The Seat,valve, cataloged under National Stock Number 4810-00-347-1383, is classified within Federal Supply Class 4810 (Valves, Powered) of the Valves group. The manufacturer of record is Ontic Engineering & Manufacturing, Inc Dba Ontic Us. 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 4810-00-347-1383 |
| Primary Part Number | 525-33 |
| Item Name | Seat,valve |
| FSC / FSG | 4810 / 48 — Valves, Powered |
| Manufacturer | Ontic Engineering & Manufacturing, Inc Dba Ontic Us |
| Status | ACTIVE |
| FSC Application Data | PUMP UNIT,ROTARY |
| Body Outside Diameter | 0.371 INCHES MINIMUM AND 0.373 INCHES MAXIMUM IN |
| Seal Accommodation Type | GROOVED |
| Hardness Rating | 45.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM OVERALL |
| Style Designator | PLAIN |
| Material Document and Classification | MIL-S-7420 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Body Inside Diameter | 0.156 INCHES MINIMUM AND 0.157 INCHES MAXIMUM IN |
| Material | STEEL 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 |
|---|---|
| 525-33 PRIMARY | Ontic Engineering & Manufacturing, Inc Dba Ontic Us (USA) |
| Reference | Meaning |
|---|---|
| 10105878-16 | 5/9 Secondary reference Us Army Aviation and Missile Command |
| 10105876-16 | 5/9 Secondary reference Us Army Aviation and Missile Command |
| 525-33 | 5/9 Secondary reference Donallco Inc |
NSN 4810-00-347-1383 is a Seat,valve, manufactured by Ontic Engineering & Manufacturing, Inc Dba Ontic Us, classified under FSC 4810, Valves, Powered. Status: active.
NSN 4810-00-347-1383 has 1 manufacturer part number on file: 525-33 (Ontic Engineering & Manufacturing, Inc Dba Ontic Us).
2 possible matches (shared part number, not a government interchangeability claim): 4330-00-460-2549, 5110-01-513-1162. Verify interchangeability with system specifications before substitution.
Key specifications for 525-33: Overall Height: 0.255 INCHES NOMINAL IN; FSC Application Data: PUMP UNIT,ROTARY; Body Outside Diameter: 0.371 INCHES MINIMUM AND 0.373 INCHES MAXIMUM IN; Seal Accommodation Type: GROOVED. 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.