The Valve,poppet,engine, cataloged under National Stock Number 2805-00-511-6269, is classified within Federal Supply Class 2805 (Gasoline Reciprocating Engines, Except Aircraft; and Components) of the Engines, Turbines, and Components group. The manufacturer of record is Brinkley Technology Group Llc Dba Hercules Manufacturing. Government technical data includes 25 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2805-00-511-6269 |
| Primary Part Number | 6407979 |
| Item Name | Valve,poppet,engine |
| FSC / FSG | 2805 / 28 — Gasoline Reciprocating Engines, Except Aircraft; and Components |
| Manufacturer | Brinkley Technology Group Llc Dba Hercules Manufacturing |
| Status | ACTIVE |
| Stem Diameter | 0.5270 INCHES MINIMUM AND 0.5280 INCHES MAXIMUM IN |
| FSC Application Data | GASOLINE ENGINE |
| Head Height | 0.2400 INCHES MINIMUM AND 0.2500 INCHES MAXIMUM IN |
| Second Groove Width | 0.1000 INCHES NOMINAL IN |
| Stem Length | 5.8460 INCHES MINIMUM AND 5.8810 INCHES MAXIMUM IN |
| Seat Angle in Deg | 29.0 |
| Chamfer Length | 0.0312 INCHES NOMINAL IN |
| Neck Radius | 0.8750 INCHES NOMINAL IN |
| Third Groove Diameter | 0.3390 INCHES MINIMUM AND 0.3440 INCHES MAXIMUM IN |
| Minor Outside Diameter | 0.4320 INCHES MINIMUM AND 0.4350 INCHES MAXIMUM IN |
| Metallic Hardness Rating and Location | 50.0 ROCKWELL C MINIMUM TIP |
| Outside Diameter | 2.7400 INCHES MINIMUM AND 2.7500 INCHES MAXIMUM IN |
| Distance From First Groove to Stem End | 0.0950 INCHES MINIMUM AND 0.1050 INCHES MAXIMUM IN |
| Stem Style | TAPERED MULTI-GROOVED |
| First Groove Diameter | 0.3390 INCHES MINIMUM AND 0.3440 INCHES MAXIMUM IN |
| Taper Angle in Deg | 15.0 |
| Head Style | INVERTED CONE |
| Distance From Second Groove to Stem End | 0.2555 INCHES MINIMUM AND 0.2605 INCHES MAXIMUM IN |
| Carbon Relief Groove | NOT INCLUDED |
| Third Groove Width | 0.1000 INCHES NOMINAL IN |
| Minor Diameter Length | 0.5160 INCHES MINIMUM AND 0.5230 INCHES MAXIMUM IN |
| Chamfer Angle in Deg | 45.0 |
| Second Groove Diameter | 0.3390 INCHES MINIMUM AND 0.3440 INCHES MAXIMUM IN |
| Distance From Third Groove to Stem End | 0.4160 INCHES MINIMUM AND 0.4210 INCHES MAXIMUM IN |
| First Groove Width | 0.1000 INCHES NOMINAL 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 |
|---|---|
| 6407979 PRIMARY | Brinkley Technology Group Llc Dba Hercules Manufacturing (USA) |
| 407979 | Brinkley Technology Group Llc Dba Hercules Manufacturing (USA) |
| Reference | Meaning |
|---|---|
| 6407979 | 5/9 Secondary reference Hercules Engine Co Inc |
| 407979 | 5/9 Secondary reference Hercules Engine Co Inc |
NSN 2805-00-511-6269 is a Valve,poppet,engine, manufactured by Brinkley Technology Group Llc Dba Hercules Manufacturing, classified under FSC 2805, Gasoline Reciprocating Engines, Except Aircraft; and Components. Status: active.
NSN 2805-00-511-6269 has 2 manufacturer part numbers on file: 6407979 (Brinkley Technology Group Llc Dba Hercules Manufacturing), 407979 (Brinkley Technology Group Llc Dba Hercules Manufacturing).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-446-8564. Verify interchangeability with system specifications before substitution.
Key specifications for 6407979: Stem Diameter: 0.5270 INCHES MINIMUM AND 0.5280 INCHES MAXIMUM IN; FSC Application Data: GASOLINE ENGINE; Head Height: 0.2400 INCHES MINIMUM AND 0.2500 INCHES MAXIMUM IN; Second Groove Width: 0.1000 INCHES NOMINAL IN. 25 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.