The Inverted Nut,tube Coupling, cataloged under National Stock Number 4730-00-274-8113, 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 U S Army Tank Automotive Command Amsta-Im-Mm. Government technical data includes 12 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through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 4730-00-274-8113 |
| Primary Part Number | 8720791 |
| Item Name | Inverted Nut,tube Coupling |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | U S Army Tank Automotive Command Amsta-Im-Mm |
| Status | ACTIVE |
| Width Across Flats | 0.500 INCHES NOMINAL IN |
| Seat Angle in Deg | 0.063 |
| Tube Outside Diameter for Which Designed | 0.313 INCHES NOMINAL IN |
| Style Designator | INVERTED NUT, TUBE, FLARE |
| Material Document and Classification | QQ-B-626, ALLOY 360 FED SPEC SINGLE MATERIAL RESPONSE |
| Thread Direction | RIGHT-HAND |
| Casehardening Indicator | NOT CASEHARDENED |
| Thread Size | 1/2-24 |
| Screw Thread Series Designator | UNS |
| Thread Class | 2A A |
| Material | COPPER ALLOY 360 |
| Smallest Inside Diameter | 0.321 INCHES MINIMUM AND 0.325 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 | X |
| Part Number | Manufacturer |
|---|---|
| 8720791 | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
| Reference | Meaning |
|---|---|
| 489849 | 5/9 Secondary reference Meggitt Troy Inc |
| 4730002748113 | 5/9 Secondary reference E.c.a Etablissement Centrald'approvisionnement Des Forces Armee |
| 489849-78385 | 5/9 Secondary reference Demarkus Corp Refrigeration Engineering Corp |
| 4730002748113 | 6/9 Informative reference only E.c.a Etablissement Central Des Approvisionnements Des Forces Armees Royales |
| 8720791 | 3/9 Design control — primary reference Pioneer Engineering and Mfg Co |
| 489849 | 5/9 Secondary reference Stewart-Warner Corporation |
NSN 4730-00-274-8113 is a Inverted Nut,tube Coupling, manufactured by U S Army Tank Automotive Command Amsta-Im-Mm, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-00-274-8113 has 1 manufacturer part number on file: 8720791 (U S Army Tank Automotive Command Amsta-Im-Mm).
Key specifications for 8720791: Width Across Flats: 0.500 INCHES NOMINAL IN; Seat Angle in Deg: 0.063; Tube Outside Diameter for Which Designed: 0.313 INCHES NOMINAL IN; Style Designator: INVERTED NUT, TUBE, FLARE. 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.