The Guide,valve Stem, cataloged under National Stock Number 4820-01-268-9919, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is O T S I. Government technical data includes 17 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-268-9919 |
| Primary Part Number | 5905998 |
| Item Name | Guide,valve Stem |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | O T S I |
| Status | ACTIVE |
| Countersink Angle in Deg | 45.0 |
| Aa End Chamfer Angle in Deg | 45.0 |
| Aa End Chamfer Length | 0.031 INCHES NOMINAL IN |
| Major Diameter Length | 0.240 INCHES NOMINAL IN |
| Bb End Shank Diameter | 0.688 INCHES NOMINAL IN |
| Style Designator | PLAIN FLANGED |
| Material Document and Classification | QQ-S-764, TYPE 303-CANCELED FED SPEC 1ST MATERIAL RESPONSE |
| Bore Counterbore | NOT INCLUDED |
| Outside Diameter | 1.212 INCHES NOMINAL IN |
| Countersink Length | 0.031 INCHES NOMINAL IN |
| Bb End Chamfer Length | 0.060 INCHES NOMINAL IN |
| Bb End Chamfer Angle in Deg | 45.0 |
| Bore Diameter | 0.2540 INCHES NOMINAL IN |
| Material | STEEL COMP 303 |
| Shoulder First Fillet Radius | 0.015 INCHES NOMINAL IN |
| Bore Countersink | 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 |
NSN 4820-01-268-9919 is a Guide,valve Stem, manufactured by O T S I, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-268-9919 has 2 manufacturer part numbers on file: 5905998 (O T S I), 5905998 (Naval Sea Systems Command).
Key specifications for 5905998: Countersink Angle in Deg: 45.0; Aa End Chamfer Angle in Deg: 45.0; Aa End Chamfer Length: 0.031 INCHES NOMINAL IN; Major Diameter Length: 0.240 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.