The Adapter,straight,flange to Tube, cataloged under National Stock Number 4730-01-351-1583, 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 R. Kern Engineering & Manufacturing Corp. Dba R Kern Engineering & Manufacturing Corp. Government technical data includes 19 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-351-1583 |
| Primary Part Number | CTO1681-105FG |
| Item Name | Adapter,straight,flange to Tube |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | R. Kern Engineering & Manufacturing Corp. Dba R Kern Engineering & Manufacturing Corp |
| Status | ACTIVE |
| Flange Shape | ROUND SECOND END |
| Flange Face Design | PLAIN SECOND END |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Connection Style | PLAIN (TUBE) FIRST END |
| Nominal Overall Length | 0.940 INCHES IN |
| Connection Type | FLANGE SECOND END |
| Connection Type | THREADED EXTERNAL TUBE FIRST END |
| Material Document and Classification | QQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Outside Diameter Tube Accommodated | 0.750 INCHES FIRST END IN |
| Nominal Thread Size | 1.000 INCHES FIRST END IN |
| Nominal Thread Size | 1.125 INCHES FIRST END BULKHEAD IN |
| Nominal Outside Diameter | 1.620 INCHES SECOND END IN |
| Surface Treatment | PASSIVATE OVERALL |
| Thread Class | 2A FIRST END A |
| Thread Class | 2A FIRST END BULKHEAD A |
| Material | STEEL CORROSION RESISTING OVERALL |
| Thread Series Designator | UNEF FIRST END |
| Thread Series Designator | UNEF FIRST END BULKHEAD |
| Nominal Thickness | 0.125 INCHES SECOND END 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 |
|---|---|
| CTO1681-105FG PRIMARY | R. Kern Engineering & Manufacturing Corp. Dba R Kern Engineering & Manufacturing Corp (USA) |
NSN 4730-01-351-1583 is a Adapter,straight,flange to Tube, manufactured by R. Kern Engineering & Manufacturing Corp. Dba R Kern Engineering & Manufacturing Corp, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-351-1583 has 1 manufacturer part number on file: CTO1681-105FG (R. Kern Engineering & Manufacturing Corp. Dba R Kern Engineering & Manufacturing Corp).
Key specifications for CTO1681-105FG: Flange Shape: ROUND SECOND END; Flange Face Design: PLAIN SECOND END; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Connection Style: PLAIN (TUBE) FIRST END. 19 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.