The Attenuator,variable, cataloged under National Stock Number 5985-01-180-4099, 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 Telonic Berkeley, Inc. Dba Telonic Berkeley. Government technical data includes 25 specifications, cited from the U.S. Government catalog. The record lists 4 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5985-01-180-4099 |
| Primary Part Number | 8122S-129 |
| Item Name | Attenuator,variable |
| FSC / FSG | 5985 / 59 — Antennas, Waveguides, and Related Equipment |
| Manufacturer | Telonic Berkeley, Inc. Dba Telonic Berkeley |
| Status | ACTIVE |
| Shaft Type | ROUND, SLOTTED |
| Insertion Loss at Minimum Attenuation in Maximum Decibels | 0.2 |
| Impedance Rating in Ohms | 50.0 INPUT-OUTPUT |
| Mounting Facility Type and Quantity | 4 THREADED HOLE(S) |
| Frequency Range | 0.000 HERTZ MINIMUM AND 1.000 GIGAHERTZ MAXIMUM |
| Shaft Diameter | 0.250 INCHES NOMINAL IN |
| Body Style | COAXIAL TYPE |
| Mounting Facility Pattern | FOUR POSITION DIAMOND |
| Adjustment Device Type and Quantity | 1 SHAFT |
| Overall Attenuation Range in Decibels | +0.0 TO 10.0 |
| Voltage Standing Wave Ratio | 1.30 |
| Mounting Facility Screw Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Overall Attenuation Accuracy in Decibels | -0.20 TO 0.20 |
| Attenuation Per Step in Decibels | 1.0 |
| Attenuation Variation Method | STEPPED |
| Center to Center Distance Between Mounting Facilities Parallel to Height | 0.750 INCHES NOMINAL IN |
| Mounting Thread Quantity | 32 PER INCH |
| Shaft Length | 0.260 INCHES NOMINAL IN |
| Mounting Facility Nominal Screw Thread Diameter | 0.138 INCHES IN |
| Center to Center Distance Between Mounting Facilities Parallel to Width | 0.750 INCHES NOMINAL IN |
| Application Design | TRANSMISSION LINE |
| Terminal Type and Quantity | 2 CONNECTOR, COAXIAL, FEMALE |
| Power Rating | 2.0 WATTS AVERAGE |
| Step Position Quantity | 10 |
| Coaxial Connector Series Designation | BNC AND SMA |
| 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 |
|---|---|
| 18-P02541M001 | Wavetek Rf Products, Inc (USA) |
| 50R-059 | Jfw Industries Incorporated Dba Jfw Industries Inc (USA) |
| 8122S-129 PRIMARY | Telonic Berkeley, Inc. Dba Telonic Berkeley (USA) |
| 50V10-1088 | Alan Industries Inc (USA) |
| Reference | Meaning |
|---|---|
| 18-P02541M001 | 7/2 Vendor item drawing reference General Dynamics Mission Systems, Inc. Dba Gdms |
| 18-P02541M001 | 5/9 Secondary reference U.S. Government activity |
| 81225-129 | 5/9 Secondary reference Telonic Berkeley, Inc. Dba Telonic Berkeley |
| 18-P02541M001 | 5/9 Secondary reference Trilithic, Inc. |
| 18-P02541M001 | 5/9 Secondary reference Jfw Industries Incorporated Dba Jfw Industries Inc |
| 18-P02541M001 | 5/9 Secondary reference Alan Industries Inc |
NSN 5985-01-180-4099 is a Attenuator,variable, manufactured by Telonic Berkeley, Inc. Dba Telonic Berkeley, classified under FSC 5985, Antennas, Waveguides, and Related Equipment. Status: active.
NSN 5985-01-180-4099 has 4 manufacturer part numbers on file: 18-P02541M001 (Wavetek Rf Products, Inc), 50R-059 (Jfw Industries Incorporated Dba Jfw Industries Inc), 8122S-129 (Telonic Berkeley, Inc. Dba Telonic Berkeley), 50V10-1088 (Alan Industries Inc).
Key specifications for 8122S-129: Shaft Type: ROUND, SLOTTED; Insertion Loss at Minimum Attenuation in Maximum Decibels: 0.2; Impedance Rating in Ohms: 50.0 INPUT-OUTPUT; Mounting Facility Type and Quantity: 4 THREADED HOLE(S). 25 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 5985-01-180-4099 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.