The Coupling,tube, cataloged under National Stock Number 4730-01-218-4102, 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 Senior Operations Llc Dba Metal Bellows Div Metal Bellows. Government technical data includes 10 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 4730-01-218-4102 |
| Primary Part Number | 83726 |
| Item Name | Coupling,tube |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Senior Operations Llc Dba Metal Bellows Div Metal Bellows |
| Status | ACTIVE |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Connection Style | PLAIN (TUBE) FIRST END |
| Connection Style | SHOULDERED (GASKET) (TUBE) SECOND END |
| Nominal Overall Length | 4.250 INCHES IN |
| Connection Type | UNTHREADED INTERNAL TUBE FIRST END |
| Connection Type | UNTHREADED EXTERNAL TUBE SECOND END |
| Style Designator | PLAIN |
| Material Document and Classification | AMS5510 ASSN STD SINGLE MATERIAL RESPONSE OR AMS5512 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Surface Treatment | PASSIVATE OVERALL |
| Material | STEEL COMP 321 OR STEEL COMP 347 OVERALL |
| 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 |
|---|---|
| 35050A001 | Technetics Group Daytona, Inc. (USA) |
| 83726 PRIMARY | Senior Operations Llc Dba Metal Bellows Div Metal Bellows (USA) |
| Reference | Meaning |
|---|---|
| 4730PL0743933 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| 16VP128-1 | 7/2 Vendor item drawing reference U.S. Government activity |
| 4730PL1758298 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| 83726 | 3/9 Design control — primary reference Senior Flexonics Inc |
| 4730PL1785896 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
NSN 4730-01-218-4102 is a Coupling,tube, manufactured by Senior Operations Llc Dba Metal Bellows Div Metal Bellows, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-218-4102 has 2 manufacturer part numbers on file: 35050A001 (Technetics Group Daytona, Inc.), 83726 (Senior Operations Llc Dba Metal Bellows Div Metal Bellows).
2 possible matches (shared part number, not a government interchangeability claim): 5330-01-309-1932, 4730-01-591-5704. Verify interchangeability with system specifications before substitution.
Key specifications for 83726: Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Connection Style: PLAIN (TUBE) FIRST END; Connection Style: SHOULDERED (GASKET) (TUBE) SECOND END; Nominal Overall Length: 4.250 INCHES IN. 10 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.