The Locknut,tube Fitting, cataloged under National Stock Number 4730-00-659-8976, is classified within Federal Supply Class 4730 (Hose, Pipe, Tube, Lubrication, and Railing Fittings) of the Pipe, Tubing, Hose, and Fittings group. Government technical data includes 13 specifications, cited from the U.S. Government catalog. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-00-659-8976 |
| Item Name | Locknut,tube Fitting |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Status | ACTIVE |
| Width Across Flats | 0.996 INCHES MINIMUM AND 1.003 INCHES MAXIMUM IN |
| Packing Recess Diameter | 0.915 INCHES MINIMUM AND 0.925 INCHES MAXIMUM IN |
| Thread Series | UNF |
| Material Document and Classification | QQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.750 INCHES IN |
| Nut Height | 0.328 INCHES MINIMUM AND 0.360 INCHES MAXIMUM IN |
| Nut Style | TUBE FITTING LOCKNUT |
| Thread Class | 3B |
| Thread Quantity Per Inch | 16 |
| Material | STEEL COMP 304 OVERALL |
| Nominal Tube Outside Diameter | 0.500 INCHES IN |
| Packing Recess Depth | 0.037 INCHES MINIMUM AND 0.047 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 |
| Reference | Meaning |
|---|---|
| BACN10DU8C | 5/9 Secondary reference U.S. Government activity |
| BACN10DU8J | 5/2 Secondary reference U.S. Government activity |
| BACN10DU | D/9 Drawing number reference only U.S. Government activity |
| AS4841 | 5/9 Secondary reference U.S. Government activity |
| BACN10DU8J | 3/2 Design control — primary reference U.S. Government activity |
| AS4841 | 3/1 Design control — primary reference Sae International Dba Sae International |
NSN 4730-00-659-8976 is a Locknut,tube Fitting, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 4730-01-192-9551. Verify interchangeability with system specifications before substitution.
Key specifications for 4730-00-659-8976: Width Across Flats: 0.996 INCHES MINIMUM AND 1.003 INCHES MAXIMUM IN; Packing Recess Diameter: 0.915 INCHES MINIMUM AND 0.925 INCHES MAXIMUM IN; Thread Series: UNF; Material Document and Classification: QQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE OVERALL. 13 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.