The Waveguide Assembly, cataloged under National Stock Number 5985-01-283-5933, 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 27 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5985-01-283-5933 |
| Primary Part Number | R187-C1-C1 |
| Item Name | Waveguide Assembly |
| FSC / FSG | 5985 / 59 — Antennas, Waveguides, and Related Equipment |
| Manufacturer | Microwave Engineering Corporation |
| Status | ACTIVE |
| Tubing Wall Construction Style | SEAMLESS SINGLE TUBING SEGMENT |
| Flange Inside Height | 0.438 INCHES MINIMUM AND 0.444 INCHES MAXIMUM ALL FLANGES IN |
| Flange Quantity | 2 |
| Voltage Standing Wave Ratio | 1.20 |
| Style Designator | STRAIGHT TYPE |
| Flexibility | RIGID SINGLE TUBING SEGMENT |
| Waveguide Inside Width | 0.717 INCHES MINIMUM AND 0.723 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 | 0.096 INCHES MINIMUM AND 0.097 INCHES MAXIMUM ALL FLANGES SECOND CONNECTION FACILITY IN |
| Flange Connecting Hole Diameter | 0.145 INCHES MINIMUM AND 0.148 INCHES MAXIMUM ALL FLANGES THIRD CONNECTION FACILITY IN |
| Flange Inside Width | 0.808 INCHES MINIMUM AND 0.814 INCHES MAXIMUM ALL FLANGES IN |
| Thread Direction | RIGHT-HAND ALL FLANGES FIRST CONNECTION FACILITY |
| Waveguide Length | 4.250 INCHES NOMINAL IN |
| Nominal Thread Size | 0.138 INCHES ALL FLANGES FIRST CONNECTION FACILITY IN |
| Waveguide Outside Height | 0.600 INCHES MAXIMUM IN |
| Waveguide Outside Width | 0.970 INCHES MAXIMUM IN |
| Flange Depth | 0.245 INCHES NOMINAL ALL FLANGES IN |
| Flange Outside Width | 1.360 INCHES MINIMUM AND 1.390 INCHES MAXIMUM ALL FLANGES IN |
| Waveguide Inside Height | 0.318 INCHES MINIMUM AND 0.324 INCHES MAXIMUM IN |
| Thread Class | 2B ALL FLANGES FIRST CONNECTION FACILITY |
| 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 | 2 THREADED HOLE(S) ALL FLANGES FIRST CONNECTION FACILITY |
| Flange Connecting Facility and Quantity | 2 UNTHREADED HOLE(S) ALL FLANGES THIRD CONNECTION FACILITY |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) ALL FLANGES FIRST 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 |
|---|---|
| R187-C1-C1 | Microwave Engineering Corporation (USA) |
| BFU650 | Frontgrade Technologies Inc. (USA) |
| 29650-106 | Microwave Development Company Inc Dba Microwave Development Company Inc (USA) |
| Reference | Meaning |
|---|---|
| 10109870-101 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5985-01-283-5933 is a Waveguide Assembly, manufactured by Microwave Engineering Corporation, classified under FSC 5985, Antennas, Waveguides, and Related Equipment. Status: active.
NSN 5985-01-283-5933 has 3 manufacturer part numbers on file: R187-C1-C1 (Microwave Engineering Corporation), BFU650 (Frontgrade Technologies Inc.), 29650-106 (Microwave Development Company Inc Dba Microwave Development Company Inc).
Key specifications for R187-C1-C1: Tubing Wall Construction Style: SEAMLESS SINGLE TUBING SEGMENT; Flange Inside Height: 0.438 INCHES MINIMUM AND 0.444 INCHES MAXIMUM ALL FLANGES IN; Flange Quantity: 2; Voltage Standing Wave Ratio: 1.20. 27 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 5985-01-283-5933 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.