The Flange,waveguide, cataloged under National Stock Number 5985-00-239-0149, 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 Systems Corporation. Government technical data includes 14 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. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5985-00-239-0149 |
| Primary Part Number | 1881213 |
| Item Name | Flange,waveguide |
| FSC / FSG | 5985 / 59 — Antennas, Waveguides, and Related Equipment |
| Manufacturer | Northrop Grumman Systems Corporation |
| Status | ACTIVE |
| Flange Inside Diameter | 1.813 INCHES NOMINAL SINGLE FLANGE IN |
| Flange Connecting Hole Diameter | 0.166 INCHES NOMINAL SINGLE FLANGE SECOND CONNECTION FACILITY IN |
| Thread Direction | RIGHT-HAND SINGLE FLANGE FIRST CONNECTION FACILITY |
| Nominal Thread Size | 0.138 INCHES SINGLE FLANGE FIRST CONNECTION FACILITY IN |
| Flange Depth | 0.719 INCHES NOMINAL SINGLE FLANGE IN |
| Surface Treatment | ANODIZE SINGLE FLANGE ALL SURFACES |
| Thread Class | 2B SINGLE FLANGE FIRST CONNECTION FACILITY |
| Thread Quantity Per Inch | 32 SINGLE FLANGE FIRST CONNECTION FACILITY |
| Material | ALUMINUM ALLOY 6061 SINGLE FLANGE |
| Flange Connecting Facility and Quantity | 4 THREADED HOLE(S) SINGLE FLANGE FIRST CONNECTION FACILITY |
| Flange Connecting Facility and Quantity | 6 UNTHREADED HOLE(S) SINGLE FLANGE SECOND CONNECTION FACILITY |
| Flange Outside Diameter | 4.125 INCHES NOMINAL SINGLE FLANGE IN |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) SINGLE FLANGE FIRST CONNECTION FACILITY |
| Flange Style | CHOKE 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 |
NSN 5985-00-239-0149 is a Flange,waveguide, manufactured by Northrop Grumman Systems Corporation, classified under FSC 5985, Antennas, Waveguides, and Related Equipment. Status: active.
NSN 5985-00-239-0149 has 2 manufacturer part numbers on file: 1881213 (Main Machine Co., Inc. Div Main Machine & Tool Co.), 1881213 (Northrop Grumman Systems Corporation).
1 possible match (shared part number, not a government interchangeability claim): 5310-01-181-5046. Verify interchangeability with system specifications before substitution.
Key specifications for 1881213: Flange Inside Diameter: 1.813 INCHES NOMINAL SINGLE FLANGE IN; Flange Connecting Hole Diameter: 0.166 INCHES NOMINAL SINGLE FLANGE SECOND CONNECTION FACILITY IN; Thread Direction: RIGHT-HAND SINGLE FLANGE FIRST CONNECTION FACILITY; Nominal Thread Size: 0.138 INCHES SINGLE FLANGE FIRST CONNECTION FACILITY IN. 14 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.