUM AND 0.265 INCHES MAXIMUM ALL FLANGES IN |
| Flange Outside Width | 1.360 INCHES MINIMUM AND 1.390 INCHES MAXIMUM ALL FLANGES IN |
| Insertion Loss in Decibels | 0.20 |
| Waveguide Inside Height | 0.318 INCHES MINIMUM AND 0.324 INCHES MAXIMUM IN |
| Material | ALUMINUM ALLOY SINGLE TUBING SEGMENT AND FLANGE |
| Flange Connecting Facility and Quantity | 2 UNTHREADED HOLE(S) ALL FLANGES SECOND CONNECTION FACILITY |
| Flange Connecting Facility and Quantity | 4 UNTHREADED HOLE(S) ALL FLANGES FIRST CONNECTION FACILITY |
| Flange Connecting Facility and Quantity | 2 UNTHREADED HOLE(S) ALL FLANGES THIRD CONNECTION FACILITY |
| Flange Style | CONTACT, DOUBLE RIDGE TYPE ALL FLANGES |
| 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 |
|---|---|
| R170-3.75 | Microwave Engineering Corporation (USA) |
| Reference | Meaning |
|---|---|
| 170-3.75 | 5/9 Secondary reference Microwave Engineering Corporation |
| 3452597-1 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5985-01-342-4020 is a Waveguide Assembly, manufactured by Microwave Engineering Corporation, classified under FSC 5985, Antennas, Waveguides, and Related Equipment. Status: active.
NSN 5985-01-342-4020 has 1 manufacturer part number on file: R170-3.75 (Microwave Engineering Corporation).
Key specifications for R170-3.75: FSC Application Data: ANTENNAS,WAVEGUIDE AND RELATED EQUIPMENT; Tubing Wall Construction Style: SEAMLESS SINGLE TUBING SEGMENT; Flange Inside Height: 0.318 INCHES MINIMUM AND 0.324 INCHES MAXIMUM ALL FLANGES IN; Flange Quantity: 2. 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 5985-01-342-4020 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.