The Nut,union, cataloged under National Stock Number 4730-00-902-7756, 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 Airtronics, Llc. Government technical data includes 10 specifications, cited from the U.S. Government catalog. The record lists 9 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through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 4730-00-902-7756 |
| Primary Part Number | A414240-6 |
| Item Name | Nut,union |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Airtronics, Llc |
| Status | ACTIVE |
| Width Across Flats | 3.000 INCHES NOMINAL IN |
| Shoulder Step Width | 0.313 INCHES MINIMUM AND 0.329 INCHES MAXIMUM IN |
| Shoulder Width | 0.313 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 | 1.250 INCHES NOMINAL IN |
| Material | STEEL COMP 4130 OVERALL |
| Smallest Inside Diameter | 2.378 INCHES MINIMUM AND 2.381 INCHES MAXIMUM IN |
| Shoulder Seat Diameter | 2.755 INCHES MINIMUM AND 2.765 INCHES MAXIMUM 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 |
|---|---|
| A414240-6 | Airtronics, Llc (USA) |
| A414240-6 | Duhadaway Tool & Die Shop Inc (USA) |
| A414240-6 | Hamill Manufacturing Company Dba Hamill Manufacturing Co (USA) |
| A414240-6 | Bec Systems Llc Dba Bec Machine Products (USA) |
| A414240-6 | Krobach Mfg. Corp. Dba Krobach Manufacturing Corp (USA) |
| A414240-6 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| A414240-6 | Pre-Mach Inc (USA) |
| A414240-6 | Ammcon Corp. (USA) |
| A414240-6 | Nassau Tool Works, Inc (USA) |
| Reference | Meaning |
|---|---|
| A414240-6 | 3/2 Design control — primary reference U.S. Government activity |
| A414240-6 | 5/9 Secondary reference Computa-Base-Machining, Inc. |
| A414240-6 | 5/9 Secondary reference Calabrese & Sons, Inc. |
| A414240-6 | 5/9 Secondary reference Master Research & Manufacturing, Inc. Dba Master Research & Manufacturing Inc |
| A414240-6 | 5/9 Secondary reference Huey Co |
| A414240-6 | 5/9 Secondary reference Nuflo, Inc. |
NSN 4730-00-902-7756 is a Nut,union, manufactured by Airtronics, Llc, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-00-902-7756 has 9 manufacturer part numbers on file: A414240-6 (Airtronics, Llc), A414240-6 (Duhadaway Tool & Die Shop Inc), A414240-6 (Hamill Manufacturing Company Dba Hamill Manufacturing Co), A414240-6 (Bec Systems Llc Dba Bec Machine Products), A414240-6 (Krobach Mfg. Corp. Dba Krobach Manufacturing Corp) and 4 more.
Key specifications for A414240-6: Width Across Flats: 3.000 INCHES NOMINAL IN; Shoulder Step Width: 0.313 INCHES MINIMUM AND 0.329 INCHES MAXIMUM IN; Shoulder Width: 0.313 INCHES NOMINAL IN; Thread Series: UN. 10 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.