The Seat,valve, cataloged under National Stock Number 4820-00-511-5174, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Mid-America Aerotech, Llc. Government technical data includes 8 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 5 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-00-511-5174 |
| Primary Part Number | 13789 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Mid-America Aerotech, Llc |
| Status | ACTIVE |
| Flange Diameter | 0.496 INCHES MINIMUM AND 0.498 INCHES MAXIMUM IN |
| FSC Application Data | AIRCRAFT HYDRAULIC DIRECTIONAL FLOW CONTROL VALVE |
| Body Outside Diameter | 0.387 INCHES MINIMUM AND 0.389 INCHES MAXIMUM IN |
| Seal Accommodation Type | GROOVED |
| Hardness Rating | 25.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM BODY |
| Body Inside Diameter | 0.055 INCHES MINIMUM AND 0.192 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Material | STEEL OVERALL |
| 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 |
|---|---|
| 13789 | Mid-America Aerotech, Llc (USA) |
| Reference | Meaning |
|---|---|
| 13789 | 5/9 Secondary reference E-Systems Inc Montek Div Fluid Controls Opns |
| 13789 | 5/9 Secondary reference Moog Inc Div Moog Inc., Space and Defense - Salt Lake City |
| 13789 | 3/9 Design control — primary reference U.S. Government activity |
NSN 4820-00-511-5174 is a Seat,valve, manufactured by Mid-America Aerotech, Llc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-511-5174 has 1 manufacturer part number on file: 13789 (Mid-America Aerotech, Llc).
5 possible matches (shared part number, not a government interchangeability claim): 2925-00-571-1062, 5330-00-965-6430, 3040-01-131-5747. Verify interchangeability with system specifications before substitution.
Key specifications for 13789: Flange Diameter: 0.496 INCHES MINIMUM AND 0.498 INCHES MAXIMUM IN; Overall Height: 0.234 INCHES MINIMUM AND 0.236 INCHES MAXIMUM IN; FSC Application Data: AIRCRAFT HYDRAULIC DIRECTIONAL FLOW CONTROL VALVE; Body Outside Diameter: 0.387 INCHES MINIMUM AND 0.389 INCHES MAXIMUM IN. 8 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.