The Flange,waveguide, cataloged under National Stock Number 5985-01-178-0273, 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 Northrop Grumman Support Services Corp. Government technical data includes 13 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5985-01-178-0273 |
| Primary Part Number | 134C974H01 |
| Item Name | Flange,waveguide |
| FSC / FSG | 5985 / 59 — Antennas, Waveguides, and Related Equipment |
| Manufacturer | Northrop Grumman Support Services Corp |
| Status | ACTIVE |
| Flange Inside Height | 4.240 INCHES NOMINAL SINGLE FLANGE IN |
| Flange Connecting Hole Diameter | 0.136 INCHES NOMINAL SINGLE FLANGE SECOND CONNECTION FACILITY IN |
| Flange Inside Width | 4.240 INCHES NOMINAL SINGLE FLANGE IN |
| Thread Direction | RIGHT-HAND SINGLE FLANGE FIRST CONNECTION FACILITY |
| Nominal Thread Size | 0.201 INCHES SINGLE FLANGE FIRST CONNECTION FACILITY IN |
| Flange Depth | 0.500 INCHES NOMINAL SINGLE FLANGE IN |
| Thread Class | 2B SINGLE FLANGE FIRST CONNECTION FACILITY |
| Material | STEEL SINGLE FLANGE |
| Flange Connecting Facility and Quantity | 6 UNTHREADED HOLE(S) SINGLE FLANGE SECOND CONNECTION FACILITY |
| Flange Connecting Facility and Quantity | 8 THREADED HOLE(S) SINGLE FLANGE FIRST CONNECTION FACILITY |
| Flange Outside Diameter | 5.820 INCHES NOMINAL SINGLE FLANGE IN |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) SINGLE FLANGE FIRST CONNECTION FACILITY |
| Flange Style | COVER TYPE SINGLE FLANGE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 134C974H01 PRIMARY | Northrop Grumman Support Services Corp (USA) |
| 134C974H01 | Centroid, Inc. Dba Centroid Inc (USA) |
| 225978 | Microtech Inc Dba Microtech Inc (USA) |
| Reference | Meaning |
|---|---|
| 134C974H01 | 5/9 Secondary reference 3m Company Div Health Care Business |
| 134C974H01 | 3/9 Design control — primary reference U.S. Government activity |
NSN 5985-01-178-0273 is a Flange,waveguide, manufactured by Northrop Grumman Support Services Corp, classified under FSC 5985, Antennas, Waveguides, and Related Equipment. Status: active.
NSN 5985-01-178-0273 has 3 manufacturer part numbers on file: 134C974H01 (Northrop Grumman Support Services Corp), 134C974H01 (Centroid, Inc. Dba Centroid Inc), 225978 (Microtech Inc Dba Microtech Inc).
Key specifications for 134C974H01: Flange Inside Height: 4.240 INCHES NOMINAL SINGLE FLANGE IN; Flange Connecting Hole Diameter: 0.136 INCHES NOMINAL SINGLE FLANGE SECOND CONNECTION FACILITY IN; Flange Inside Width: 4.240 INCHES NOMINAL SINGLE FLANGE IN; Thread Direction: RIGHT-HAND SINGLE FLANGE FIRST CONNECTION FACILITY. 13 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.
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.