The Piston Assembly, cataloged under National Stock Number 4320-01-234-6982, is classified within Federal Supply Class 4320 (Power and Hand Pumps) of the Pumps and Compressors group. The manufacturer of record is Naval Inventory Control Point Mechanicsburg. Government technical data includes 1 specification, 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4320-01-234-6982 |
| Primary Part Number | W-278 VM |
| Item Name | Piston Assembly |
| FSC / FSG | 4320 / 43 — Power and Hand Pumps |
| Manufacturer | Naval Inventory Control Point Mechanicsburg |
| Status | ACTIVE |
| Reference Number Differentiating Characteristics | NON MAGNETIC PERMEABILITY OF 2.0 PCT OR LESS |
| 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 |
|---|---|
| W-278 VM | Naval Inventory Control Point Mechanicsburg (USA) |
| BM-S-517 ITEM 1 VM | Naval Inventory Control Point Mechanicsburg (USA) |
| Reference | Meaning |
|---|---|
| BM-S-517 ITEM 1 | 3/9 Design control — primary reference Metso Minerals Industries, Inc. Dba Bulk Material Handling |
| W-278 | 5/9 Secondary reference Metso Minerals Industries, Inc. Dba Bulk Material Handling |
NSN 4320-01-234-6982 is a Piston Assembly, manufactured by Naval Inventory Control Point Mechanicsburg, classified under FSC 4320, Power and Hand Pumps. Status: active.
NSN 4320-01-234-6982 has 2 manufacturer part numbers on file: W-278 VM (Naval Inventory Control Point Mechanicsburg), BM-S-517 ITEM 1 VM (Naval Inventory Control Point Mechanicsburg).
Key specifications for W-278 VM: Reference Number Differentiating Characteristics: NON MAGNETIC PERMEABILITY OF 2.0 PCT OR LESS. 1 specification is 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.