The Nipple,tube, cataloged under National Stock Number 4730-01-499-3304, 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 Dh Instruments Inc.. Government technical data includes 13 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-499-3304 |
| Primary Part Number | 400518 |
| Item Name | Nipple,tube |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Dh Instruments Inc. |
| Status | ACTIVE |
| Nominal Width Across Flats | 0.437 INCHES SECOND END IN |
| Connection Style | FLARED (TUBE) FIRST END |
| Connection Style | COMPRESSION (TUBE) SECOND END |
| Nominal Overall Length | 1.614 INCHES IN |
| Connection Type | THREADED EXTERNAL TUBE ALL ENDS |
| Style Designator | FLARED AND FLARELESS W/ CENTER WRENCHING FACILITY |
| Operating Pressure | 7252.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Leg Length | 0.315 INCHES NOMINAL SECOND END IN |
| Leg Length | 1.102 INCHES NOMINAL FIRST END IN |
| Nominal Thread Size | 0.250 INCHES FIRST END IN |
| Thread Quantity Per Inch | 28 FIRST END |
| Material | STEEL COMP 316 OVERALL |
| Thread Series Designator | UNF FIRST END |
| 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 |
|---|---|
| 400518 PRIMARY | Dh Instruments Inc. (USA) |
| Reference | Meaning |
|---|---|
| U01692 | D/9 Drawing number reference only Dh Instruments Inc. |
NSN 4730-01-499-3304 is a Nipple,tube, manufactured by Dh Instruments Inc., classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-499-3304 has 1 manufacturer part number on file: 400518 (Dh Instruments Inc.).
1 possible match (shared part number, not a government interchangeability claim): 6515-01-702-8393. Verify interchangeability with system specifications before substitution.
Key specifications for 400518: Nominal Width Across Flats: 0.437 INCHES SECOND END IN; Connection Style: FLARED (TUBE) FIRST END; Connection Style: COMPRESSION (TUBE) SECOND END; Nominal Overall Length: 1.614 INCHES IN. 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.