The Boss,fill and Vent, cataloged under National Stock Number 4730-01-021-7903, 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 Northrop Grumman Support Services Corp. Government technical data includes 1 specification, 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-021-7903 |
| Primary Part Number | 605B578H01 |
| Item Name | Boss,fill and Vent |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Northrop Grumman Support Services Corp |
| Status | ACTIVE |
| General Characteristics Item Description | STEEL,QQ-S-763,CL303,COND A,PASSIVATED PER 133C133,PARA D,ONE END UNTHD,1.005 IN. ID,1.095 IN. OD,OTHER END INT THD BOSS,0.750-16NF-3B,COUNTERBORE 0.769 IN. DIA,0.094 IN. DP COUNTERSINK 120 DEG TO 0.875 IN. DIA,EXT THD,1.250-12 UNF-2A,UNDERCUT 0.125 IN. W TO 1.130 IN. DIA,0.250 IN. W OF FLANGE,1.500 IN. HEX,1.000 IN. LG O/A,4 HOLES 0.094 IN. DIA A |
| 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 |
|---|---|
| 605B578H01 PRIMARY | Northrop Grumman Support Services Corp (USA) |
| Reference | Meaning |
|---|---|
| 605B578H01 | 3/9 Design control — primary reference U.S. Government activity |
NSN 4730-01-021-7903 is a Boss,fill and Vent, manufactured by Northrop Grumman Support Services Corp, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-021-7903 has 1 manufacturer part number on file: 605B578H01 (Northrop Grumman Support Services Corp).
Key specifications for 605B578H01: General Characteristics Item Description: STEEL,QQ-S-763,CL303,COND A,PASSIVATED PER 133C133,PARA D,ONE END UNTHD,1.005 IN. ID,1.095 IN. OD,OTHER END INT THD BOSS,0.750-16NF-3B,COUNTERBORE 0.769 IN. DIA,0.094 IN. DP COUNTERSINK 120 DEG TO 0.875 IN. DIA,EXT THD,1.250-12 UNF-2A,UNDERCUT 0.125 IN. W TO 1.130 IN. DIA,0.250 IN. W OF FLANGE,1.500 IN. HEX,1.000 IN. LG O/A,4 HOLES 0.094 IN. DIA A; End Item Identification: RADAR SET TYPE NO.AN/TPS43. 1 specification is 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.