The Packing Nut, cataloged under National Stock Number 4730-00-936-8739, 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 Curtiss-Wright Electro-Mechanical Corporation Dba Curtiss-Wright Steam and Air Solutions Div Steam and Air Solutions. Government technical data includes 11 specifications, cited from the U.S. Government catalog. The record lists 3 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through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 4730-00-936-8739 |
| Primary Part Number | 3241B |
| Item Name | Packing Nut |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Curtiss-Wright Electro-Mechanical Corporation Dba Curtiss-Wright Steam and Air Solutions Div Steam and Air Solutions |
| Status | ACTIVE |
| Width Across Flats | 1.513 INCHES NOMINAL IN |
| Thread Length | 0.450 INCHES NOMINAL IN |
| Style Designator | HEXAGON, EXTERNAL THREAD, BOSS |
| Thread Direction | RIGHT-HAND |
| Casehardening Indicator | NOT CASEHARDENED |
| Thread Size | 1-3/8-12 |
| Screw Thread Series Designator | UNF |
| Thread Class | 2A A |
| Screw Thread Location | EXTERNAL |
| Material | COPPER ALLOY |
| Smallest Inside Diameter | 1.030 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 |
|---|---|
| 3241B PRIMARY | Curtiss-Wright Electro-Mechanical Corporation Dba Curtiss-Wright Steam and Air Solutions Div Steam and Air Solutions (USA) |
| 156425PC503 | Curtiss-Wright Electro-Mechanical Corporation Dba Curtiss-Wright Steam and Air Solutions Div Steam and Air Solutions (USA) |
| SMS-3241B PRIMARY | Salem Manufacturing & Sales Inc Div Salem Manufacturing and Sales Inc (USA) |
| Reference | Meaning |
|---|---|
| 3241B | 5/9 Secondary reference U.S. Government activity |
| 156425PC503 | 5/9 Secondary reference Siemens Energy, Inc. Dba Dresser-Rand |
| 156425PC503 | 5/9 Secondary reference U.S. Government activity |
| 156425PC503 | 5/9 Secondary reference U.S. Government activity |
| 3241B | 5/9 Secondary reference U.S. Government activity |
| 3241B | 5/9 Secondary reference Siemens Energy, Inc. Dba Dresser-Rand |
NSN 4730-00-936-8739 is a Packing Nut, manufactured by Curtiss-Wright Electro-Mechanical Corporation Dba Curtiss-Wright Steam and Air Solutions Div Steam and Air Solutions, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-00-936-8739 has 3 manufacturer part numbers on file: 3241B (Curtiss-Wright Electro-Mechanical Corporation Dba Curtiss-Wright Steam and Air Solutions Div Steam and Air Solutions), 156425PC503 (Curtiss-Wright Electro-Mechanical Corporation Dba Curtiss-Wright Steam and Air Solutions Div Steam and Air Solutions), SMS-3241B (Salem Manufacturing & Sales Inc Div Salem Manufacturing and Sales Inc).
Key specifications for 3241B: Width Across Flats: 1.513 INCHES NOMINAL IN; Thread Length: 0.450 INCHES NOMINAL IN; Style Designator: HEXAGON, EXTERNAL THREAD, BOSS; Overall Length: 0.995 INCHES NOMINAL IN. 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.