The Retainer,packing, cataloged under National Stock Number 5330-01-191-0531, is classified within Federal Supply Class 5330 (Packing and Gasket Materials) of the Hardware and Abrasives group. The manufacturer of record is William Powell Company, the Dba Powell Valve Div the Starflo Corporation. Government technical data includes 11 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. 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 | 5330-01-191-0531 |
| Primary Part Number | 050791 ITEM 25 |
| Item Name | Retainer,packing |
| FSC / FSG | 5330 / 53 — Packing and Gasket Materials |
| Manufacturer | William Powell Company, the Dba Powell Valve Div the Starflo Corporation |
| Status | ACTIVE |
| Attachment Hole Diameter | 0.070 INCHES NOMINAL IN |
| Attachment Feature Quantity | 1 |
| Cross-Sectional Height | 1.031 INCHES MINIMUM AND 1.041 INCHES MAXIMUM IN |
| Precious Material | SILVER |
| Cross-Sectional Shape Style | U |
| Peripheral Diameter | 4.484 INCHES NOMINAL IN |
| Surface Treatment | SILVER OVERALL |
| Center Hole Diameter | 3.688 INCHES MINIMUM AND 3.704 INCHES MAXIMUM IN |
| Precious Material and Location | EXTERNAL SURFACES SILVER |
| Material | IRON ALLOY OVERALL |
| Attachment Method | ROUND HOLE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 117972 | William Powell Company, the Dba Powell Valve Div the Starflo Corporation (USA) |
| 050791 ITEM 25 PRIMARY | William Powell Company, the Dba Powell Valve Div the Starflo Corporation (USA) |
NSN 5330-01-191-0531 is a Retainer,packing, manufactured by William Powell Company, the Dba Powell Valve Div the Starflo Corporation, classified under FSC 5330, Packing and Gasket Materials. Status: active.
NSN 5330-01-191-0531 has 2 manufacturer part numbers on file: 117972 (William Powell Company, the Dba Powell Valve Div the Starflo Corporation), 050791 ITEM 25 (William Powell Company, the Dba Powell Valve Div the Starflo Corporation).
1 possible match (shared part number, not a government interchangeability claim): 5330-01-421-1892. Verify interchangeability with system specifications before substitution.
Key specifications for 050791 ITEM 25: Attachment Hole Diameter: 0.070 INCHES NOMINAL IN; Attachment Feature Quantity: 1; Cross-Sectional Height: 1.031 INCHES MINIMUM AND 1.041 INCHES MAXIMUM IN; Precious Material: SILVER. 11 specifications are documented in the U.S. Government catalog.
Possible hazard — SDS may be required (DLA HMIC P). 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.