The Insert,engine Valve Seat, cataloged under National Stock Number 2815-00-147-0475, is classified within Federal Supply Class 2815 (Diesel Engines and Components) of the Engines, Turbines, and Components group. The manufacturer of record is Fairbanks Morse, Llc. Government technical data includes 14 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through both NSN and commercial part number lookups. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2815-00-147-0475 |
| Primary Part Number | ADD544A |
| Item Name | Insert,engine Valve Seat |
| FSC / FSG | 2815 / 28 — Diesel Engines and Components |
| Manufacturer | Fairbanks Morse, Llc |
| Status | ACTIVE |
| Thread Length | 0.375 INCHES NOMINAL FIRST THREADED PORTION IN |
| Thread Length | 0.490 INCHES NOMINAL SECOND THREADED PORTION IN |
| Body Stepped Inside Diameter | 0.289 INCHES NOMINAL FIRST STEP IN |
| Body Stepped Inside Diameter | 0.405 INCHES NOMINAL SECOND STEP IN |
| Body Stepped Inside Diameter | 0.500 INCHES NOMINAL THIRD STEP IN |
| Style Designator | DOUBLE FLANGED |
| Nominal Thread Size | 0.625 INCHES FIRST THREADED PORTION IN |
| Nominal Thread Size | 0.750 INCHES SECOND THREADED PORTION IN |
| Thread Class | 2A SECOND THREADED PORTION A |
| Thread Class | 2A FIRST THREADED PORTION A |
| Material | STEEL CORROSION RESISTING OVERALL |
| Thread Series Designator | UNF FIRST THREADED PORTION |
| Thread Series Designator | UNF SECOND THREADED PORTION |
| 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 |
|---|---|
| ADD544A PRIMARY | Fairbanks Morse, Llc (USA) |
| Reference | Meaning |
|---|---|
| 13ADD531PC6 | 5/9 Secondary reference U.S. Government activity |
| 7ADD531PC6 | 5/9 Secondary reference U.S. Government activity |
| ADE544A | 5/9 Secondary reference U.S. Government activity |
| ADD544A | 3/9 Design control — primary reference U.S. Government activity |
| 10ADE531PC6 | 5/9 Secondary reference U.S. Government activity |
| MADG531PC6 | 5/9 Secondary reference U.S. Government activity |
| 15ADD531PC6 | 5/9 Secondary reference U.S. Government activity |
NSN 2815-00-147-0475 is a Insert,engine Valve Seat, manufactured by Fairbanks Morse, Llc, classified under FSC 2815, Diesel Engines and Components. Status: active.
NSN 2815-00-147-0475 has 1 manufacturer part number on file: ADD544A (Fairbanks Morse, Llc).
Key specifications for ADD544A: Overall Height: 1.625 INCHES NOMINAL IN; Thread Length: 0.375 INCHES NOMINAL FIRST THREADED PORTION IN; Thread Length: 0.490 INCHES NOMINAL SECOND THREADED PORTION IN; Body Stepped Inside Diameter: 0.289 INCHES NOMINAL FIRST STEP IN. 14 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.