The Union,pipe, cataloged under National Stock Number 4730-01-018-0517, 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 Tube Turns Technologies Inc. Government technical data includes 11 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. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-018-0517 |
| Primary Part Number | 159-6IN |
| Item Name | Union,pipe |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Tube Turns Technologies Inc |
| Status | ACTIVE |
| Nominal Pipe Size Accommodated | 6.000 INCHES ALL ENDS IN |
| Connection Style | SOCKET (PIPE) ALL ENDS |
| Coupling Flange Shape | ROUND |
| Nominal Overall Length | 12.500 INCHES IN |
| Connection Type | UNTHREADED INTERNAL PIPE ALL ENDS |
| Style Designator | FLANGED |
| Operating Pressure | 300.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Seat Type | GROOVED |
| Media for Which Designed | STEAM SINGLE RESPONSE |
| Material | STEEL OVERALL |
| Reducer Type | CONCENTRIC |
| 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 |
|---|---|
| 159-6IN PRIMARY | Tube Turns Technologies Inc (USA) |
NSN 4730-01-018-0517 is a Union,pipe, manufactured by Tube Turns Technologies Inc, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-018-0517 has 1 manufacturer part number on file: 159-6IN (Tube Turns Technologies Inc).
1 possible match (shared part number, not a government interchangeability claim): 6350-01-251-1543. Verify interchangeability with system specifications before substitution.
Key specifications for 159-6IN: Nominal Pipe Size Accommodated: 6.000 INCHES ALL ENDS IN; Connection Style: SOCKET (PIPE) ALL ENDS; Coupling Flange Shape: ROUND; Nominal Overall Length: 12.500 INCHES 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.