The Seat,valve, cataloged under National Stock Number 4820-00-953-0264, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Acme Products & Engineering Inc. Government technical data includes 9 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through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-953-0264 |
| Primary Part Number | 1418N-AP |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Acme Products & Engineering Inc |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.375 INCHES NOMINAL IN |
| Flange Diameter | 1.359 INCHES NOMINAL IN |
| Body Outside Diameter | 1.109 INCHES NOMINAL IN |
| Hardness Rating | 55.0 BRINELL STANDARD NOMINAL OVERALL |
| Style Designator | PLAIN FLANGED |
| Body Inside Diameter | 0.984 INCHES NOMINAL IN |
| Under Flange Height | 0.250 INCHES NOMINAL IN |
| Material | STEEL CORROSION RESISTING OVERALL |
| Seating Surface Shape | FLAT |
| 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 |
|---|---|
| 1418N-AP | Acme Products & Engineering Inc (USA) |
| Reference | Meaning |
|---|---|
| HL19625PC79 | 5/9 Secondary reference U.S. Government activity |
| SET144 | 5/9 Secondary reference U.S. Government activity |
| 1418N | 5/9 Secondary reference U.S. Government activity |
| 1418N | C/1 Advisory reference — outside the item-of-supply concept Curtiss-Wright Electro-Mechanical Corp Dba Steam & Air Solutions Div Curtiss-Wright Steam and Air Solutions |
| MAI9530264 | 5/9 Secondary reference Argus Mfg Corp |
| 1418N | 3/9 Design control — primary reference Siemens Energy, Inc. Dba Dresser-Rand |
NSN 4820-00-953-0264 is a Seat,valve, manufactured by Acme Products & Engineering Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-953-0264 has 1 manufacturer part number on file: 1418N-AP (Acme Products & Engineering Inc).
Key specifications for 1418N-AP: Flange Seat to Disk End Height: 0.375 INCHES NOMINAL IN; Flange Diameter: 1.359 INCHES NOMINAL IN; Body Outside Diameter: 1.109 INCHES NOMINAL IN; Hardness Rating: 55.0 BRINELL STANDARD NOMINAL OVERALL. 9 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.