The Reducer,boss, cataloged under National Stock Number 4730-00-187-3591, 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 13 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 17 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4730-00-187-3591 |
| Primary Part Number | AS5174D1206 |
| Item Name | Reducer,boss |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Sae International Dba Sae International |
| Status | ACTIVE |
| Connection Style | FLARED W/ GASKET SEAL (BOSS) ALL ENDS |
| Nominal Overall Length | 1.797 INCHES IN |
| Connection Type | THREADED EXTERNAL BOSS ALL ENDS |
| Material Document and Classification | QQ-A-225/4,T6 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Size | 0.562 INCHES SECOND END IN |
| Nominal Thread Size | 1.062 INCHES FIRST END IN |
| Surface Treatment | ANODIZE OVERALL |
| Thread Class | 3A ALL ENDS A |
| Thread Quantity Per Inch | 12 FIRST END |
| Material | ALUMINUM ALLOY 2014 OVERALL |
| Thread Series Designator | UN FIRST END |
| Thread Series Designator | UNF 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 |
| Part Number | Manufacturer |
|---|---|
| AN919-18D | Satair A/s (DNK) |
| AS5174D1206 PRIMARY | Sae International Dba Sae International (USA) |
| Reference | Meaning |
|---|---|
| AN919-18D | 5/9 Secondary reference Designed Metal Connections Inc Dba Permaswage Usa Div Permaswage, a Pcc Company |
| Z00.N7730063287 | 5/9 Secondary reference Daher Aerospace - Ex Socata |
| AN919-18D | 5/9 Secondary reference Hydro-Fitting Manufacturing Corporation |
| AN919-18D | 5/9 Secondary reference Crown Fitting Co Inc |
| AN919-18D | 5/9 Secondary reference U.S. Government activity |
| 273-0089-019 | 5/1 Secondary reference U.S. Government activity |
| AN919-18D | 5/9 Secondary reference Faber Enterprises, Inc. Div Faber Enterprise Inc |
| AS5174D1206 | 5/9 Secondary reference U.S. Government activity |
| AN919-18D | 5/9 Secondary reference Allan Aircraft Supply Co., Llc Dba Allan Aircraft Supply |
| AN919-18D | 5/9 Secondary reference Eaton Aeroquip Llc Dba Jackson North 1 Div Fluid and Electrical Distribution |
| AS5174 | 5/9 Secondary reference U.S. Government activity |
| AS5174 | 5/9 Secondary reference Sae International Dba Sae International |
| AS4841 | 5/9 Secondary reference Sae International Dba Sae International |
| AS4841 | 5/9 Secondary reference U.S. Government activity |
| SAE-AS4841 | 3/1 Design control — primary reference Sae International Dba Sae International |
| AN919-18D | 5/9 Secondary reference Collins Engineering Corp |
| 991918 | C/1 Advisory reference — outside the item-of-supply concept Earls Supply Co |
NSN 4730-00-187-3591 is a Reducer,boss, manufactured by Sae International Dba Sae International, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-00-187-3591 has 2 manufacturer part numbers on file: AN919-18D (Satair A/s), AS5174D1206 (Sae International Dba Sae International).
1 possible match (shared part number, not a government interchangeability claim): 4730-00-684-7159. Verify interchangeability with system specifications before substitution.
Key specifications for AS5174D1206: Connection Style: FLARED W/ GASKET SEAL (BOSS) ALL ENDS; Nominal Overall Length: 1.797 INCHES IN; Connection Type: THREADED EXTERNAL BOSS ALL ENDS; Material Document and Classification: QQ-A-225/4,T6 FED SPEC SINGLE MATERIAL RESPONSE OVERALL. 13 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.