The Guide,valve Stem, cataloged under National Stock Number 4820-01-491-0791, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Bray Valve and Controls Usa. Government technical data includes 1 specification, 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-491-0791 |
| Primary Part Number | SK-991158 |
| Item Name | Guide,valve Stem |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Bray Valve and Controls Usa |
| Status | ACTIVE |
| Material | NICKEL ALLOY |
| 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 |
|---|---|
| ES1A-0392 ITEM NO.6 | Bray Valve and Controls Usa (USA) |
| SK-991158 PRIMARY | Bray Valve and Controls Usa (USA) |
| Reference | Meaning |
|---|---|
| ES1A-0392 | D/9 Drawing number reference only Bray Valve and Controls Usa |
NSN 4820-01-491-0791 is a Guide,valve Stem, manufactured by Bray Valve and Controls Usa, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-491-0791 has 2 manufacturer part numbers on file: ES1A-0392 ITEM NO.6 (Bray Valve and Controls Usa), SK-991158 (Bray Valve and Controls Usa).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-491-0795. Verify interchangeability with system specifications before substitution.
Key specifications for SK-991158: End Item Identification: E/I:VALVE,DAMPER,10 INCH. IN; Material: NICKEL ALLOY. 1 specification is 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.