The Retainer,disk,valve, cataloged under National Stock Number 4820-01-121-1901, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Dla Land and Maritime Dba Engineering and Technical Support Div Document Standardization Division (vendor Item Drawings). Government technical data includes 5 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-121-1901 |
| Primary Part Number | CS4820-SR-0714 |
| Item Name | Retainer,disk,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Dla Land and Maritime Dba Engineering and Technical Support Div Document Standardization Division (vendor Item Drawings) |
| Status | ACTIVE |
| Outside Diameter | 0.438 INCHES NOMINAL IN |
| Material Document and Classification | ASTM A582-80 ASSN STD SINGLE MATERIAL RESPONSE |
| Nominal Thread Size | 0.375 INCHES IN |
| Inside Diameter | 0.250 INCHES NOMINAL IN |
| Material | STEEL COMP 303 |
| 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 |
|---|---|
| CS4820-SR-0714 PRIMARY | Dla Land and Maritime Dba Engineering and Technical Support Div Document Standardization Division (vendor Item Drawings) (USA) |
| Reference | Meaning |
|---|---|
| SIE10041 REV D ITEM 6 | 5/2 Secondary reference U.S. Government activity |
| SIE10041 REV D | D/9 Drawing number reference only U.S. Government activity |
| V2B10637-3DA | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-01-121-1901 is a Retainer,disk,valve, manufactured by Dla Land and Maritime Dba Engineering and Technical Support Div Document Standardization Division (vendor Item Drawings), classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-121-1901 has 1 manufacturer part number on file: CS4820-SR-0714 (Dla Land and Maritime Dba Engineering and Technical Support Div Document Standardization Division (vendor Item Drawings)).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-124-2518. Verify interchangeability with system specifications before substitution.
Key specifications for CS4820-SR-0714: Outside Diameter: 0.438 INCHES NOMINAL IN; Material Document and Classification: ASTM A582-80 ASSN STD SINGLE MATERIAL RESPONSE; Overall Length: 0.375 INCHES NOMINAL IN; Nominal Thread Size: 0.375 INCHES IN. 5 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.