The Elbow,tube to Boss, cataloged under National Stock Number 4730-01-540-3738, 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 Sae International Dba Sae International. 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through both NSN and commercial part number lookups. 8 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government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 | 4730-01-540-3738 |
| Primary Part Number | SAE J1453-3 521520SA |
| Item Name | Elbow,tube to Boss |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Sae International Dba Sae International |
| Status | ACTIVE |
| Flow Angle | 90.0 DEGREES |
| Connection Style | GASKET SEAL (TUBE) SECOND END |
| Connection Style | EXTERNAL SEAT FOR GASKET SEAL (BOSS) FIRST END |
| Connection Type | THREADED EXTERNAL BOSS FIRST END |
| Connection Type | THREADED EXTERNAL TUBE SECOND END |
| Nominal Outside Diameter Tube Accommodated | 0.375 INCHES SECOND END IN |
| Leg Length | 0.950 INCHES MINIMUM AND 1.010 INCHES MAXIMUM SECOND END IN |
| Leg Length | 2.580 INCHES MINIMUM AND 2.640 INCHES MAXIMUM FIRST END IN |
| Nominal Thread Size | 0.687 INCHES SECOND END IN |
| Nominal Thread Size | 0.563 INCHES FIRST END IN |
| Specification/standard Data | 81343 - J1453 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |
| Nondefinitive Spec/std Data | 29 FIGURE |
| Surface Treatment | PASSIVATE OVERALL |
| Thread Class | 2A SECOND END A |
| Thread Class | 2A FIRST END A |
| Thread Quantity Per Inch | 16 SECOND END |
| Material | STEEL CORROSION RESISTING OVERALL |
| Thread Series Designator | UN SECOND END |
| Thread Series Designator | UNF FIRST END |
| 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 |
|---|---|
| SAE J1453-3 521520SA PRIMARY | Sae International Dba Sae International (USA) |
| Reference | Meaning |
|---|---|
| SAE J1453 6-6 521520SA | 5/9 Secondary reference U.S. Government activity |
| 6-6 521520SA | 5/9 Secondary reference U.S. Government activity |
| SAE-J1453/3 | 3/1 Design control — primary reference Sae International Dba Sae International |
| SAE J1453-3 521520SA | 5/9 Secondary reference U.S. Government activity |
| SAE J1453-1 | 5/9 Secondary reference Sae International Dba Sae International |
| SAE J1453-1 | 5/9 Secondary reference U.S. Government activity |
| SAE J1453-3 | 5/9 Secondary reference U.S. Government activity |
| SAE J1453 | 5/9 Secondary reference U.S. Government activity |
NSN 4730-01-540-3738 is a Elbow,tube to Boss, manufactured by Sae International Dba Sae International, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-540-3738 has 1 manufacturer part number on file: SAE J1453-3 521520SA (Sae International Dba Sae International).
4 possible matches (shared part number, not a government interchangeability claim): 4730-01-569-3776, 4730-01-645-5750, 4730-01-645-5760. Verify interchangeability with system specifications before substitution.
Key specifications for SAE J1453-3 521520SA: Flow Angle: 90.0 DEGREES; Connection Style: GASKET SEAL (TUBE) SECOND END; Connection Style: EXTERNAL SEAT FOR GASKET SEAL (BOSS) FIRST END; Connection Type: THREADED EXTERNAL BOSS 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.