The Seat,valve, cataloged under National Stock Number 4820-01-231-0749, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Eaton Aerospace Llc Dba Sterer Engineering Div M.c.aerospace. Government technical data includes 11 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-231-0749 |
| Primary Part Number | MC17327 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Eaton Aerospace Llc Dba Sterer Engineering Div M.c.aerospace |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.205 INCHES NOMINAL IN |
| Flange Diameter | 0.5475 INCHES NOMINAL IN |
| FSC Application Data | AIRCRAFT HYDRAULIC,VACUUM,DEICING SYSTEMS |
| Body Outside Diameter | 0.482 INCHES NOMINAL IN |
| Hardness Rating | 89.3 ROCKWELL SUPERFICIAL 15-N MINIMUM OVERALL |
| Style Designator | PLAIN FLANGED |
| Body Inside Diameter | 0.142 INCHES NOMINAL IN |
| Under Flange Height | 0.290 INCHES NOMINAL IN |
| Material | STEEL COMP 440C OVERALL |
| Seat Angle in Deg | 50.000 NOMINAL |
| Seating Surface Shape | ANGULAR |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| MC17327 PRIMARY | Eaton Aerospace Llc Dba Sterer Engineering Div M.c.aerospace (USA) |
NSN 4820-01-231-0749 is a Seat,valve, manufactured by Eaton Aerospace Llc Dba Sterer Engineering Div M.c.aerospace, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-231-0749 has 1 manufacturer part number on file: MC17327 (Eaton Aerospace Llc Dba Sterer Engineering Div M.c.aerospace).
Key specifications for MC17327: Flange Seat to Disk End Height: 0.205 INCHES NOMINAL IN; Flange Diameter: 0.5475 INCHES NOMINAL IN; FSC Application Data: AIRCRAFT HYDRAULIC,VACUUM,DEICING SYSTEMS; Body Outside Diameter: 0.482 INCHES NOMINAL IN. 11 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.
NSN 4820-01-231-0749 has DEMIL Code Q. Demilitarization may be required before disposal or transfer to non-military entities.
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.