The Reducer,boss, cataloged under National Stock Number 4730-00-978-6985, 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 16 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through both NSN and commercial part number lookups. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-00-978-6985 |
| Primary Part Number | MS21916J16-4 |
| 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 | EXTERNAL SEAT FOR GASKET SEAL (BOSS) ALL ENDS |
| Nominal Overall Length | 1.531 INCHES IN |
| Connection Type | THREADED EXTERNAL BOSS ALL ENDS |
| Material Document and Classification | 66 FED STD SINGLE MATERIAL RESPONSE OVERALL |
| Operating Pressure | 1500.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Nominal Thread Size | 1.312 INCHES FIRST END IN |
| Nominal Thread Size | 0.438 INCHES SECOND END IN |
| Specification/standard Data | AS21916 PROFESSIONAL/INDUSTRIAL ASSOCIATION SPECIFICATION |
| Surface Treatment | PASSIVATE OVERALL |
| Media for Which Designed | AERONAUTICAL FLUID SINGLE RESPONSE |
| Thread Class | 3A ALL ENDS A |
| Thread Quantity Per Inch | 12 FIRST END |
| Material | STEEL COMP 304 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) SECOND END |
| Thread Series Designator | UNIFIED NATIONAL JOINT (UNJ) FIRST 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 |
|---|---|
| MS21916J16-4 PRIMARY | Sae International Dba Sae International (USA) |
| Reference | Meaning |
|---|---|
| MS21916J16-4 | 5/9 Secondary reference Designed Metal Connections Inc Dba Permaswage Usa Div Permaswage, a Pcc Company |
| MS21916J16-4 | 5/9 Secondary reference U.S. Government activity |
| AS18280 | 5/9 Secondary reference U.S. Government activity |
| MS21916J16-4 | 5/1 Secondary reference Eaton Aeroquip Llc Dba Jackson North 1 Div Fluid and Electrical Distribution |
| MS21916J16-4 | 5/9 Secondary reference U.S. Government activity |
| AS18280 | 5/9 Secondary reference Sae International Dba Sae International |
| SAE-AS18280 | 3/1 Design control — primary reference Sae International Dba Sae International |
NSN 4730-00-978-6985 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 4730-00-978-6985 has 1 manufacturer part number on file: MS21916J16-4 (Sae International Dba Sae International).
Key specifications for MS21916J16-4: Connection Style: EXTERNAL SEAT FOR GASKET SEAL (BOSS) ALL ENDS; Nominal Overall Length: 1.531 INCHES IN; Connection Type: THREADED EXTERNAL BOSS ALL ENDS; Material Document and Classification: 66 FED STD SINGLE MATERIAL RESPONSE OVERALL. 16 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.