The Packing with Retainer, cataloged under National Stock Number 5330-01-028-0831, is classified within Federal Supply Class 5330 (Packing and Gasket Materials) of the Hardware and Abrasives group. The manufacturer of record is Tech-Syn Corporation Dba Tech-Syn Corp. Government technical data includes 8 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5330-01-028-0831 |
| Primary Part Number | NM304-75 |
| Item Name | Packing with Retainer |
| FSC / FSG | 5330 / 53 — Packing and Gasket Materials |
| Manufacturer | Tech-Syn Corporation Dba Tech-Syn Corp |
| Status | ACTIVE |
| Retainer Inside Diameter | 0.333 INCHES NOMINAL IN |
| Packing Inside Diameter | 0.239 INCHES NOMINAL IN |
| Outside Diameter | 0.500 INCHES NOMINAL IN |
| Packing Ring Cross-Sectional Diameter | 0.051 INCHES NOMINAL IN |
| Material Document and Classification | MIL-P-25732 MIL SPEC SINGLE MATERIAL RESPONSE PACKING |
| Retainer Thickness | 0.040 INCHES NOMINAL IN |
| Material | RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR PACKING |
| Construction | TWO-PIECE |
| 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 |
|---|---|
| NM304-75 | Tech-Syn Corporation Dba Tech-Syn Corp (USA) |
| Reference | Meaning |
|---|---|
| 800-201 1/4 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5330-01-028-0831 is a Packing with Retainer, manufactured by Tech-Syn Corporation Dba Tech-Syn Corp, classified under FSC 5330, Packing and Gasket Materials. Status: active.
NSN 5330-01-028-0831 has 1 manufacturer part number on file: NM304-75 (Tech-Syn Corporation Dba Tech-Syn Corp).
Key specifications for NM304-75: Retainer Inside Diameter: 0.333 INCHES NOMINAL IN; Packing Inside Diameter: 0.239 INCHES NOMINAL IN; Outside Diameter: 0.500 INCHES NOMINAL IN; Packing Ring Cross-Sectional Diameter: 0.051 INCHES NOMINAL IN. 8 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.