The Tee,tube, cataloged under National Stock Number 4730-00-939-8634, 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 17 specifications, cited from the U.S. Government catalog. The record lists 6 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 12 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-00-939-8634 |
| Primary Part Number | MS21912J4 |
| Item Name | Tee,tube |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Sae International Dba Sae International |
| Status | ACTIVE |
| Furnished Items and Quantity | 1 RESTRICTOR |
| Flow Angle | 90.0 DEGREES |
| Connection Style | FLARELESS (TUBE) ALL ENDS |
| Connection Type | THREADED EXTERNAL TUBE SECOND END BULKHEAD |
| Connection Type | THREADED EXTERNAL TUBE ALL ENDS |
| Nominal Outside Diameter Tube Accommodated | 0.250 INCHES ALL ENDS IN |
| Leg Length | 0.938 INCHES NOMINAL FIRST END IN |
| Leg Length | 0.938 INCHES NOMINAL THIRD END IN |
| Leg Length | 1.500 INCHES NOMINAL SECOND END IN |
| Nominal Thread Size | 0.438 INCHES ALL ENDS IN |
| Nominal Thread Size | 0.438 INCHES SECOND END BULKHEAD IN |
| Seat Angle | 12.0 DEGREES ALL ENDS |
| Thread Class | 3A SECOND END BULKHEAD A |
| Thread Class | 3A ALL ENDS A |
| Material | STEEL COMP 304 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) SECOND END BULKHEAD |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) ALL ENDS |
| 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 |
|---|---|
| MS21912J4 | Lockheed Martin Corporation Div Rotary and Mission Systems (USA) |
| MS21912J4 | Wesco Aircraft Hardware Corp. Dba Incora (USA) |
| MS21912J4 | Designed Metal Connections Inc Dba Permaswage Usa Div Permaswage, a Pcc Company (USA) |
| MS21912J4 | B. & E. Manufacturing Co., Inc. Dba B & E Manufacturing Co Inc (USA) |
| MS21912J4 | Hydro-Fitting Manufacturing Corporation (USA) |
| MS21912J4 PRIMARY | Sae International Dba Sae International (USA) |
| Reference | Meaning |
|---|---|
| JSFA1691204JS | 5/9 Secondary reference U.S. Government activity |
| SS49MC912-4J16S | 5/9 Secondary reference Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp |
| SS49 | 5/9 Secondary reference Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp |
| AS21912 | 5/9 Secondary reference U.S. Government activity |
| MS21912J4 | 5/9 Secondary reference U.S. Government activity |
| AS18280 | 5/9 Secondary reference U.S. Government activity |
| SS49MC912-4C16S | 5/9 Secondary reference Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp |
| SS49MC912C4-16S | 5/9 Secondary reference Airbus Deutschland Gmbh -Werk Bremen- |
| SS49MC912C4-16S | 5/9 Secondary reference Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp |
| SAE-AS18280 | 3/1 Design control — primary reference Sae International Dba Sae International |
| AS18280 | 5/9 Secondary reference Sae International Dba Sae International |
| AS21912 | 5/9 Secondary reference Sae International Dba Sae International |
NSN 4730-00-939-8634 is a Tee,tube, manufactured by Sae International Dba Sae International, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-00-939-8634 has 6 manufacturer part numbers on file: MS21912J4 (Lockheed Martin Corporation Div Rotary and Mission Systems), MS21912J4 (Wesco Aircraft Hardware Corp. Dba Incora), MS21912J4 (Designed Metal Connections Inc Dba Permaswage Usa Div Permaswage, a Pcc Company), MS21912J4 (B. & E. Manufacturing Co., Inc. Dba B & E Manufacturing Co Inc), MS21912J4 (Hydro-Fitting Manufacturing Corporation) and 1 more.
Key specifications for MS21912J4: Furnished Items and Quantity: 1 RESTRICTOR; Flow Angle: 90.0 DEGREES; Connection Style: FLARELESS (TUBE) ALL ENDS; Connection Type: THREADED EXTERNAL TUBE SECOND END BULKHEAD. 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.