The Valve,poppet,engine, cataloged under National Stock Number 2815-00-288-3639, is classified within Federal Supply Class 2815 (Diesel Engines and Components) of the Engines, Turbines, and Components group. The manufacturer of record is Hatch & Kirk, Inc.. Government technical data includes 17 specifications, cited from the U.S. Government catalog. The record lists 8 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 42 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government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 | 2815-00-288-3639 |
| Primary Part Number | R61 |
| Item Name | Valve,poppet,engine |
| FSC / FSG | 2815 / 28 — Diesel Engines and Components |
| Manufacturer | Hatch & Kirk, Inc. |
| Status | ACTIVE |
| Stem Diameter | 0.3720 INCHES MINIMUM AND 0.3730 INCHES MAXIMUM IN |
| FSC Application Data | DIESEL ENGINE |
| Head Height | 0.1719 INCHES NOMINAL IN |
| Stem Length | 5.8281 INCHES NOMINAL IN |
| Seat Angle in Deg | 45.0 |
| Chamfer Length | 0.0312 INCHES NOMINAL IN |
| Neck Radius | 0.3750 INCHES NOMINAL IN |
| Groove Diameter | 0.3290 INCHES MINIMUM AND 0.3350 INCHES MAXIMUM IN |
| Metallic Hardness Rating and Location | 36.0 ROCKWELL C MINIMUM STEM |
| Metallic Hardness Rating and Location | 43.0 ROCKWELL C MAXIMUM STEM |
| Distance From Groove to Stem End | 0.4850 INCHES MINIMUM AND 0.5050 INCHES MAXIMUM IN |
| Outside Diameter | 1.5000 INCHES NOMINAL IN |
| Stem Style | GROOVED |
| Head Style | FLAT |
| Carbon Relief Groove | NOT INCLUDED |
| Chamfer Angle in Deg | 45.0 |
| Groove Width | 0.0950 INCHES MINIMUM AND 0.1050 INCHES MAXIMUM IN |
| 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 |
|---|---|
| R61 PRIMARY | Hatch & Kirk, Inc. (USA) |
| YT199S61-0801PC9 | Naval Sea Systems Command (USA) |
| YTL1S61-854PC4 | Naval Sea Systems Command (USA) |
| YF292S61-841PC9 | Naval Sea Systems Command (USA) |
| S6100657463PC4 | Naval Sea Systems Command (USA) |
| S61657451PC70 | Naval Sea Systems Command (USA) |
| S6100539435PC25 | Naval Sea Systems Command (USA) |
| YT199S61-0814PC4 | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 4LR1PCR61 | 5/9 Secondary reference U.S. Government activity |
| 668APCR61 | 5/9 Secondary reference Hatch & Kirk, Inc. |
| 6LR101BPC9 | 5/9 Secondary reference Hatch & Kirk, Inc. |
| 6LR102CPC61 | 5/9 Secondary reference U.S. Government activity |
| 4LR101PC9 | 5/9 Secondary reference U.S. Government activity |
| 700PCR61 | 5/9 Secondary reference Hatch & Kirk, Inc. |
| YTL1S61-842PC44 | 5/9 Secondary reference U.S. Government activity |
| 738PCR61 | 5/9 Secondary reference U.S. Government activity |
| 682APCR61 | 5/9 Secondary reference U.S. Government activity |
| 4LR101BPC69 | 5/9 Secondary reference Hatch & Kirk, Inc. |
| 4LR102PC44 | 5/9 Secondary reference Hatch & Kirk, Inc. |
| R61 | 5/9 Secondary reference U.S. Government activity |
| 6LR142FPC9 | 5/9 Secondary reference Hatch & Kirk, Inc. |
| S6100657452PC44 | 5/9 Secondary reference U.S. Government activity |
| 4LR114APC4 | 5/9 Secondary reference Hatch & Kirk, Inc. |
| 4LR101BPC69 | 5/9 Secondary reference U.S. Government activity |
| 4LR18PC44 | 5/9 Secondary reference U.S. Government activity |
| 6LR102BPC61 | 5/9 Secondary reference U.S. Government activity |
| 682PCR61 | 5/9 Secondary reference Hatch & Kirk, Inc. |
| 6LR142FPC9 | 5/9 Secondary reference U.S. Government activity |
NSN 2815-00-288-3639 is a Valve,poppet,engine, manufactured by Hatch & Kirk, Inc., classified under FSC 2815, Diesel Engines and Components. Status: active.
NSN 2815-00-288-3639 has 8 manufacturer part numbers on file: R61 (Hatch & Kirk, Inc.), YT199S61-0801PC9 (Naval Sea Systems Command), YTL1S61-854PC4 (Naval Sea Systems Command), YF292S61-841PC9 (Naval Sea Systems Command), S6100657463PC4 (Naval Sea Systems Command) and 3 more.
4 possible matches (shared part number, not a government interchangeability claim): 2805-00-339-1392, 2815-00-355-1655, 5945-00-715-2190. Verify interchangeability with system specifications before substitution.
Key specifications for R61: Stem Diameter: 0.3720 INCHES MINIMUM AND 0.3730 INCHES MAXIMUM IN; FSC Application Data: DIESEL ENGINE; Head Height: 0.1719 INCHES NOMINAL IN; Stem Length: 5.8281 INCHES NOMINAL IN. 17 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.