The Elbow,boss, cataloged under National Stock Number 4730-00-278-9307, 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 14 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through both NSN and commercial part number lookups. 16 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 5 items share a part number with this NSN in the catalog (possible match — not a government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 | 4730-00-278-9307 |
| Primary Part Number | AS5191-06 |
| Item Name | Elbow,boss |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Sae International Dba Sae International |
| Status | ACTIVE |
| Flow Angle | 45.0 DEGREES |
| Surface Treatment Document and Classification | QQ-P-416,TY 1 OR TY 2,CL 2 MIL SPEC 1ST TREATMENT RESPONSE OVERALL |
| Connection Style | GASKET SEAL (BOSS) ALL ENDS |
| Connection Type | THREADED INTERNAL BOSS ALL ENDS |
| Material Document and Classification | 66,AISI/SAE 4140 FED STD 1ST MATERIAL RESPONSE OR 66,AISI/SAE 4130 FED STD 2ND MATERIAL RESPONSE OVERALL |
| Leg Length | 0.656 INCHES MINIMUM AND 0.734 INCHES MAXIMUM FIRST END IN |
| Leg Length | 0.656 INCHES MINIMUM SECOND END IN |
| Nominal Thread Size | 0.562 INCHES FIRST END IN |
| Maximum Operating Temp | 225.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Surface Treatment | CADMIUM OR OXIDE OVERALL |
| Media for Which Designed | HYDRAULIC FLUID SINGLE RESPONSE |
| Thread Class | 3B ALL ENDS |
| Material | STEEL COMP 4140 OR STEEL COMP 4130 OVERALL |
| Thread Series Designator | UNF 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 |
|---|---|
| AS5191-06 PRIMARY | Sae International Dba Sae International (USA) |
| Reference | Meaning |
|---|---|
| AS5191 | 5/9 Secondary reference U.S. Government activity |
| AN941-6 | 5/9 Secondary reference Aerofit, Llc |
| AN941-6 | 5/9 Secondary reference Allan Aircraft Supply Co., Llc Dba Allan Aircraft Supply |
| AS5191-06 | 3/9 Design control — primary reference U.S. Government activity |
| AS4875 | 5/9 Secondary reference U.S. Government activity |
| AS4875 | 5/1 Secondary reference Sae International Dba Sae International |
| AN941-6 | 5/9 Secondary reference Collins Engineering Corp |
| AN928-6 | 5/9 Secondary reference U.S. Government activity |
| AN941-6 | 5/9 Secondary reference U.S. Government activity |
| SAE-AS4875 | 3/1 Design control — primary reference Sae International Dba Sae International |
| AS5191 | 5/1 Secondary reference Sae International Dba Sae International |
| AN941-6 | 5/9 Secondary reference Designed Metal Connections Inc Dba Permaswage Usa Div Permaswage, a Pcc Company |
| AN941-6 | 5/9 Secondary reference Hydro-Fitting Manufacturing Corporation |
| AN941-6 | 5/9 Secondary reference Eaton Aeroquip Llc Dba Jackson North 1 Div Fluid and Electrical Distribution |
| AN941-6 | 5/9 Secondary reference Faber Enterprises, Inc. Div Faber Enterprise Inc |
| AN941-6 | 5/9 Secondary reference Crown Fitting Co Inc |
NSN 4730-00-278-9307 is a Elbow,boss, manufactured by Sae International Dba Sae International, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-00-278-9307 has 1 manufacturer part number on file: AS5191-06 (Sae International Dba Sae International).
5 possible matches (shared part number, not a government interchangeability claim): 4730-00-278-9310, 4730-00-278-9316, 4730-00-409-0774. Verify interchangeability with system specifications before substitution.
Key specifications for AS5191-06: Flow Angle: 45.0 DEGREES; Surface Treatment Document and Classification: QQ-P-416,TY 1 OR TY 2,CL 2 MIL SPEC 1ST TREATMENT RESPONSE OVERALL; Connection Style: GASKET SEAL (BOSS) ALL ENDS; Connection Type: THREADED INTERNAL BOSS ALL ENDS. 14 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.