The Back-Up Ring,preformed Packing, cataloged under National Stock Number 5330-01-516-5827, is classified within Federal Supply Class 5330 (Packing and Gasket Materials) of the Hardware and Abrasives group. The manufacturer of record is Greene Tweed & Co Inc. Government technical data includes 6 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5330-01-516-5827 |
| Primary Part Number | 7431MT-4780N |
| Item Name | Back-Up Ring,preformed Packing |
| FSC / FSG | 5330 / 53 — Packing and Gasket Materials |
| Manufacturer | Greene Tweed & Co Inc |
| Status | ACTIVE |
| Cross-Sectional Height | 0.090 INCHES NOMINAL IN |
| Material Document and Classification | 5F573,GTS-020 MFR REF SINGLE MATERIAL RESPONSE |
| Cross-Sectional Shape Style | SINGLE TURN SPIRAL |
| Peripheral Diameter | 5.724 INCHES NOMINAL IN |
| Center Hole Diameter | 5.402 INCHES NOMINAL IN |
| Material | PLASTIC POLYAMIDE NYLON |
| 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 |
|---|---|
| 7431MT-4780N PRIMARY | Greene Tweed & Co Inc (USA) |
| Reference | Meaning |
|---|---|
| 7M1189SN431-3 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
| 7431MT-4780N | 5/9 Secondary reference Palmetto Inc |
NSN 5330-01-516-5827 is a Back-Up Ring,preformed Packing, manufactured by Greene Tweed & Co Inc, classified under FSC 5330, Packing and Gasket Materials. Status: active.
NSN 5330-01-516-5827 has 1 manufacturer part number on file: 7431MT-4780N (Greene Tweed & Co Inc).
Key specifications for 7431MT-4780N: Cross-Sectional Height: 0.090 INCHES NOMINAL IN; Material Document and Classification: 5F573,GTS-020 MFR REF SINGLE MATERIAL RESPONSE; Cross-Sectional Shape Style: SINGLE TURN SPIRAL; Peripheral Diameter: 5.724 INCHES NOMINAL IN. 6 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.