The Cap,tube, cataloged under National Stock Number 4730-00-477-9771, 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 Precision Form Rivet Inc. Government technical data includes 13 specifications, cited from the U.S. Government catalog. The record lists 5 manufacturer part numbers 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-00-477-9771 |
| Primary Part Number | 21DHC4 |
| Item Name | Cap,tube |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Precision Form Rivet Inc |
| Status | ACTIVE |
| Connection Style | PRESSURE SEAL FLARED |
| Tube Outside Diameter for Which Designed | 0.250 INCHES NOMINAL IN |
| Style Designator | CAP, TUBE, FLARED |
| Material Document and Classification | QQ-S-763,CL 304 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Operating Pressure | 3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM LBS |
| Thread Direction | RIGHT-HAND INTERNAL |
| Nominal Thread Size | 0.438 INCHES INTERNAL IN |
| Seat Angle | 37.0 DEGREES |
| Surface Treatment | PASSIVATE OVERALL |
| Media for Which Designed | HYDRAULIC FLUID |
| Thread Class | 3B INTERNAL |
| Material | STEEL CORROSION RESISTING OVERALL |
| Thread Series Designator | UNF INTERNAL |
| 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 |
|---|---|
| 21DHC4 PRIMARY | Precision Form Rivet Inc (USA) |
| AA715C4 PRIMARY | Allan Aircraft Supply Co., Llc Dba Allan Aircraft Supply (USA) |
| 1-02817C4 PRIMARY | Eaton Aeroquip Llc Dba Jackson North 1 Div Fluid and Electrical Distribution (USA) |
| 31522C4 PRIMARY | Faber Enterprises, Inc. Div Faber Enterprise Inc (USA) |
| 111715C4 PRIMARY | Huck International, Inc (USA) |
| Reference | Meaning |
|---|---|
| 105-04715-07004 | 5/9 Secondary reference Dana Corp Weatherhead Div |
| 5109C4 | 5/9 Secondary reference Tech Aero Inc |
| C715C4 | 7/2 Vendor item drawing reference U.S. Government activity |
| 7075C4 | 5/9 Secondary reference Globe Aerospace Inc |
| 111715C4 | 5/9 Secondary reference U.S. Government activity |
NSN 4730-00-477-9771 is a Cap,tube, manufactured by Precision Form Rivet Inc, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-00-477-9771 has 5 manufacturer part numbers on file: 21DHC4 (Precision Form Rivet Inc), AA715C4 (Allan Aircraft Supply Co., Llc Dba Allan Aircraft Supply), 1-02817C4 (Eaton Aeroquip Llc Dba Jackson North 1 Div Fluid and Electrical Distribution), 31522C4 (Faber Enterprises, Inc. Div Faber Enterprise Inc), 111715C4 (Huck International, Inc).
Key specifications for 21DHC4: Connection Style: PRESSURE SEAL FLARED; Tube Outside Diameter for Which Designed: 0.250 INCHES NOMINAL IN; Style Designator: CAP, TUBE, FLARED; Material Document and Classification: QQ-S-763,CL 304 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.