The Seat,valve, cataloged under National Stock Number 4820-00-700-7238, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Northrop Grumman Systems Corporation. Government technical data includes 10 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-700-7238 |
| Primary Part Number | 89HM10974-1 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Northrop Grumman Systems Corporation |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.078 INCHES NOMINAL IN |
| Flange Diameter | 0.684 INCHES MINIMUM AND 0.685 INCHES MAXIMUM IN |
| FSC Application Data | CYLINDER ASSEMBLY,HYDRAULIC SYSTEM,AIRCRAFT |
| Body Outside Diameter | 0.684 INCHES MINIMUM AND 0.685 INCHES MAXIMUM IN |
| Seal Accommodation Type | GROOVED |
| Style Designator | PLAIN FLANGED |
| Body Inside Diameter | 0.509 INCHES MINIMUM AND 0.511 INCHES MAXIMUM IN |
| Under Flange Height | 0.218 INCHES NOMINAL IN |
| Material | STEEL COMP 440C 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 |
|---|---|
| 89HM10974-1 PRIMARY | Northrop Grumman Systems Corporation (USA) |
| 89HM10974-1 | D F P Manufacturing Corp Dba D F P (USA) |
NSN 4820-00-700-7238 is a Seat,valve, manufactured by Northrop Grumman Systems Corporation, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-700-7238 has 2 manufacturer part numbers on file: 89HM10974-1 (Northrop Grumman Systems Corporation), 89HM10974-1 (D F P Manufacturing Corp Dba D F P).
Key specifications for 89HM10974-1: Flange Seat to Disk End Height: 0.078 INCHES NOMINAL IN; Flange Diameter: 0.684 INCHES MINIMUM AND 0.685 INCHES MAXIMUM IN; FSC Application Data: CYLINDER ASSEMBLY,HYDRAULIC SYSTEM,AIRCRAFT; Body Outside Diameter: 0.684 INCHES MINIMUM AND 0.685 INCHES MAXIMUM IN. 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.