The Adapter,waveguide, cataloged under National Stock Number 5985-01-140-8122, 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 Keysight Technologies Inc. Government technical data includes 22 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5985-01-140-8122 |
| Primary Part Number | K281C |
| Item Name | Adapter,waveguide |
| FSC / FSG | 5985 / 59 — Antennas, Waveguides, and Related Equipment |
| Manufacturer | Keysight Technologies Inc |
| Status | ACTIVE |
| Tubing Wall Construction Style | SEAMLESS SINGLE TUBING SEGMENT |
| Flange Inside Height | 0.250 INCHES NOMINAL SINGLE FLANGE IN |
| Flange Quantity | 1 |
| Voltage Standing Wave Ratio | 1.07 |
| Adapter Overall Width | 0.875 INCHES NOMINAL IN |
| Style Designator | WAVEGUIDE TO COAXIAL |
| Waveguide Inside Width | 0.420 INCHES NOMINAL IN |
| Connector End Design | FEMALE |
| Cross-Sectional Shape Style | INTERNAL, RECTANGULAR EXTERNAL, RECTANGULAR |
| Flange Outside Height | 0.875 INCHES NOMINAL SINGLE FLANGE IN |
| Flange Connecting Hole Diameter | 0.116 INCHES NOMINAL ALL FLANGES ALL CONNECTION FACILITIES IN |
| Flange Inside Width | 0.500 INCHES NOMINAL SINGLE FLANGE IN |
| Waveguide Outside Height | 0.250 INCHES NOMINAL IN |
| Waveguide Outside Width | 0.500 INCHES NOMINAL IN |
| Flange Depth | 0.188 INCHES NOMINAL SINGLE FLANGE IN |
| Flange Outside Width | 0.875 INCHES NOMINAL SINGLE FLANGE IN |
| Waveguide Inside Height | 0.170 INCHES NOMINAL IN |
| Adapter Height | 0.875 INCHES NOMINAL IN |
| Material | ALUMINUM ALLOY SINGLE FLANGE |
| Flange Connecting Facility and Quantity | 4 UNTHREADED HOLE(S) ALL FLANGES ALL CONNECTION FACILITIES |
| Flange Style | COVER TYPE SINGLE FLANGE |
| Coaxial Connector Series Designation | APC-3.5 |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| K281C | Keysight Technologies Inc (USA) |
| K281C | F.e.r.t. Forniture Elettroniche Radio Trasmissioni Di Paladini Enrico E C. - SAS (ITA) |
| K-175-APC | 3dbm Co Inc Waveguide Group (USA) |
| Reference | Meaning |
|---|---|
| K281C | 3/9 Design control — primary reference Keysight Technologies, Inc. |
| JRXX-00200 | C/1 Advisory reference — outside the item-of-supply concept Giga-Tronics Incorporated Dba Giga-Tronics |
| 1716AS-00 | 5/9 Secondary reference Wavetronics Inc |
| K281C | 5/9 Secondary reference Hewlett-Packard Company Dba HP |
NSN 5985-01-140-8122 is a Adapter,waveguide, manufactured by Keysight Technologies Inc, classified under FSC 5985, Antennas, Waveguides, and Related Equipment. Status: active.
NSN 5985-01-140-8122 has 3 manufacturer part numbers on file: K281C (Keysight Technologies Inc), K281C (F.e.r.t. Forniture Elettroniche Radio Trasmissioni Di Paladini Enrico E C. - SAS), K-175-APC (3dbm Co Inc Waveguide Group).
Key specifications for K281C: Tubing Wall Construction Style: SEAMLESS SINGLE TUBING SEGMENT; Flange Inside Height: 0.250 INCHES NOMINAL SINGLE FLANGE IN; Flange Quantity: 1; Voltage Standing Wave Ratio: 1.07. 22 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 5985-01-140-8122 has DEMIL Code Q. 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.