The Elbow,flange, cataloged under National Stock Number 4730-01-320-1640, 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 Derbyshire Machine & Tool Co. Government technical data includes 12 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-320-1640 |
| Primary Part Number | 2621-166-03 PCR148 |
| Item Name | Elbow,flange |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Derbyshire Machine & Tool Co |
| Status | ACTIVE |
| Flange Shape | ROUND WITH HOLES ALL ENDS |
| Flow Angle | 90.0 DEGREES |
| Flange Face Design | PLAIN ALL ENDS |
| Bolt Circle Nominal Diameter | 7.188 INCHES ALL ENDS IN |
| Connection Type | FLANGE ALL ENDS |
| Material Document and Classification | MIL-C-20159,TYPE1 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Bolt Hole Nominal Diameter | 0.688 INCHES ALL ENDS IN |
| Leg Length | 7.880 INCHES NOMINAL ALL ENDS IN |
| Nominal Outside Diameter | 8.690 INCHES ALL ENDS IN |
| Bolt Hole Quantity | 10 ALL ENDS |
| Material | NICKEL ALLOY OVERALL |
| Nominal Thickness | 1.380 INCHES ALL ENDS IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 2621-166-03 PCR148 PRIMARY | Derbyshire Machine & Tool Co (USA) |
| Reference | Meaning |
|---|---|
| 2621-166-03 | D/9 Drawing number reference only U.S. Government activity |
| 2621-166-03 PCR148 | 5/2 Secondary reference U.S. Government activity |
| 704-4685262 ITEM F3 | 5/2 Secondary reference U.S. Government activity |
| 704-4685262 | D/9 Drawing number reference only U.S. Government activity |
NSN 4730-01-320-1640 is a Elbow,flange, manufactured by Derbyshire Machine & Tool Co, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-320-1640 has 1 manufacturer part number on file: 2621-166-03 PCR148 (Derbyshire Machine & Tool Co).
1 possible match (shared part number, not a government interchangeability claim): 5930-01-374-8328. Verify interchangeability with system specifications before substitution.
Key specifications for 2621-166-03 PCR148: Flange Shape: ROUND WITH HOLES ALL ENDS; Flow Angle: 90.0 DEGREES; Flange Face Design: PLAIN ALL ENDS; Bolt Circle Nominal Diameter: 7.188 INCHES ALL ENDS IN. 12 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.
NSN 4730-01-320-1640 has DEMIL Code B. Demilitarization may be required before disposal or transfer to non-military entities.
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.