The Elbow,tube, cataloged under National Stock Number 4730-00-978-7953, 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 Federal Commercial Item Description Promulgated by General Services Administration Washington DC. Government technical data includes 20 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government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 | 4730-00-978-7953 |
| Primary Part Number | AS21926JB |
| Item Name | Elbow,tube |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Federal Commercial Item Description Promulgated by General Services Administration Washington DC |
| Status | ACTIVE |
| Flow Angle | 90.0 DEGREES |
| Surface Treatment Document and Classification | MIL-S-5002 MIL SPEC SINGLE TREATMENT RESPONSE INSIDE |
| Surface Treatment Document and Classification | MIL-F-14072,E300,TY2 MIL SPEC SINGLE TREATMENT RESPONSE OUTSIDE |
| Connection Style | FLARELESS (TUBE) ALL ENDS |
| Connection Type | THREADED EXTERNAL TUBE FIRST END BULKHEAD |
| Connection Type | THREADED EXTERNAL TUBE ALL ENDS |
| Nominal Outside Diameter Tube Accommodated | 0.500 INCHES ALL ENDS IN |
| Nominal Outside Diameter Tube Accommodated | 0.500 INCHES FIRST END BULKHEAD IN |
| Leg Length | 1.310 INCHES NOMINAL SECOND END IN |
| Leg Length | 1.440 INCHES NOMINAL FIRST END IN |
| Nominal Thread Size | 0.750 INCHES ALL ENDS IN |
| Nominal Thread Size | 0.750 INCHES FIRST END BULKHEAD IN |
| Seat Angle | 12.0 DEGREES ALL ENDS |
| Specification/standard Data | 96906-MS21926 GOVERNMENT STANDARD |
| Surface Treatment | PASSIVATE OVERALL |
| Thread Class | 3A FIRST END BULKHEAD A |
| Thread Class | 3A ALL ENDS A |
| Material | STEEL CORROSION RESISTING OVERALL |
| Thread Series Designator | UNF ALL ENDS |
| Thread Series Designator | UNF FIRST END BULKHEAD |
| 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 |
|---|---|
| AS21926JB | Federal Commercial Item Description Promulgated by General Services Administration Washington DC (USA) |
| Reference | Meaning |
|---|---|
| MS21926J8 | 5/9 Secondary reference U.S. Government activity |
| AS18280 | 5/9 Secondary reference U.S. Government activity |
| MS21926-8C | 5/9 Secondary reference U.S. Government activity |
| AS21926 | 5/9 Secondary reference U.S. Government activity |
| AS21926JB | 3/9 Design control — primary reference U.S. Government activity |
NSN 4730-00-978-7953 is a Elbow,tube, manufactured by Federal Commercial Item Description Promulgated by General Services Administration Washington DC, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-00-978-7953 has 1 manufacturer part number on file: AS21926JB (Federal Commercial Item Description Promulgated by General Services Administration Washington DC).
4 possible matches (shared part number, not a government interchangeability claim): 4730-01-048-3478, 4730-01-123-4999, 4730-01-467-5903. Verify interchangeability with system specifications before substitution.
Key specifications for AS21926JB: Flow Angle: 90.0 DEGREES; Surface Treatment Document and Classification: MIL-S-5002 MIL SPEC SINGLE TREATMENT RESPONSE INSIDE; Surface Treatment Document and Classification: MIL-F-14072,E300,TY2 MIL SPEC SINGLE TREATMENT RESPONSE OUTSIDE; Connection Style: FLARELESS (TUBE) ALL ENDS. 20 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.