The Back-Up Ring,preformed Packing, cataloged under National Stock Number 5330-01-620-0039, is classified within Federal Supply Class 5330 (Packing and Gasket Materials) of the Hardware and Abrasives group. The manufacturer of record is Mission Systems Orchard Park Inc. Government technical data includes 3 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5330-01-620-0039 |
| Primary Part Number | B17045-1 |
| Item Name | Back-Up Ring,preformed Packing |
| FSC / FSG | 5330 / 53 — Packing and Gasket Materials |
| Manufacturer | Mission Systems Orchard Park Inc |
| Status | ACTIVE |
| Cross-Sectional Shape Style | SOLID |
| Specification/standard Data | MIL-R-8791 GOVERNMENT STANDARD |
| Material | PLASTIC |
| 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 |
|---|---|
| B17045-1 PRIMARY | Mission Systems Orchard Park Inc (USA) |
| Reference | Meaning |
|---|---|
| B17045-1 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5330-01-620-0039 is a Back-Up Ring,preformed Packing, manufactured by Mission Systems Orchard Park Inc, classified under FSC 5330, Packing and Gasket Materials. Status: active.
NSN 5330-01-620-0039 has 1 manufacturer part number on file: B17045-1 (Mission Systems Orchard Park Inc).
Key specifications for B17045-1: Cross-Sectional Shape Style: SOLID; Specification/standard Data: MIL-R-8791 GOVERNMENT STANDARD; Part Name Assigned by Controlling Agency: RING, BACKUP; Material: PLASTIC. 3 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.