The Cover,fluid Filter, cataloged under National Stock Number 4330-01-337-7631, is classified within Federal Supply Class 4330 (Centrifugals, Separators, and Pressure and Vacuum Filters) of the Pumps and Compressors group. Government technical data includes 14 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4330-01-337-7631 |
| Item Name | Cover,fluid Filter |
| FSC / FSG | 4330 / 43 — Centrifugals, Separators, and Pressure and Vacuum Filters |
| Status | ACTIVE |
| Flange Thickness | 0.890 INCHES NOMINAL IN |
| Bolt Circle Hole Quantity | 12 |
| First Recess Inside Height | 0.816 INCHES NOMINAL IN |
| Mounting Hole Type and Quantity | 12 PLAIN |
| Mounting Opening Shape Style | UNTHREADED HOLE |
| Cross-Sectional Shape Style | RECESS, SAME SHAPE AS THE PERIPHERY |
| Outside Diameter | 10.130 INCHES NOMINAL IN |
| Bolt Circle Diameter | 8.875 INCHES NOMINAL IN |
| Fluid Filter Element Retainer | NOT INCLUDED |
| Peripheral Shape Style | CIRCULAR |
| Material | COPPER ALLOY |
| Hole Diameter | 0.687 INCHES NOMINAL IN |
| Attachment Method | BOLTED |
| Body Thickness | 1.174 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 |
| Reference | Meaning |
|---|---|
| 841499 | D/9 Drawing number reference only U.S. Government activity |
| 803-841499-7 AY88 | 3/2 Design control — primary reference U.S. Government activity |
| 841499-7 REV K 6IN | 5/2 Secondary reference U.S. Government activity |
NSN 4330-01-337-7631 is a Cover,fluid Filter, classified under FSC 4330, Centrifugals, Separators, and Pressure and Vacuum Filters. Status: active.
Key specifications for 4330-01-337-7631: Flange Thickness: 0.890 INCHES NOMINAL IN; Bolt Circle Hole Quantity: 12; First Recess Inside Height: 0.816 INCHES NOMINAL IN; Mounting Hole Type and Quantity: 12 PLAIN. 14 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.