The Filter,fluid, cataloged under National Stock Number 4330-01-221-1031, 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 Ingersoll-Rand Company Dba Ingersoll-Rand Div Tool & Hoist Division. Government technical data includes 21 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4330-01-221-1031 |
| Primary Part Number | 25351-020 |
| Item Name | Filter,fluid |
| FSC / FSG | 4330 / 43 — Centrifugals, Separators, and Pressure and Vacuum Filters |
| Manufacturer | Ingersoll-Rand Company Dba Ingersoll-Rand Div Tool & Hoist Division |
| Status | ACTIVE |
| Filtering Media Design | SINTERED SINGLE FILTERING MEDIA RESPONSE |
| Filtration Rating in Microns | 40.0 ABSOLUTE |
| First Intake Nominal Thread Size | 0.750 INCHES IN |
| First Intake Thread Series Designator | NPT |
| Design Type | REUSABLE |
| Body Outside Diameter | 3.000 INCHES NOMINAL IN |
| Temp Rating | 200.0 FAHRENHEIT MAXIMUM DEGF |
| First Intake Thread Direction | RIGHT-HAND |
| Body Height | 9.875 INCHES NOMINAL IN |
| First Intake Connection Type | THREADED INTERNAL PIPE HEAD SIDE |
| Style Designator | QUICK-DISCONNECT SHELL |
| Operating Pressure | 250.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM LOCATION NOT OTHERWISE SPECIFIED LBS |
| Features Provided | DRAIN COCK |
| Filtering Element Quantity | 1 |
| Filtering System for Which Designed | FULL FLOW |
| First Discharge Connection Relationship to Intake Connection | IDENTICAL TO FIRST INTAKE CONNECTION |
| Media for Which Designed | AIR |
| Material | COPPER ALLOY FILTERING MEDIUM |
| Material | ZINC ALLOY BODY |
| Material | METAL SEDIMENT BOWL |
| Mounting Type | INLET CONNECTION OR OUTLET CONNECTION LINE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| D10/1232 | Didsbury Engineering Co.limited (GBR) |
| 25351-020 PRIMARY | Ingersoll-Rand Company Dba Ingersoll-Rand Div Tool & Hoist Division (USA) |
| 25351-000 | Didsbury Engineering Co.limited (GBR) |
| Reference | Meaning |
|---|---|
| 25351-000 | 5/9 Secondary reference Ingersoll-Rand Company Dba Ingersoll-Rand |
NSN 4330-01-221-1031 is a Filter,fluid, manufactured by Ingersoll-Rand Company Dba Ingersoll-Rand Div Tool & Hoist Division, classified under FSC 4330, Centrifugals, Separators, and Pressure and Vacuum Filters. Status: active.
NSN 4330-01-221-1031 has 3 manufacturer part numbers on file: D10/1232 (Didsbury Engineering Co.limited), 25351-020 (Ingersoll-Rand Company Dba Ingersoll-Rand Div Tool & Hoist Division), 25351-000 (Didsbury Engineering Co.limited).
1 possible match (shared part number, not a government interchangeability claim): 4220-01-545-7618. Verify interchangeability with system specifications before substitution.
Key specifications for 25351-020: Filtering Media Design: SINTERED SINGLE FILTERING MEDIA RESPONSE; Filtration Rating in Microns: 40.0 ABSOLUTE; First Intake Nominal Thread Size: 0.750 INCHES IN; First Intake Thread Series Designator: NPT. 21 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.