The Union,pipe to Tube, cataloged under National Stock Number 4730-00-151-6837, is classified within Federal Supply Class 4730 (Hose, Pipe, Tube, Lubrication, and Railing Fittings) of the Pipe, Tubing, Hose, and Fittings group. Government technical data includes 17 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4730-00-151-6837 |
| Item Name | Union,pipe to Tube |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Status | ACTIVE |
| Connection Style | PLAIN (TUBE) FIRST END |
| Connection Style | PLAIN (PIPE) SECOND END |
| Coupling Flange Shape | HEXAGON |
| Tubing Wall Nominal Thickness for Which Designed | 0.035 INCHES FIRST END IN |
| Nominal Overall Length | 1.812 INCHES IN |
| Style Designator | SCREWED |
| Material Document and Classification | ASTMB62 ASSN STD 1ST MATERIAL RESPONSE NUT |
| Material Document and Classification | ASTMB62 ASSN STD 2ND MATERIAL RESPONSE TAILPIECE |
| Material Document and Classification | ASTMB75 ASSN STD 3RD MATERIAL RESPONSE THREAD PIECE |
| Nominal Outside Diameter Tube Accommodated | 0.379 INCHES FIRST END IN |
| Seat Type | BEVELED |
| Nominal Thread Size | 0.250 INCHES SECOND END IN |
| Material | COPPER ALLOY TAILPIECE |
| Material | COPPER ALLOY 836 NUT |
| Material | COPPER ALLOY 836 THREAD PIECE |
| Thread Series Designator | NPT SECOND END |
| 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 |
| Reference | Meaning |
|---|---|
| 733-4 1-4 | 3/9 Design control — primary reference Nibco Inc |
| 1733-4 1-4 | 5/9 Secondary reference Arco Metals Co Div of Atlantic Richfield Co |
| 11241583-2 | 5/9 Secondary reference Ballistic Missile Defense Systems Command |
NSN 4730-00-151-6837 is a Union,pipe to Tube, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 5995-01-606-6735. Verify interchangeability with system specifications before substitution.
Key specifications for 4730-00-151-6837: Connection Style: PLAIN (TUBE) FIRST END; Connection Style: PLAIN (PIPE) SECOND END; Coupling Flange Shape: HEXAGON; Tubing Wall Nominal Thickness for Which Designed: 0.035 INCHES FIRST END IN. 17 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.