The Nut,union, cataloged under National Stock Number 4730-00-904-5181, 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 Ammcon Corp.. Government technical data includes 12 specifications, cited from the U.S. Government catalog. The record lists 8 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through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 4730-00-904-5181 |
| Primary Part Number | B414240-3 |
| Item Name | Nut,union |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Ammcon Corp. |
| Status | ACTIVE |
| Width Across Flats | 2.000 INCHES NOMINAL IN |
| Shoulder Step Width | 0.250 INCHES NOMINAL IN |
| Shoulder Width | 0.375 INCHES NOMINAL IN |
| Thread Series | UNS |
| Material Document and Classification | IL-S-6758,COND MIL SPEC 10TH MATERIAL RESPONSE OVERALL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 1.750 INCHES IN |
| Nut Height | 1.188 INCHES NOMINAL IN |
| Nut Style | HEXAGON |
| Thread Class | 3B |
| Thread Quantity Per Inch | 12 |
| Material | STEEL CORROSION RESISTING OVERALL |
| 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 |
|---|---|
| B414240-3 | Ammcon Corp. (USA) |
| B414240-3 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| B414240-3 | Hamill Manufacturing Company Dba Hamill Manufacturing Co (USA) |
| B414240-3 | Bec Systems Llc Dba Bec Machine Products (USA) |
| B414240-3 | Pre-Mach Inc (USA) |
| B414240-3 | Duhadaway Tool & Die Shop Inc (USA) |
| B414240-3 | Nassau Tool Works, Inc (USA) |
| B414240-3 | Krobach Mfg. Corp. Dba Krobach Manufacturing Corp (USA) |
| Reference | Meaning |
|---|---|
| B414240-3 | 5/9 Secondary reference Master Research & Manufacturing, Inc. Dba Master Research & Manufacturing Inc |
| B414240-3 | 5/9 Secondary reference U.S. Government activity |
| B414240-3 | 3/2 Design control — primary reference U.S. Government activity |
| B414240-3 | 5/9 Secondary reference Calabrese & Sons, Inc. |
| B414240-3 | 5/9 Secondary reference Computa-Base-Machining, Inc. |
| B414240-3 | 5/9 Secondary reference Nuflo, Inc. |
NSN 4730-00-904-5181 is a Nut,union, manufactured by Ammcon Corp., classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-00-904-5181 has 8 manufacturer part numbers on file: B414240-3 (Ammcon Corp.), B414240-3 (Sps Technologies, Llc Dba PB Fasteners), B414240-3 (Hamill Manufacturing Company Dba Hamill Manufacturing Co), B414240-3 (Bec Systems Llc Dba Bec Machine Products), B414240-3 (Pre-Mach Inc) and 3 more.
Key specifications for B414240-3: Width Across Flats: 2.000 INCHES NOMINAL IN; Shoulder Step Width: 0.250 INCHES NOMINAL IN; Shoulder Width: 0.375 INCHES NOMINAL IN; Thread Series: UNS. 12 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.