The Seat,valve, cataloged under National Stock Number 4820-01-203-4792, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Crane Co Div Valve Div. Government technical data includes 10 specifications, 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-203-4792 |
| Primary Part Number | 29984 PIECE 4 1 1/4 IN |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Crane Co Div Valve Div |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.319 INCHES MINIMUM AND 0.322 INCHES MAXIMUM IN |
| Flange Diameter | 1.563 INCHES NOMINAL IN |
| Body Outside Diameter | 1.389 INCHES MINIMUM AND 1.391 INCHES MAXIMUM IN |
| Style Designator | PLAIN FLANGED |
| Material Document and Classification | ASTM A351 GR.CF-8M ASSN STD SINGLE MATERIAL RESPONSE SEAT |
| Body Inside Diameter | 1.229 INCHES MINIMUM AND 1.239 INCHES MAXIMUM IN |
| Under Flange Height | 0.433 INCHES MINIMUM AND 0.443 INCHES MAXIMUM IN |
| Material | STEEL CORROSION RESISTING SEAT |
| Seat Angle in Deg | 45.000 NOMINAL |
| Seating Surface Shape | ANGULAR |
| 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 |
|---|---|
| 29984 PIECE 4 1 1/4 IN PRIMARY | Crane Co Div Valve Div (USA) |
| Reference | Meaning |
|---|---|
| 29984 | D/9 Drawing number reference only Crane Co Div Valve Div |
NSN 4820-01-203-4792 is a Seat,valve, manufactured by Crane Co Div Valve Div, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-203-4792 has 1 manufacturer part number on file: 29984 PIECE 4 1 1/4 IN (Crane Co Div Valve Div).
1 possible match (shared part number, not a government interchangeability claim): 4320-01-645-0968. Verify interchangeability with system specifications before substitution.
Key specifications for 29984 PIECE 4 1 1/4 IN: Flange Seat to Disk End Height: 0.319 INCHES MINIMUM AND 0.322 INCHES MAXIMUM IN; Flange Diameter: 1.563 INCHES NOMINAL IN; Body Outside Diameter: 1.389 INCHES MINIMUM AND 1.391 INCHES MAXIMUM IN; Style Designator: PLAIN FLANGED. 10 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.