The Back-Up Ring,preformed Packing, cataloged under National Stock Number 5330-01-553-1763, is classified within Federal Supply Class 5330 (Packing and Gasket Materials) of the Hardware and Abrasives group. The manufacturer of record is Naval Inventory Control Point Mechanicsburg. Government technical data includes 7 specifications, cited from the U.S. Government catalog. The record lists 4 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5330-01-553-1763 |
| Primary Part Number | 551-6685222 PC NO.15CP |
| Item Name | Back-Up Ring,preformed Packing |
| FSC / FSG | 5330 / 53 — Packing and Gasket Materials |
| Manufacturer | Naval Inventory Control Point Mechanicsburg |
| Status | ACTIVE |
| Cross-Sectional Height | 0.119 INCHES NOMINAL IN |
| Criticality Code Justification | ZZZW |
| Cross-Sectional Shape Style | SOLID |
| Departure From Cited Document | CLEANING, PACKAGING, AND MARKING IAW MIL-STD-1330D |
| Peripheral Diameter | 3.368 INCHES NOMINAL IN |
| Center Hole Diameter | 3.130 INCHES NOMINAL IN |
| Material | PLASTIC POLYTETRAFLUOROETHYLENE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | S |
| Part Number | Manufacturer |
|---|---|
| 551-6685222 PC NO.15CP | Naval Inventory Control Point Mechanicsburg (USA) |
| 551-6685221 PC NO.15CP | Naval Inventory Control Point Mechanicsburg (USA) |
| M8791/1-235CP | Naval Inventory Control Point Mechanicsburg (USA) |
| CD-023-39-15CP | Naval Inventory Control Point Mechanicsburg (USA) |
| Reference | Meaning |
|---|---|
| MS27595-235CP | 5/1 Secondary reference U.S. Government activity |
| M8791/1-235 | 5/1 Secondary reference U.S. Government activity |
| 551-6685221 PC NO.15 | 5/1 Secondary reference Naval Sea Systems Command |
| 551-6685222 PC NO.15 | 5/1 Secondary reference Naval Sea Systems Command |
| CD-023-38-15CP | 3/1 Design control — primary reference Naval Inventory Control Point Mechanicsburg |
NSN 5330-01-553-1763 is a Back-Up Ring,preformed Packing, manufactured by Naval Inventory Control Point Mechanicsburg, classified under FSC 5330, Packing and Gasket Materials. Status: active.
NSN 5330-01-553-1763 has 4 manufacturer part numbers on file: 551-6685222 PC NO.15CP (Naval Inventory Control Point Mechanicsburg), 551-6685221 PC NO.15CP (Naval Inventory Control Point Mechanicsburg), M8791/1-235CP (Naval Inventory Control Point Mechanicsburg), CD-023-39-15CP (Naval Inventory Control Point Mechanicsburg).
Key specifications for 551-6685222 PC NO.15CP: Cross-Sectional Height: 0.119 INCHES NOMINAL IN; Criticality Code Justification: ZZZW; Cross-Sectional Shape Style: SOLID; Departure From Cited Document: CLEANING, PACKAGING, AND MARKING IAW MIL-STD-1330D. 7 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.