The Adapter,straight,flange to Boss, cataloged under National Stock Number 4730-01-031-2839, 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 Bird-Johnson Propeller Company, Llc. Government technical data includes 15 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-031-2839 |
| Primary Part Number | C156SKDD963-10 |
| Item Name | Adapter,straight,flange to Boss |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Bird-Johnson Propeller Company, Llc |
| Status | ACTIVE |
| Flange Shape | ROUND WITH HOLES FIRST END |
| Flange Face Design | PLAIN FIRST END |
| Connection Style | EXTERNAL SEAT FOR GASKET SEAL (BOSS) SECOND END |
| Bolt Circle Nominal Diameter | 3.938 INCHES FIRST END IN |
| Nominal Overall Length | 6.219 INCHES IN |
| Connection Type | THREADED EXTERNAL BOSS SECOND END |
| Connection Type | FLANGE FIRST END |
| Bolt Hole Nominal Diameter | 0.562 INCHES FIRST END IN |
| Nominal Thread Size | 1.875 INCHES SECOND END IN |
| Nominal Outside Diameter | 0.500 INCHES FIRST END IN |
| Bolt Hole Quantity | 6 FIRST END |
| Thread Class | 2A SECOND END A |
| Material | COPPER ALLOY OVERALL |
| Thread Series Designator | UNF SECOND END |
| Nominal Thickness | 0.437 INCHES FIRST END IN |
| 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 |
|---|---|
| C156SKDD963-10 PRIMARY | Bird-Johnson Propeller Company, Llc (USA) |
| Reference | Meaning |
|---|---|
| 4730PL1289903 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| 525-141-142 | 3/2 Design control — primary reference U.S. Government activity |
| 115654001PC34 | 5/9 Secondary reference Bird-Johnson Propeller Company, Llc |
NSN 4730-01-031-2839 is a Adapter,straight,flange to Boss, manufactured by Bird-Johnson Propeller Company, Llc, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-031-2839 has 1 manufacturer part number on file: C156SKDD963-10 (Bird-Johnson Propeller Company, Llc).
Key specifications for C156SKDD963-10: Flange Shape: ROUND WITH HOLES FIRST END; Flange Face Design: PLAIN FIRST END; Connection Style: EXTERNAL SEAT FOR GASKET SEAL (BOSS) SECOND END; Bolt Circle Nominal Diameter: 3.938 INCHES FIRST END IN. 15 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.