The Seal Assembly,shaft,spring Loade, cataloged under National Stock Number 4320-01-494-4252, is classified within Federal Supply Class 4320 (Power and Hand Pumps) of the Pumps and Compressors group. The manufacturer of record is A W Chesterton Co Div Sealing Device Division. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Item Name | Seal Assembly,shaft,spring Loade |
| FSC / FSG | 4320 — Power and Hand Pumps (FSG 43) |
| Manufacturers | Dynamic Applications, Inc. (CAGE 1S6F8); A W Chesterton Co Div Sealing Device Division (CAGE 71431) |
| Parameter | Value |
|---|---|
| NSN | 4320-01-494-4252 |
| Primary Part Number | 643386 |
| Item Name | Seal Assembly,shaft,spring Loade |
| FSC / FSG | 4320 / 43 — Power and Hand Pumps |
| Manufacturer | A W Chesterton Co Div Sealing Device Division |
| Status | ACTIVE |
| 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 |
|---|---|
| 643386 | Dynamic Applications, Inc. (USA) |
| 643386 PRIMARY | A W Chesterton Co Div Sealing Device Division (USA) |
| Reference | Meaning |
|---|---|
| 1801490 | D/9 Drawing number reference only Blackmer System One, Inc. Div Blackmer System One, Inc. |
| 1801490 ITEM NO.80 | 5/9 Secondary reference Blackmer System One, Inc. Div Blackmer System One, Inc. |
| 643386 | C/1 Advisory reference — outside the item-of-supply concept Blackmer System One, Inc. Div Blackmer System One, Inc. |
NSN 4320-01-494-4252 is a Seal Assembly,shaft,spring Loade, manufactured by A W Chesterton Co Div Sealing Device Division, classified under FSC 4320, Power and Hand Pumps. Status: active.
NSN 4320-01-494-4252 has 2 manufacturer part numbers on file: 643386 (Dynamic Applications, Inc.), 643386 (A W Chesterton Co Div Sealing Device Division).
2 possible matches (shared part number, not a government interchangeability claim): 3130-01-495-0906, 3110-01-495-0922. Verify interchangeability with system specifications before substitution.
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.