The Tee,tube to Boss, cataloged under National Stock Number 4730-01-558-9653, 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 21 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through both NSN and commercial part number lookups. 8 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-558-9653 |
| Primary Part Number | MS21911W5 |
| Item Name | Tee,tube to Boss |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Sae International Dba Sae International |
| Status | ACTIVE |
| Connection Style | GASKET SEAL (BOSS) FIRST END |
| Connection Style | FLARELESS (TUBE) THIRD END |
| Connection Style | FLARELESS (TUBE) SECOND END |
| Connection Type | THREADED EXTERNAL TUBE THIRD END |
| Connection Type | THREADED INTERNAL BOSS FIRST END |
| Connection Type | THREADED EXTERNAL TUBE SECOND END |
| Nominal Outside Diameter Tube Accommodated | 0.312 INCHES FIRST END IN |
| Leg Length | 0.750 INCHES NOMINAL FIRST END IN |
| Leg Length | 0.438 INCHES NOMINAL THIRD END IN |
| Leg Length | 1.672 INCHES NOMINAL SECOND END IN |
| Nominal Thread Size | 0.500 INCHES SECOND END IN |
| Nominal Thread Size | 0.500 INCHES THIRD END IN |
| Nominal Thread Size | 0.500 INCHES FIRST END IN |
| Seat Angle | 24.0 DEGREES FIRST END |
| Thread Class | 3A FIRST END A |
| Thread Class | 3A SECOND END A |
| Thread Class | 34 THIRD END |
| Material | ALUMINUM ALLOY OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) FIRST END |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) THIRD END |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) SECOND 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 |
|---|---|
| MS21911W5 PRIMARY | Sae International Dba Sae International (USA) |
| Reference | Meaning |
|---|---|
| AS21911 | 5/9 Secondary reference Sae International Dba Sae International |
| AS21911 | 5/9 Secondary reference U.S. Government activity |
| MS21911W5 | 5/9 Secondary reference U.S. Government activity |
| SAE-AS18280 | 3/1 Design control — primary reference Sae International Dba Sae International |
| MS21911 | 5/9 Secondary reference U.S. Government activity |
| AS18280 | 5/9 Secondary reference Sae International Dba Sae International |
| AS18280 | 5/9 Secondary reference U.S. Government activity |
| MS21911W5 | 5/9 Secondary reference U.S. Government activity |
NSN 4730-01-558-9653 is a Tee,tube to Boss, manufactured by Sae International Dba Sae International, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-558-9653 has 1 manufacturer part number on file: MS21911W5 (Sae International Dba Sae International).
Key specifications for MS21911W5: Connection Style: GASKET SEAL (BOSS) FIRST END; Connection Style: FLARELESS (TUBE) THIRD END; Connection Style: FLARELESS (TUBE) SECOND END; Connection Type: THREADED EXTERNAL TUBE THIRD END. 21 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.