The Elbow,flange, cataloged under National Stock Number 4730-01-318-2844, 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 8 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-318-2844 |
| Primary Part Number | 2621-166-01 PIECE 153 MOD |
| 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 |
| Connection Type | FLANGE ALL ENDS |
| Material Document and Classification | MIL-C-20159,TYPE1 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Leg Length | 7.000 INCHES NOMINAL ALL ENDS IN |
| Nominal Outside Diameter | 4.000 INCHES ALL ENDS IN |
| Material | NICKEL ALLOY OVERALL |
| Nominal Thickness | 1.420 INCHES ALL ENDS 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 |
|---|---|
| 2621-166-01 PIECE 153 MOD PRIMARY | Derbyshire Machine & Tool Co (USA) |
| Reference | Meaning |
|---|---|
| 4684449 | D/9 Drawing number reference only U.S. Government activity |
| 2621-166-01 PIECE 153 MOD | 3/2 Design control — primary reference U.S. Government activity |
| 2621-166-01 | D/9 Drawing number reference only U.S. Government activity |
| 4684449-T/F85 | 5/2 Secondary reference U.S. Government activity |
NSN 4730-01-318-2844 is a Elbow,flange, manufactured by Derbyshire Machine & Tool Co, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-318-2844 has 1 manufacturer part number on file: 2621-166-01 PIECE 153 MOD (Derbyshire Machine & Tool Co).
3 possible matches (shared part number, not a government interchangeability claim): 4730-01-318-2845, 4730-01-325-6966, 4730-01-343-0477. Verify interchangeability with system specifications before substitution.
Key specifications for 2621-166-01 PIECE 153 MOD: Flange Shape: ROUND WITH HOLES ALL ENDS; Flow Angle: 90.0 DEGREES; Connection Type: FLANGE ALL ENDS; Material Document and Classification: MIL-C-20159,TYPE1 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL. 8 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.