The Seat,valve, cataloged under National Stock Number 4820-01-226-1603, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 2 specifications, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-226-1603 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Material Document and Classification | ASTMA-108 ASSN STD SINGLE MATERIAL RESPONSE SEAT |
| Material | STEEL COMP 1020 SEAT |
| 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 |
|---|---|
| NK683-1 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| NK683-1 | 3/9 Design control — primary reference U.S. Government activity |
| NK683 PIECE 1 | 5/9 Secondary reference U.S. Government activity |
| NK-683 | D/9 Drawing number reference only U.S. Government activity |
NSN 4820-01-226-1603 is a Seat,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-01-226-1603: Material Document and Classification: ASTMA-108 ASSN STD SINGLE MATERIAL RESPONSE SEAT; Special Features: 3.984 IN. OD, 2.891 IN. ID, 0.500 IN. H, SPLIT IN; Material: STEEL COMP 1020 SEAT. 2 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.