The Waveguide Assembly, cataloged under National Stock Number 5985-01-253-0891, 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 23 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5985-01-253-0891 |
| Primary Part Number | 187WX39 |
| Item Name | Waveguide Assembly |
| 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 |
| Flange Inside Height | 0.867 INCHES MINIMUM AND 0.877 INCHES MAXIMUM SINGLE FLANGE IN |
| Flange Quantity | 2 |
| Voltage Standing Wave Ratio | 1.25 |
| Waveguide Leg Length | 8.000 INCHES NOMINAL IN |
| Style Designator | U-BEND TYPE |
| Flexibility | RIGID SINGLE TUBING SEGMENT |
| Waveguide Inside Width | 7.690 INCHES MINIMUM AND 7.710 INCHES MAXIMUM IN |
| Cross-Sectional Shape Style | INTERNAL, RECTANGULAR EXTERNAL, RECTANGULAR |
| Operating Pressure | 3.0 POUNDS PER SQUARE INCH GAUGE (PSIG) MAXIMUM LBS |
| Flange Outside Height | 2.480 INCHES MINIMUM AND 2.520 INCHES MAXIMUM SINGLE FLANGE IN |
| Waveguide Center to Center Distance | 4.500 INCHES NOMINAL IN |
| Flange Inside Width | 1.867 INCHES MINIMUM AND 1.877 INCHES MAXIMUM SINGLE FLANGE IN |
| Waveguide Outside Height | 4.090 INCHES MINIMUM AND 4.110 INCHES MAXIMUM IN |
| Waveguide Outside Width | 7.940 INCHES MINIMUM AND 9.960 INCHES MAXIMUM IN |
| Flange Depth | 0.670 INCHES MINIMUM AND 0.710 INCHES MAXIMUM SINGLE FLANGE IN |
| Flange Outside Width | 3.480 INCHES MINIMUM AND 3.520 INCHES MAXIMUM SINGLE FLANGE IN |
| Insertion Loss in Decibels | 0.80 |
| Waveguide Inside Height | 3.840 INCHES MINIMUM AND 3.860 INCHES MAXIMUM IN |
| Waveguide Longer Leg Length | 10.500 INCHES NOMINAL IN |
| Material | ALUMINUM ALLOY 6061 SINGLE TUBING SEGMENT |
| Flange Connecting Facility and Quantity | 10 UNTHREADED HOLE(S) ALL FLANGES ALL CONNECTION FACILITIES |
| Flange Style | CONTACT 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 |
|---|---|
| 187WX39 PRIMARY | Microwave Development Laboratories, Inc. Dba Microwave Development Laboratories Inc (USA) |
| 433738-1 PRIMARY | Frontgrade Technologies Inc. (USA) |
| Reference | Meaning |
|---|---|
| 433738-1 | 5/9 Secondary reference U.S. Government activity |
| 8006-8130-1 | 7/9 Vendor item drawing reference Drs Icas, Llc |
NSN 5985-01-253-0891 is a Waveguide Assembly, manufactured by Microwave Development Laboratories, Inc. Dba Microwave Development Laboratories Inc, classified under FSC 5985, Antennas, Waveguides, and Related Equipment. Status: active.
NSN 5985-01-253-0891 has 2 manufacturer part numbers on file: 187WX39 (Microwave Development Laboratories, Inc. Dba Microwave Development Laboratories Inc), 433738-1 (Frontgrade Technologies Inc.).
Key specifications for 187WX39: Tubing Wall Construction Style: SEAMLESS SINGLE TUBING SEGMENT; Flange Inside Height: 0.867 INCHES MINIMUM AND 0.877 INCHES MAXIMUM SINGLE FLANGE IN; Flange Quantity: 2; Voltage Standing Wave Ratio: 1.25. 23 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 5985-01-253-0891 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.