The Filter Element,fluid, cataloged under National Stock Number 4330-01-035-5981, is classified within Federal Supply Class 4330 (Centrifugals, Separators, and Pressure and Vacuum Filters) of the Pumps and Compressors group. The manufacturer of record is Farr Co. Government technical data includes 13 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 | 4330-01-035-5981 |
| Primary Part Number | B50121 |
| Item Name | Filter Element,fluid |
| FSC / FSG | 4330 / 43 — Centrifugals, Separators, and Pressure and Vacuum Filters |
| Manufacturer | Farr Co |
| Status | ACTIVE |
| Filtering Media Design | MESH SINGLE FILTERING MEDIA RESPONSE |
| Body Overall Length | 20.470 INCHES NOMINAL IN |
| Flow Direction | OUTSIDE IN |
| Design Type | LIMITED |
| Mesh Size | 14.0 AND 16.0 |
| Style Designator | RECTANGULAR (INCL SQUARE) |
| Face Velocity | 350.0 FEET PER MINUTE FT |
| Surface Treatment | PAINT FRAME |
| Media for Which Designed | AIR |
| Material | ALUMINUM ALLOY FRAME |
| Material | ALUMINUM ALLOY FILTERING MEDIUM |
| Wire Diameter | 0.013 INCHES NOMINAL IN |
| Body Thickness | 1.125 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
NSN 4330-01-035-5981 is a Filter Element,fluid, manufactured by Farr Co, classified under FSC 4330, Centrifugals, Separators, and Pressure and Vacuum Filters. Status: active.
NSN 4330-01-035-5981 has 2 manufacturer part numbers on file: B50121 (Farr Co), 10282534 (Us Army Aviation and Missile Command).
1 possible match (shared part number, not a government interchangeability claim): 4330-01-060-1055. Verify interchangeability with system specifications before substitution.
Key specifications for B50121: Filtering Media Design: MESH SINGLE FILTERING MEDIA RESPONSE; Body Overall Length: 20.470 INCHES NOMINAL IN; Flow Direction: OUTSIDE IN; Design Type: LIMITED. 13 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). 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.