The Guide,valve Stem, cataloged under National Stock Number 4820-01-481-9819, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 15 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-481-9819 |
| Item Name | Guide,valve Stem |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Aa End Chamfer Angle in Deg | 45.0 |
| Aa End Chamfer Length | 0.094 INCHES NOMINAL IN |
| Major Diameter Length | 1.313 INCHES NOMINAL IN |
| Bb End Shank Diameter | 15.375 INCHES NOMINAL IN |
| Style Designator | PLAIN FLANGED |
| Bore Counterbore | NOT INCLUDED |
| Outside Diameter | 15.660 INCHES NOMINAL IN |
| Aa End Radius | 0.250 INCHES NOMINAL IN |
| Bb End Chamfer Length | 0.500 INCHES NOMINAL IN |
| Bb End Chamfer Angle in Deg | 45.0 |
| Bb End Radius | 0.063 INCHES NOMINAL IN |
| Bore Diameter | 16.6250 INCHES NOMINAL IN |
| Material | STEEL |
| Metallic Hardness Rating | 36.0 NOMINAL ROCKWELL C |
| Bore Countersink | NOT INCLUDED |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 803-2177518 | D/9 Drawing number reference only U.S. Government activity |
| 803-2177518-16XX-91 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-01-481-9819 is a Guide,valve Stem, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-01-481-9819: Aa End Chamfer Angle in Deg: 45.0; Aa End Chamfer Length: 0.094 INCHES NOMINAL IN; Major Diameter Length: 1.313 INCHES NOMINAL IN; Bb End Shank Diameter: 15.375 INCHES NOMINAL IN. 15 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.