The Union,tube, cataloged under National Stock Number 4730-00-203-7490, 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 18 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-00-203-7490 |
| Primary Part Number | MS21902-2 |
| Item Name | Union,tube |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Sae International Dba Sae International |
| Status | ACTIVE |
| Surface Treatment Document and Classification | QQ-P-416,TY 2,CL 1 FED SPEC 1ST TREATMENT RESPONSE OVERALL |
| Connection Style | EXTERNAL SEAT FOR GASKET SEAL (BOSS) ALL ENDS |
| Nominal Overall Length | 1.062 INCHES IN |
| Connection Type | THREADED EXTERNAL BOSS ALL ENDS |
| Style Designator | FLARELESS W/ CENTER WRENCHING FACILITY |
| Material Document and Classification | 66,AISI/SAE 1137 OR 1141 FED STD SINGLE MATERIAL RESPONSE OVERALL |
| Reduced Passage Nominal Inside Diameter | 0.062 INCHES ALL ENDS IN |
| Nominal Thread Size | 0.312 INCHES ALL ENDS IN |
| Specification/standard Data | 96906-MS21902 GOVERNMENT STANDARD |
| Maximum Operating Temp | 225.0 FAHRENHEIT FIRST RESPONSE DEGF |
| Maximum Operating Temp | -65.0 FAHRENHEIT SECOND RESPONSE DEGF |
| Surface Treatment | CADMIUM AND CHROMATE OVERALL |
| Media for Which Designed | OXYGEN, GASEOUS THIRD RESPONSE |
| Media for Which Designed | AIR SECOND RESPONSE |
| Media for Which Designed | HYDRAULIC FLUID FIRST RESPONSE |
| Thread Class | 3A ALL ENDS A |
| Material | STEEL COMP 1137 OR STEEL COMP 1141 OVERALL |
| 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 |
|---|---|
| MS21902-2 PRIMARY | Sae International Dba Sae International (USA) |
| Reference | Meaning |
|---|---|
| MS21902-2 | 5/9 Secondary reference Eaton Aeroquip Llc Dba Jackson North 1 Div Fluid and Electrical Distribution |
| MS21902-2 | 5/1 Secondary reference Danfoss Power Solutions II, Llc |
| SAE-AS18280 | 3/1 Design control — primary reference Sae International Dba Sae International |
| MS21902-2 | 5/9 Secondary reference U.S. Government activity |
NSN 4730-00-203-7490 is a Union,tube, manufactured by Sae International Dba Sae International, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-00-203-7490 has 1 manufacturer part number on file: MS21902-2 (Sae International Dba Sae International).
Key specifications for MS21902-2: Surface Treatment Document and Classification: QQ-P-416,TY 2,CL 1 FED SPEC 1ST TREATMENT RESPONSE OVERALL; Connection Style: EXTERNAL SEAT FOR GASKET SEAL (BOSS) ALL ENDS; Nominal Overall Length: 1.062 INCHES IN; Connection Type: THREADED EXTERNAL BOSS ALL ENDS. 18 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.