The Back-Up Ring,preformed Packing, cataloged under National Stock Number 5330-01-528-8499, is classified within Federal Supply Class 5330 (Packing and Gasket Materials) of the Hardware and Abrasives group. Government technical data includes 9 specifications, cited from the U.S. Government catalog. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5330-01-528-8499 |
| Item Name | Back-Up Ring,preformed Packing |
| FSC / FSG | 5330 / 53 — Packing and Gasket Materials |
| Status | ACTIVE |
| Cross-Sectional Thickness | 0.046 INCHES MINIMUM AND 0.052 INCHES MAXIMUM IN |
| Cross-Sectional Height | 0.138 INCHES MINIMUM AND 0.156 INCHES MAXIMUM IN |
| Criticality Code Justification | ZZZY |
| Material Document and Classification | MIL-R-8791 MIL SPEC SINGLE MATERIAL RESPONSE |
| Cross-Sectional Shape Style | DOUBLE SPIRAL |
| Peripheral Diameter | 5.724 INCHES MINIMUM AND 5.728 INCHES MAXIMUM IN |
| Center Hole Diameter | 5.250 INCHES NOMINAL IN |
| Material | PLASTIC POLYTETRAFLUOROETHYLENE |
| Reference Number Differentiating Characteristics | CLEANING, PACKAGING, AND MARKING IAW MIL-STD-1330D |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | S |
| Reference | Meaning |
|---|---|
| 801-6404589 FIND 12CP | 5/1 Secondary reference Naval Inventory Control Point Mechanicsburg |
| DF330618 FIND 12CP | 5/1 Secondary reference Naval Inventory Control Point Mechanicsburg |
| 211007889CP | 5/1 Secondary reference Naval Inventory Control Point Mechanicsburg |
| CD-023-35-12CP | 5/1 Secondary reference Naval Inventory Control Point Mechanicsburg |
| MS28782-58CP | 3/1 Design control — primary reference Naval Inventory Control Point Mechanicsburg |
NSN 5330-01-528-8499 is a Back-Up Ring,preformed Packing, classified under FSC 5330, Packing and Gasket Materials. Status: active.
Key specifications for 5330-01-528-8499: Cross-Sectional Thickness: 0.046 INCHES MINIMUM AND 0.052 INCHES MAXIMUM IN; Cross-Sectional Height: 0.138 INCHES MINIMUM AND 0.156 INCHES MAXIMUM IN; Criticality Code Justification: ZZZY; Material Document and Classification: MIL-R-8791 MIL SPEC SINGLE MATERIAL RESPONSE. 9 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.