The Filter,fluid, cataloged under National Stock Number 4330-01-200-5644, 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 Elsag Bailey Inc. Government technical data includes 20 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4330-01-200-5644 |
| Primary Part Number | H4321536-A1 |
| Item Name | Filter,fluid |
| FSC / FSG | 4330 / 43 — Centrifugals, Separators, and Pressure and Vacuum Filters |
| Manufacturer | Elsag Bailey Inc |
| Status | ACTIVE |
| First Discharge Connection Type | THREADED INTERNAL PIPE UPPER SIDE |
| Mounting Hole Quantity | 4 |
| Distance Between Mounting Hole Centers | 4.000 INCHES NOMINAL IN |
| Design Type | REUSABLE |
| Body Outside Diameter | 8.375 INCHES NOMINAL IN |
| Body Height | 42.750 INCHES NOMINAL IN |
| First Intake Connection Type | SOCKET WELDING BOTTOM |
| Style Designator | BODY AND COVER ASSY (BOLTED FLANGE) |
| Mounting Hole Diameter | 0.562 INCHES NOMINAL IN |
| First Discharge Nominal Thread Size | 0.750 INCHES IN |
| Filtering Element Quantity | 3 |
| Filtering System for Which Designed | FULL FLOW |
| First Intake Nominal Inside Diameter | 1.062 INCHES IN |
| First Discharge Thread Direction | RIGHT-HAND |
| First Discharge Connection Relationship to Intake Connection | NOT IDENTICAL |
| Media for Which Designed | AIR |
| Bracket Quantity | 2 |
| Material | STEEL BODY |
| Mounting Type | BRACKET W/DRILLED HOLE SIDE |
| First Discharge Thread Series Designator | NPT |
| 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 |
|---|---|
| H4321536-A1 PRIMARY | Elsag Bailey Inc (USA) |
| Reference | Meaning |
|---|---|
| 5328563A1 | 5/9 Secondary reference Elsag Bailey Inc |
| H5321436-A1 PIECE 20 | 5/9 Secondary reference Elsag Bailey Inc |
| H5321436-A1 PIECE 20 | 5/9 Secondary reference Industrial Service and Supply, Inc |
| 5316617A1 | 5/9 Secondary reference Elsag Bailey Inc |
| H5321436-A1 | 5/9 Secondary reference Elsag Bailey Inc |
| H5321436-A1 | D/9 Drawing number reference only Industrial Service and Supply, Inc |
| 5328563A1 | 5/9 Secondary reference Industrial Service and Supply, Inc |
NSN 4330-01-200-5644 is a Filter,fluid, manufactured by Elsag Bailey Inc, classified under FSC 4330, Centrifugals, Separators, and Pressure and Vacuum Filters. Status: active.
NSN 4330-01-200-5644 has 1 manufacturer part number on file: H4321536-A1 (Elsag Bailey Inc).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-200-8561. Verify interchangeability with system specifications before substitution.
Key specifications for H4321536-A1: First Discharge Connection Type: THREADED INTERNAL PIPE UPPER SIDE; Mounting Hole Quantity: 4; Distance Between Mounting Hole Centers: 4.000 INCHES NOMINAL IN; Design Type: REUSABLE. 20 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.