The Nut,tube Coupling, cataloged under National Stock Number 4730-00-994-8567, 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 Lesman Instrument 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-00-994-8567 |
| Primary Part Number | 761FB-1/4 |
| Item Name | Nut,tube Coupling |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Lesman Instrument Co |
| Status | ACTIVE |
| Length to Shoulder | 0.250 INCHES MINIMUM AND 0.281 INCHES MAXIMUM IN |
| Width Across Flats | 0.615 INCHES MINIMUM AND 0.635 INCHES MAXIMUM IN |
| Thread Series | UNF |
| Material Document and Classification | QQ-B-626,COMP 22,1/2 H FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.500 INCHES IN |
| Nut Height | 0.584 INCHES MINIMUM AND 0.609 INCHES MAXIMUM IN |
| Nut Style | TUBE COUPLING |
| Thread Class | 2B |
| Thread Quantity Per Inch | 20 |
| Material | COPPER ALLOY 360 OR COPPER ALLOY OVERALL |
| Fabrication Method | MACHINED |
| Smallest Inside Diameter | 0.250 INCHES MINIMUM AND 0.266 INCHES MAXIMUM IN |
| Nominal Tube Outside Diameter | 0.258 INCHES 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 |
|---|---|
| 761FB-1/4 PRIMARY | Lesman Instrument Co (USA) |
| Reference | Meaning |
|---|---|
| 761FB 1-4IN | 5/9 Secondary reference Imperial |
| 761FB | 5/9 Secondary reference Imperial |
NSN 4730-00-994-8567 is a Nut,tube Coupling, manufactured by Lesman Instrument Co, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-00-994-8567 has 1 manufacturer part number on file: 761FB-1/4 (Lesman Instrument Co).
3 possible matches (shared part number, not a government interchangeability claim): 4730-00-994-8569, 4730-00-994-8570, 4730-00-994-8571. Verify interchangeability with system specifications before substitution.
Key specifications for 761FB-1/4: Length to Shoulder: 0.250 INCHES MINIMUM AND 0.281 INCHES MAXIMUM IN; Width Across Flats: 0.615 INCHES MINIMUM AND 0.635 INCHES MAXIMUM IN; Thread Series: UNF; Material Document and Classification: QQ-B-626,COMP 22,1/2 H FED 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.