The Seat,valve, cataloged under National Stock Number 4820-01-181-8656, 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 2 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-181-8656 |
| Primary Part Number | 29969 PIECE 4 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Crane Co Div Valve Div |
| Status | ACTIVE |
| Material Document and Classification | ASTM A351 GR.CF-8M ASSN STD SINGLE MATERIAL RESPONSE SEAT |
| Material | STEEL CORROSION RESISTING SEAT |
| 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 |
|---|---|
| 29969 PIECE 4 | Crane Co Div Valve Div (USA) |
| Reference | Meaning |
|---|---|
| 845-1889551 | D/9 Drawing number reference only U.S. Government activity |
| 2620-920X2 PIECE 4-2IN | 3/2 Design control — primary reference U.S. Government activity |
| 845-1889551 PIECE 4 | 5/2 Secondary reference U.S. Government activity |
| 2620-920X2 | D/9 Drawing number reference only U.S. Government activity |
| 29969 | D/9 Drawing number reference only Crane Co Div Valve Div |
NSN 4820-01-181-8656 is a Seat,valve, manufactured by Crane Co Div Valve Div, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-181-8656 has 1 manufacturer part number on file: 29969 PIECE 4 (Crane Co Div Valve Div).
4 possible matches (shared part number, not a government interchangeability claim): 4820-01-181-8678, 5895-01-365-5067, 4820-01-424-9808. Verify interchangeability with system specifications before substitution.
Key specifications for 29969 PIECE 4: Material Document and Classification: ASTM A351 GR.CF-8M ASSN STD SINGLE MATERIAL RESPONSE SEAT; Material: STEEL CORROSION RESISTING 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.