The Plug,seat Ring, cataloged under National Stock Number 4820-01-173-4196, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Derbyshire Machine & Tool Co. Government technical data includes 1 specification, 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-173-4196 |
| Primary Part Number | 2641-809-42 |
| Item Name | Plug,seat Ring |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Derbyshire Machine & Tool Co |
| Status | ACTIVE |
| General Characteristics Item Description | CYLINDERICAL IN SHAPE;CRES |
| 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 |
|---|---|
| 2641-809-42 PRIMARY | Derbyshire Machine & Tool Co (USA) |
| Reference | Meaning |
|---|---|
| 845-4558743 | D/9 Drawing number reference only U.S. Government activity |
| 2641-809-42 ITEM 88 | 3/2 Design control — primary reference U.S. Government activity |
| 845-4558743 ITEM 19 | 5/2 Secondary reference U.S. Government activity |
| 2641-809-42 | D/9 Drawing number reference only U.S. Government activity |
NSN 4820-01-173-4196 is a Plug,seat Ring, manufactured by Derbyshire Machine & Tool Co, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-173-4196 has 1 manufacturer part number on file: 2641-809-42 (Derbyshire Machine & Tool Co).
Key specifications for 2641-809-42: General Characteristics Item Description: CYLINDERICAL IN SHAPE;CRES; End Item Identification: HI-PRESSURE HYDRAULIC VALVE. 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.