The Flange,pipe, cataloged under National Stock Number 4730-01-535-6504, is classified within Federal Supply Class 4730 (Hose, Pipe, Tube, Lubrication, and Railing Fittings) of the Pipe, Tubing, Hose, and Fittings group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 17 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 4730-01-535-6504 |
| Primary Part Number | 6641060PC120 |
| Item Name | Flange,pipe |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Flange Diameter | 10.000 INCHES NOMINAL IN |
| Face Seating Surface Condition | MACHINED |
| Nominal Pipe Size for Which Designed | 5.000 INCHES IN |
| Socket Depth | 1.030 INCHES NOMINAL IN |
| Flange Section Style | PLAIN FACE, SOCKET NECK |
| Style Designator | ROUND, TWO BOLT HOLE CIRCLES |
| Outer Bolt Circle Hole Diameter | 0.656 INCHES NOMINAL IN |
| Material Document and Classification | QQ-N-281, CL A FED SPEC SINGLE MATERIAL RESPONSE |
| Inner Bolt Circle Hole Diameter | 0.230 INCHES NOMINAL IN |
| Unthreaded Reducer Hole Diameter | 3.500 INCHES NOMINAL IN |
| Outer Bolt Circle Hole Quantity | 5 |
| Recess Diameter | 5.200 INCHES NOMINAL IN |
| Inner Bolt Circle Diameter | 4.250 INCHES NOMINAL IN |
| Material | COPPER AND NICKEL ALLOY |
| Outer Bolt Circle Diameter | 6.625 INCHES NOMINAL IN |
| Inner Bolt Circle Hole Quantity | 3 |
| Thickness | 2.000 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 6641060PC120 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 801-6641060PC120 | 5/9 Secondary reference Naval Sea Systems Command |
NSN 4730-01-535-6504 is a Flange,pipe, manufactured by Naval Sea Systems Command, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-535-6504 has 1 manufacturer part number on file: 6641060PC120 (Naval Sea Systems Command).
Key specifications for 6641060PC120: Flange Diameter: 10.000 INCHES NOMINAL IN; Face Seating Surface Condition: MACHINED; Nominal Pipe Size for Which Designed: 5.000 INCHES IN; Socket Depth: 1.030 INCHES NOMINAL IN. 17 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). 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.