The Attenuator,fixed, cataloged under National Stock Number 5985-01-398-2979, 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 Thales Uk Limited Dba Thales Uk Ltd Defence Mission Systems. The record lists 4 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Item Name | Attenuator,fixed |
| FSC / FSG | 5985 — Antennas, Waveguides, and Related Equipment (FSG 59) |
| Manufacturers | Thales Uk Limited Dba Thales Uk Ltd Defence Mission Systems (CAGE U4338); Trescal Limited (CAGE K0433); Mbda Uk Ltd (CAGE K0967) |
| Parameter | Value |
|---|---|
| NSN | 5985-01-398-2979 |
| Primary Part Number | B65050-1723 |
| Item Name | Attenuator,fixed |
| FSC / FSG | 5985 / 59 — Antennas, Waveguides, and Related Equipment |
| Manufacturer | Thales Uk Limited Dba Thales Uk Ltd Defence Mission Systems |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Part Number | Manufacturer |
|---|---|
| B65050-1723 | Thales Uk Limited Dba Thales Uk Ltd Defence Mission Systems (GBR) |
| 6534-4 | Trescal Limited (GBR) |
| 56534-904 | Trescal Limited (GBR) |
| B40417 | Mbda Uk Ltd (GBR) |
| Reference | Meaning |
|---|---|
| 5789-20 | 3/2 Design control — primary reference U.S. Government activity |
| 56534-904H | 5/9 Secondary reference Trescal Limited |
NSN 5985-01-398-2979 is a Attenuator,fixed, manufactured by Thales Uk Limited Dba Thales Uk Ltd Defence Mission Systems, classified under FSC 5985, Antennas, Waveguides, and Related Equipment. Status: active.
NSN 5985-01-398-2979 has 4 manufacturer part numbers on file: B65050-1723 (Thales Uk Limited Dba Thales Uk Ltd Defence Mission Systems), 6534-4 (Trescal Limited), 56534-904 (Trescal Limited), B40417 (Mbda Uk Ltd).
3 possible matches (shared part number, not a government interchangeability claim): 2530-01-411-5542, 5940-01-549-7751, 5340-01-678-5066. Verify interchangeability with system specifications before substitution.
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.