Tailpiece, Union4730-01-602-7780

NSN 4730-01-602-7780 · NIIN 016027780 · Part number 803-7657203ITEM138

Naval Sea Systems Command · FSC 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings · FSG 47 — Pipe, Tubing, Hose, and Fittings · CAGE 53711

Government record, cited

NSN 4730-01-602-7780 — this item is cataloged by the U.S. Government under National Stock Number 4730-01-602-7780. Manufacturer of record part number: 803-7657203ITEM138.

Also searched as 4730-01-602-7780 · 4730016027780 · NIIN 016027780 · 01-602-7780 · FSC 4730 Hose, Pipe, Tube, Lubrication, and Railing Fittings · CAGE 53711 · 803-7657203ITEM138 · DF314326ITEM138

Nearby stock numbers ← 4730-01-602-7745 Adapter, Straight, Tube to Boss · 4730-01-602-7781 Coupling Half, Quick Disconnect →

4730-01-602-7780 — Hose, Pipe, Tube, Lubrication, and Railing Fittings

Features

Tailpiece,union — FSC 4730
Nominal Pipe Size Designation: 2.000 INCHES IN
End Connection Type: WELDED
Tubing Outside Diameter: 2.375 INCHES NOMINAL IN
Material: STEEL
2 manufacturer part numbers on file
Manufacturer of record: Naval Sea Systems Command

Identification

NSN: 4730-01-602-7780
NIIN: 016027780
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
FSG: 47 — Pipe, Tubing, Hose, and Fittings
Primary part number: 803-7657203ITEM138
Manufacturer: Naval Sea Systems Command

General Description

The Tailpiece,union, cataloged under National Stock Number 4730-01-602-7780, 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 Naval Sea Systems Command. Government technical data includes 4 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. Current acquisition status: Active.

Technical Specifications

Parameter	Value
NSN	4730-01-602-7780
Primary Part Number	803-7657203ITEM138
Item Name	Tailpiece,union
FSC / FSG	4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
Manufacturer	Naval Sea Systems Command
Status	ACTIVE
Nominal Pipe Size Designation	2.000 INCHES IN
End Connection Type	WELDED
Tubing Outside Diameter	2.375 INCHES NOMINAL IN
Material	STEEL

Lifecycle & Compliance

Acquisition Status	ACTIVE
DEMIL Code	DEMIL A — No Demilitarization Required
Hazard	No hazard code in the DLA record (HMIC N)
Criticality Code	X

Cross-Reference Index

Part Number	Manufacturer
803-7657203ITEM138 PRIMARY	Naval Sea Systems Command (USA)
DF314326ITEM138	Huntington Ingalls Inc Div Newport News Shipbuilding (USA)

No interchangeability data on file.

Other items in FSC 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings

Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.

4730-00-000-1895

4730-00-000-1895 · Item name not on file

4730-00-000-4289

4730-00-000-4289 · Item name not on file

4730-00-000-4445

4730-00-000-4445 · Item name not on file

4730-00-000-8373

4730-00-000-8373 · Item name not on file

4730-00-000-8897

4730-00-000-8897 · Item name not on file

4730-00-001-0007

4730-00-001-0007 · Item name not on file

4730-00-001-0008

COUPLING,TUBE

4730-00-001-0008

COUPLING,TUBE

Frequently Asked Questions

What is NSN 4730-01-602-7780?

NSN 4730-01-602-7780 is a Tailpiece,union, manufactured by Naval Sea Systems Command, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.

What part numbers are listed for NSN 4730-01-602-7780?

NSN 4730-01-602-7780 has 2 manufacturer part numbers on file: 803-7657203ITEM138 (Naval Sea Systems Command), DF314326ITEM138 (Huntington Ingalls Inc Div Newport News Shipbuilding).

What are the specifications of 803-7657203ITEM138?

Key specifications for 803-7657203ITEM138: Nominal Pipe Size Designation: 2.000 INCHES IN; End Connection Type: WELDED; Tubing Outside Diameter: 2.375 INCHES NOMINAL IN; Part Name Assigned by Controlling Agency: TAILPIECE, 2 NPS. 4 specifications are documented in the U.S. Government catalog.

Is NSN 4730-01-602-7780 hazardous material?

No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.

Sources

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.

✓ Data cited from the U.S. Government catalog; commercial cross-references from OEM and certified industry sources.

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