The Locknut,tube Fitting, cataloged under National Stock Number 4730-01-196-7432, 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 13 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through both NSN and commercial part number lookups. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 4730-01-196-7432 |
| Primary Part Number | NK0670-1 |
| Item Name | Locknut,tube Fitting |
| 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 | 2.500 INCHES NOMINAL IN |
| Packing Recess Diameter | 2.125 INCHES NOMINAL IN |
| Thread Series | UN |
| Material Document and Classification | MIL-M-16576 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 1.875 INCHES IN |
| Nut Height | 0.562 INCHES NOMINAL IN |
| Nut Style | TUBE FITTING LOCKNUT |
| Thread Class | 2B |
| Thread Quantity Per Inch | 12 |
| Material | COPPER ALLOY 903 OVERALL |
| Nominal Tube Outside Diameter | 1.500 INCHES IN |
| Packing Recess Depth | 0.188 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 |
|---|---|
| NK0670-1 PRIMARY | Curtiss-Wright Electro-Mechanical Corporation Dba Curtiss-Wright Steam and Air Solutions Div Steam and Air Solutions (USA) |
| Reference | Meaning |
|---|---|
| S-920 | D/9 Drawing number reference only U.S. Government activity |
| S-203 | D/9 Drawing number reference only U.S. Government activity |
| NK0670-1 | 5/9 Secondary reference U.S. Government activity |
| NK0670-1 | 3/9 Design control — primary reference Siemens Government Technologies, Inc. Dba Sgt Dresser-Rand Div Sgt Dresser-Rand |
| S203PC11 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| S-920 PIECE 4 | 5/9 Secondary reference U.S. Government activity |
| S-203-11 | 5/9 Secondary reference U.S. Government activity |
NSN 4730-01-196-7432 is a Locknut,tube Fitting, 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 4730-01-196-7432 has 1 manufacturer part number on file: NK0670-1 (Curtiss-Wright Electro-Mechanical Corporation Dba Curtiss-Wright Steam and Air Solutions Div Steam and Air Solutions).
2 possible matches (shared part number, not a government interchangeability claim): 5340-01-355-4820, 4910-01-699-9835. Verify interchangeability with system specifications before substitution.
Key specifications for NK0670-1: Width Across Flats: 2.500 INCHES NOMINAL IN; Packing Recess Diameter: 2.125 INCHES NOMINAL IN; Thread Series: UN; Material Document and Classification: MIL-M-16576 MIL 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.