The Nut,union, cataloged under National Stock Number 4730-00-903-7841, 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 Pre-Mach Inc. Government technical data includes 9 specifications, cited from the U.S. Government catalog. The record lists 6 manufacturer part numbers 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through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 4730-00-903-7841 |
| Primary Part Number | A414241-7 |
| Item Name | Nut,union |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Pre-Mach Inc |
| Status | ACTIVE |
| Width Across Flats | 2.750 INCHES NOMINAL IN |
| Shoulder Step Width | 0.375 INCHES NOMINAL IN |
| Thread Series | UN |
| Material Document and Classification | MIL-S-6758 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Thread Direction | RIGHT-HAND |
| Nut Height | 1.500 INCHES NOMINAL IN |
| Material | STEEL COMP 4130 OVERALL |
| Smallest Inside Diameter | 1.903 INCHES NOMINAL IN |
| Shoulder Seat Diameter | 0.880 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 | S |
| Part Number | Manufacturer |
|---|---|
| A414241-7 | Pre-Mach Inc (USA) |
| A414241-7 | Nassau Tool Works, Inc (USA) |
| A414241-7 | Krobach Mfg. Corp. Dba Krobach Manufacturing Corp (USA) |
| A414241-7 | Duhadaway Tool & Die Shop Inc (USA) |
| A414241-7 | Ammcon Corp. (USA) |
| A414241-7 | Bec Systems Llc Dba Bec Machine Products (USA) |
| Reference | Meaning |
|---|---|
| A414241-7 | 5/9 Secondary reference U.S. Government activity |
| A414241-7 | 5/9 Secondary reference Master Research & Manufacturing, Inc. Dba Master Research & Manufacturing Inc |
| A414241-7 | 3/2 Design control — primary reference U.S. Government activity |
| A414241-7 | 5/9 Secondary reference Nuflo, Inc. |
| A414241-7 | 5/9 Secondary reference Computa-Base-Machining, Inc. |
| A414241-7 | 5/9 Secondary reference Calabrese & Sons, Inc. |
NSN 4730-00-903-7841 is a Nut,union, manufactured by Pre-Mach Inc, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-00-903-7841 has 6 manufacturer part numbers on file: A414241-7 (Pre-Mach Inc), A414241-7 (Nassau Tool Works, Inc), A414241-7 (Krobach Mfg. Corp. Dba Krobach Manufacturing Corp), A414241-7 (Duhadaway Tool & Die Shop Inc), A414241-7 (Ammcon Corp.) and 1 more.
Key specifications for A414241-7: Width Across Flats: 2.750 INCHES NOMINAL IN; Shoulder Step Width: 0.375 INCHES NOMINAL IN; Thread Series: UN; Material Document and Classification: MIL-S-6758 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL. 9 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.