The Disc Assembly,holde, cataloged under National Stock Number 4820-00-217-2747, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Derbyshire Machine & Tool Co. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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.
| Item Name | Disc Assembly,holde |
| FSC / FSG | 4820 — Valves, Nonpowered (FSG 48) |
| Manufacturers | Derbyshire Machine & Tool Co (CAGE 71905) |
| Parameter | Value |
|---|---|
| NSN | 4820-00-217-2747 |
| Primary Part Number | S558 |
| Item Name | Disc Assembly,holde |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Derbyshire Machine & Tool Co |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Part Number | Manufacturer |
|---|---|
| S558 PRIMARY | Derbyshire Machine & Tool Co (USA) |
| Reference | Meaning |
|---|---|
| SS564S4900-936725PC4-5 | 3/2 Design control — primary reference U.S. Government activity |
| SS564S4824-937814PC4-5 | 3/2 Design control — primary reference U.S. Government activity |
| 2900-142PC4-5 | 5/9 Secondary reference U.S. Government activity |
| 3763APC4-5 | 5/9 Secondary reference Forway Industries Inc |
| 2976-70PC4-5 | 5/9 Secondary reference U.S. Government activity |
NSN 4820-00-217-2747 is a Disc Assembly,holde, manufactured by Derbyshire Machine & Tool Co, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-217-2747 has 1 manufacturer part number on file: S558 (Derbyshire Machine & Tool Co).
1 possible match (shared part number, not a government interchangeability claim): 4730-01-255-9913. Verify interchangeability with system specifications before substitution.
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.