The Nut,union, cataloged under National Stock Number 4730-01-121-2750, 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 14 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-121-2750 |
| Primary Part Number | 2621-713-01PC20 |
| Item Name | Nut,union |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Derbyshire Machine & Tool Co |
| Status | ACTIVE |
| Shoulder Step Width | 0.385 INCHES NOMINAL IN |
| Shoulder Width | 0.300 INCHES NOMINAL IN |
| Thread Series | UN |
| Material Document and Classification | MIL-C-20159,TYPE I MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 3.062 INCHES IN |
| Nut Diameter | 3.500 INCHES NOMINAL IN |
| Nut Height | 1.500 INCHES NOMINAL IN |
| Nut Style | ROUND |
| Thread Class | 2B |
| Thread Quantity Per Inch | 12 |
| Material | COPPER ALLOY OVERALL |
| Smallest Inside Diameter | 2.650 INCHES NOMINAL IN |
| Shoulder Seat Diameter | 2.660 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 |
|---|---|
| 2621-713-01PC20 PRIMARY | Derbyshire Machine & Tool Co (USA) |
| Reference | Meaning |
|---|---|
| 2621-713-01 | D/9 Drawing number reference only U.S. Government activity |
| 2621-713-01 PIECE 20 | 3/2 Design control — primary reference U.S. Government activity |
| 2621-713-01 PC2 | C/1 Advisory reference — outside the item-of-supply concept Derbyshire Machine & Tool Co |
NSN 4730-01-121-2750 is a Nut,union, manufactured by Derbyshire Machine & Tool Co, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-121-2750 has 1 manufacturer part number on file: 2621-713-01PC20 (Derbyshire Machine & Tool Co).
Key specifications for 2621-713-01PC20: Shoulder Step Width: 0.385 INCHES NOMINAL IN; Shoulder Width: 0.300 INCHES NOMINAL IN; Thread Series: UN; Material Document and Classification: MIL-C-20159,TYPE I MIL SPEC SINGLE MATERIAL RESPONSE OVERALL. 14 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.