The Guide,valve Stem, cataloged under National Stock Number 2815-00-423-4563, is classified within Federal Supply Class 2815 (Diesel Engines and Components) of the Engines, Turbines, and Components group. The manufacturer of record is Cooper Machinery Services Llc. Government technical data includes 16 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government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 | 2815-00-423-4563 |
| Primary Part Number | R-1123 |
| Item Name | Guide,valve Stem |
| FSC / FSG | 2815 / 28 — Diesel Engines and Components |
| Manufacturer | Cooper Machinery Services Llc |
| Status | ACTIVE |
| Countersink Angle in Deg | 45.0 |
| Aa End Chamfer Angle in Deg | 45.0 |
| Countersink Diameter | 1.267 INCHES NOMINAL IN |
| Aa End Chamfer Length | 0.125 INCHES NOMINAL IN |
| Major Diameter Length | 3.795 INCHES NOMINAL IN |
| Bb End Shank Diameter | 1.866 INCHES NOMINAL IN |
| Style Designator | PLAIN, SHOULDERED |
| Bore Counterbore | NOT INCLUDED |
| Outside Diameter | 2.125 INCHES NOMINAL IN |
| Countersink Length | 0.075 INCHES NOMINAL IN |
| Bb End Chamfer Length | 0.100 INCHES NOMINAL IN |
| Bb End Chamfer Angle in Deg | 45.0 |
| Bore Diameter | 1.1170 INCHES NOMINAL IN |
| Material | STEEL |
| Bore Countersink | INCLUDED |
| Countersink Location | 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 |
|---|---|
| R-1123 PRIMARY | Cooper Machinery Services Llc (USA) |
| Reference | Meaning |
|---|---|
| 9866 | 5/9 Secondary reference Cooper Machinery Services Llc |
| 49866-1 | 5/9 Secondary reference Cooper Machinery Services Llc |
NSN 2815-00-423-4563 is a Guide,valve Stem, manufactured by Cooper Machinery Services Llc, classified under FSC 2815, Diesel Engines and Components. Status: active.
NSN 2815-00-423-4563 has 1 manufacturer part number on file: R-1123 (Cooper Machinery Services Llc).
4 possible matches (shared part number, not a government interchangeability claim): 4510-01-218-8440, 2540-01-284-1676, 5120-01-399-9117. Verify interchangeability with system specifications before substitution.
Key specifications for R-1123: Countersink Angle in Deg: 45.0; Aa End Chamfer Angle in Deg: 45.0; Countersink Diameter: 1.267 INCHES NOMINAL IN; Aa End Chamfer Length: 0.125 INCHES NOMINAL IN. 16 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.