The Piston,valve, cataloged under National Stock Number 4810-00-402-5979, is classified within Federal Supply Class 4810 (Valves, Powered) of the Valves group. The manufacturer of record is Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 2 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 | 4810-00-402-5979 |
| Primary Part Number | 211656 |
| Item Name | Piston,valve |
| FSC / FSG | 4810 / 48 — Valves, Powered |
| Manufacturer | Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic |
| Status | ACTIVE |
| 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 |
|---|---|
| 211656 PRIMARY | Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic (USA) |
NSN 4810-00-402-5979 is a Piston,valve, manufactured by Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic, classified under FSC 4810, Valves, Powered. Status: active.
NSN 4810-00-402-5979 has 1 manufacturer part number on file: 211656 (Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic).
2 possible matches (shared part number, not a government interchangeability claim): 6750-01-427-2221, 5306-01-469-3318. Verify interchangeability with system specifications before substitution.
Key specifications for 211656: Special Features: STEEL; O/A H 0.682 IN.; OD 0.865 IN.; ID 0.625 IN.; BORE DIA 0.312 IN.; BORE DEPTH 0.250 IN.; TWO GROOVES 0.095 IN. W; GROOVE DIA. 0.728 IN. IN. 0 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.