The Nut,tube Coupling, cataloged under National Stock Number 4730-01-181-8629, 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 Sps Technologies, Llc Dba PB Fasteners. Government technical data includes 14 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4730-01-181-8629 |
| Primary Part Number | CN8D-6 |
| Item Name | Nut,tube Coupling |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Sps Technologies, Llc Dba PB Fasteners |
| Status | ACTIVE |
| Length to Shoulder | 0.500 INCHES NOMINAL IN |
| Width Across Flats | 0.688 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | MIL-A-8625,TYPE 1,CLASS 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Series | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Material Document and Classification | QQ-A-225/6 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.562 INCHES IN |
| Nut Height | 0.724 INCHES NOMINAL IN |
| Surface Treatment | ANODIZE OVERALL |
| Nut Style | TUBE COUPLING |
| Thread Class | 3B |
| Thread Quantity Per Inch | 18 |
| Material | ALUMINUM ALLOY OVERALL |
| Nominal Tube Outside Diameter | 0.375 INCHES 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 |
|---|---|
| CN8D-6 PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
| LE273-0016-0006 | The Boeing Company Div Legacy Am&m (USA) |
| Reference | Meaning |
|---|---|
| LE273-0016 | D/9 Drawing number reference only The Boeing Company Div Legacy Am&m |
NSN 4730-01-181-8629 is a Nut,tube Coupling, manufactured by Sps Technologies, Llc Dba PB Fasteners, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-181-8629 has 2 manufacturer part numbers on file: CN8D-6 (Sps Technologies, Llc Dba PB Fasteners), LE273-0016-0006 (The Boeing Company Div Legacy Am&m).
1 possible match (shared part number, not a government interchangeability claim): 4730-01-354-9963. Verify interchangeability with system specifications before substitution.
Key specifications for CN8D-6: Length to Shoulder: 0.500 INCHES NOMINAL IN; Width Across Flats: 0.688 INCHES NOMINAL IN; Surface Treatment Document and Classification: MIL-A-8625,TYPE 1,CLASS 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Series: UNIFIED NATIONAL JOINT FINE (UNJF). 14 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.