The Guide,valve Stem, cataloged under National Stock Number 2815-00-678-3198, is classified within Federal Supply Class 2815 (Diesel Engines and Components) of the Engines, Turbines, and Components group. The manufacturer of record is U S Army Tank Automotive Command Amsta-Im-Mm. Government technical data includes 24 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 2815-00-678-3198 |
| Primary Part Number | 8725180 |
| Item Name | Guide,valve Stem |
| FSC / FSG | 2815 / 28 — Diesel Engines and Components |
| Manufacturer | U S Army Tank Automotive Command Amsta-Im-Mm |
| Status | ACTIVE |
| Shoulder Second Fillet Radius | 0.060 INCHES NOMINAL IN |
| Countersink Angle in Deg | 90.0 |
| Aa End Chamfer Angle in Deg | 45.0 |
| Countersink Diameter | 0.590 INCHES NOMINAL IN |
| Aa End Chamfer Length | 0.030 INCHES NOMINAL IN |
| Major Diameter Length | 0.122 INCHES MINIMUM AND 0.128 INCHES MAXIMUM IN |
| Bb End Shank Diameter | 0.753 INCHES NOMINAL IN |
| Style Designator | PLAIN-STEPPED SHOULDER |
| Bore Counterbore | NOT INCLUDED |
| Outside Diameter | 1.120 INCHES NOMINAL IN |
| Aa End Radius | 0.030 INCHES NOMINAL IN |
| Shoulder Diameter | 0.778 INCHES MINIMUM AND 0.784 INCHES MAXIMUM IN |
| Fillet Step Radius | 0.030 INCHES NOMINAL IN |
| Bb End Chamfer Length | 0.030 INCHES NOMINAL IN |
| Length From Aa End to Largest Diameter Face | 1.375 INCHES NOMINAL IN |
| Aa End Diameter | 0.745 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN |
| Bb End Chamfer Angle in Deg | 45.0 |
| Bb End Radius | 0.030 INCHES NOMINAL IN |
| Bore Diameter | 0.5450 INCHES MINIMUM AND 0.5470 INCHES MAXIMUM IN |
| Material | IRON ALLOY |
| Shoulder First Fillet Radius | 0.030 INCHES NOMINAL IN |
| Shoulder Length | 0.160 INCHES NOMINAL IN |
| Bore Countersink | NOT INCLUDED |
| Countersink Location | AA END AND BB END |
| 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 |
|---|---|
| 8725180 PRIMARY | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
| Reference | Meaning |
|---|---|
| 8725004 | D/9 Drawing number reference only U S Army Tank Automotive Command Amsta-Im-Mm |
NSN 2815-00-678-3198 is a Guide,valve Stem, manufactured by U S Army Tank Automotive Command Amsta-Im-Mm, classified under FSC 2815, Diesel Engines and Components. Status: active.
NSN 2815-00-678-3198 has 1 manufacturer part number on file: 8725180 (U S Army Tank Automotive Command Amsta-Im-Mm).
1 possible match (shared part number, not a government interchangeability claim): 2815-00-678-3202. Verify interchangeability with system specifications before substitution.
Key specifications for 8725180: Shoulder Second Fillet Radius: 0.060 INCHES NOMINAL IN; Countersink Angle in Deg: 90.0; Aa End Chamfer Angle in Deg: 45.0; Countersink Diameter: 0.590 INCHES NOMINAL IN. 24 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.