The Locknut,pipe, cataloged under National Stock Number 4730-00-277-7874, 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 Mcmaster-Carr Supply Co. Government technical data includes 11 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-00-277-7874 |
| Primary Part Number | 4429K123 |
| Item Name | Locknut,pipe |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Mcmaster-Carr Supply Co |
| Status | ACTIVE |
| Width Across Flats | 1.000 INCHES NOMINAL IN |
| Packing Recess Diameter | 0.875 INCHES NOMINAL IN |
| Thread Series | NPSL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.375 INCHES IN |
| Nut Height | 0.250 INCHES NOMINAL IN |
| Nut Style | PIPE LOCKNUT |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 18 |
| Material | COPPER ALLOY OVERALL |
| Packing Recess Depth | 0.0625 INCHES NOMINAL 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 |
|---|---|
| 4429K123 PRIMARY | Mcmaster-Carr Supply Co (USA) |
| 1231 3/8 PRIMARY | Westchester Square Plumbing Supply Company Inc (USA) |
| Reference | Meaning |
|---|---|
| 1231-3/8 | 5/9 Secondary reference U.S. Government activity |
| 1231 | 5/9 Secondary reference U.S. Government activity |
NSN 4730-00-277-7874 is a Locknut,pipe, manufactured by Mcmaster-Carr Supply Co, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-00-277-7874 has 2 manufacturer part numbers on file: 4429K123 (Mcmaster-Carr Supply Co), 1231 3/8 (Westchester Square Plumbing Supply Company Inc).
Key specifications for 4429K123: Width Across Flats: 1.000 INCHES NOMINAL IN; Packing Recess Diameter: 0.875 INCHES NOMINAL IN; Thread Series: NPSL; Thread Direction: RIGHT-HAND. 11 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.