The Parts Kit,pilot Control Valve, cataloged under National Stock Number 4820-01-421-1644, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is O. C. Keckley Company. Government technical data includes 4 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-421-1644 |
| Primary Part Number | T7027-A |
| Item Name | Parts Kit,pilot Control Valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | O. C. Keckley Company |
| Status | ACTIVE |
| Component Quantity | 4 |
| End Item Source | 32869 |
| End Item Name | VALVE |
| Nonsupply Items and Quantities | PILOT VALVE CAP 1; PILOT VALVE SPRING 1; PILOT VALVE VALVE 1; PILOT VALVE CAGE 1 |
| 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 |
|---|---|
| T7027-A PRIMARY | O. C. Keckley Company (USA) |
| 25366A PIECE 12 | O. C. Keckley Company (USA) |
| Reference | Meaning |
|---|---|
| 25366A PIECE 13 TO 16 | 5/1 Secondary reference O. C. Keckley Company |
| 25366A | D/9 Drawing number reference only O. C. Keckley Company |
NSN 4820-01-421-1644 is a Parts Kit,pilot Control Valve, manufactured by O. C. Keckley Company, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-421-1644 has 2 manufacturer part numbers on file: T7027-A (O. C. Keckley Company), 25366A PIECE 12 (O. C. Keckley Company).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-421-6828. Verify interchangeability with system specifications before substitution.
Key specifications for T7027-A: Component Quantity: 4; End Item Source: 32869; End Item Name: VALVE; Nonsupply Items and Quantities: PILOT VALVE CAP 1; PILOT VALVE SPRING 1; PILOT VALVE VALVE 1; PILOT VALVE CAGE 1. 4 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.