The Tailpiece,union, cataloged under National Stock Number 4730-01-321-8559, 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 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through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-321-8559 |
| Primary Part Number | 2621-791-01 PIECE 169A |
| Item Name | Tailpiece,union |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Derbyshire Machine & Tool Co |
| Status | ACTIVE |
| Nominal Pipe Size Designation | 2.500 INCHES IN |
| End Connection Type | WELDED |
| Material | STEEL COMP 304 |
| 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 |
|---|---|
| 2621-791-01 PIECE 169A PRIMARY | Derbyshire Machine & Tool Co (USA) |
| Reference | Meaning |
|---|---|
| 2621-791-01 PIECE 169A | 5/2 Secondary reference U.S. Government activity |
| 513-4683637 | D/9 Drawing number reference only U.S. Government activity |
| 16-97-0414 | 3/2 Design control — primary reference U.S. Government activity |
| 2621-791-01 | D/9 Drawing number reference only U.S. Government activity |
| 513-4683637 ITEM F8 | 5/2 Secondary reference U.S. Government activity |
| 513-4683784 ITEM F3 | 5/2 Secondary reference U.S. Government activity |
NSN 4730-01-321-8559 is a Tailpiece,union, manufactured by Derbyshire Machine & Tool Co, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-321-8559 has 1 manufacturer part number on file: 2621-791-01 PIECE 169A (Derbyshire Machine & Tool Co).
Key specifications for 2621-791-01 PIECE 169A: Nominal Pipe Size Designation: 2.500 INCHES IN; End Connection Type: WELDED; Material: STEEL COMP 304. 3 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.