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NSN 4730-01-137-2753Government record, cited
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Tailpiece, Union4730-01-137-2753

NSN 4730-01-137-2753 · NIIN 011372753
FSC 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings · FSG 47 — Pipe, Tubing, Hose, and Fittings
Government record, cited
Also searched as  4730-01-137-2753 · 4730011372753 · NIIN 011372753 · 01-137-2753 · FSC 4730 Hose, Pipe, Tube, Lubrication, and Railing Fittings · 2621-791-05ASSY · 845-4775990 PC 43 · 2621-791-05PIECE43 · 2621-791-05 · 845-4775990
Nearby stock numbers  ·
L 2.750 INCHES NOMINAL IN HOSE FITTING
4730-01-137-2753 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
Features
  • Tailpiece,union — FSC 4730
  • Nominal Pipe Size Designation: 1.000 INCHES IN
  • Flange Thickness: 0.312 INCHES MINIMUM AND 0.328 INCHES MAXIMUM IN
  • End Connection Type: WELDED
  • Seat Type: GASKET
  • Material: STEEL COMP 304
  • Flange Outside Diameter: 2.188 INCHES MINIMUM AND 2.203 INCHES MAXIMUM IN
  • Working Pressure and Service Type: 4500.0 POUNDS PER SQUARE INCH (PSI) NOMINAL WATER LBS
Identification
  • NSN: 4730-01-137-2753
  • NIIN: 011372753
  • FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
  • FSG: 47 — Pipe, Tubing, Hose, and Fittings
General Description

The Tailpiece,union, cataloged under National Stock Number 4730-01-137-2753, is classified within Federal Supply Class 4730 (Hose, Pipe, Tube, Lubrication, and Railing Fittings) of the Pipe, Tubing, Hose, and Fittings group. Government technical data includes 7 specifications, cited from the U.S. Government catalog. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 12 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN4730-01-137-2753
Item NameTailpiece,union
FSC / FSG4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
StatusACTIVE
Nominal Pipe Size Designation1.000 INCHES IN
Flange Thickness0.312 INCHES MINIMUM AND 0.328 INCHES MAXIMUM IN
End Connection TypeWELDED
Seat TypeGASKET
MaterialSTEEL COMP 304
Flange Outside Diameter2.188 INCHES MINIMUM AND 2.203 INCHES MAXIMUM IN
Working Pressure and Service Type4500.0 POUNDS PER SQUARE INCH (PSI) NOMINAL WATER LBS
Lifecycle & Compliance
Acquisition StatusACTIVE
DEMIL CodeDEMIL Q — CCL Item — Commerce Control List
HazardNo hazard code in the DLA record (HMIC N)
Criticality CodeX
⇄ Related Items 12
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
4730-01-151-40322621-791-05PC37 POSSIBLE MATCH
TAILPIECE,UNION
Possible match (shared part number)Electric Boat Corporation Div General Dynamics Electric Boat
4730-01-152-026015-97-4585 POSSIBLE MATCH
TAILPIECE,UNION
Possible match (shared part number)Electric Boat Corporation Div General Dynamics Electric Boat
4730-01-170-978014-97-0177 POSSIBLE MATCH
UNION,PIPE TO TUBE
Possible match (shared part number)Electric Boat Corporation Div General Dynamics Electric Boat
4730-01-193-73922621-791-05 PC20 POSSIBLE MATCH
TAILPIECE,UNION
Possible match (shared part number)Triumph Manufacturing Company, Inc.
4730-01-307-00332621-791-05 PIECE117 POSSIBLE MATCH
TAILPIECE,UNION
Possible match (shared part number)Electric Boat Corporation Div General Dynamics Electric Boat
4730-01-307-84292621-791-05 PIECE 71X2.75 POSSIBLE MATCH
UNION,PIPE TO TUBE
Possible match (shared part number)Electric Boat Corporation Div General Dynamics Electric Boat
4730-01-307-84302621-791-05 PIECE 71X5.25 POSSIBLE MATCH
UNION,PIPE TO TUBE
Possible match (shared part number)Electric Boat Corporation Div General Dynamics Electric Boat
4730-01-307-84312621-791-05 PIECE 71X3.62 POSSIBLE MATCH
UNION,PIPE TO TUBE
Possible match (shared part number)Electric Boat Corporation Div General Dynamics Electric Boat
4730-01-307-84322621-791-05 PIECE 71X4.37 POSSIBLE MATCH
UNION,PIPE TO TUBE
Possible match (shared part number)Electric Boat Corporation Div General Dynamics Electric Boat
4730-01-307-84372621-791-05 ASSY 120 POSSIBLE MATCH
REDUCER,PIPE
Possible match (shared part number)Electric Boat Corporation Div General Dynamics Electric Boat
Cross-Reference Index
No manufacturer part numbers on file in the U.S. Government catalog.
Reference documents
ReferenceMeaning
2621-791-05ASSY C/1 Advisory reference — outside the item-of-supply concept
U.S. Government activity
845-4775990 PC 43 C/1 Advisory reference — outside the item-of-supply concept
U.S. Government activity
2621-791-05PIECE43 3/2 Design control — primary reference
U.S. Government activity
2621-791-05 D/9 Drawing number reference only
U.S. Government activity
845-4775990 D/9 Drawing number reference only
U.S. Government activity
Related Parts
4730-01-151-4032POSSIBLE MATCH
TAILPIECE,UNION
2621-791-05PC37
4730-01-152-0260POSSIBLE MATCH
TAILPIECE,UNION
15-97-4585
4730-01-170-9780POSSIBLE MATCH
UNION,PIPE TO TUBE
14-97-0177
4730-01-193-7392POSSIBLE MATCH
TAILPIECE,UNION
2621-791-05 PC20
4730-01-307-0033POSSIBLE MATCH
TAILPIECE,UNION
2621-791-05 PIECE117
4730-01-307-8429POSSIBLE MATCH
UNION,PIPE TO TUBE
2621-791-05 PIECE 71X2.75
4730-01-307-8430POSSIBLE MATCH
UNION,PIPE TO TUBE
2621-791-05 PIECE 71X5.25
4730-01-307-8431POSSIBLE MATCH
UNION,PIPE TO TUBE
2621-791-05 PIECE 71X3.62
4730-01-307-8432POSSIBLE MATCH
UNION,PIPE TO TUBE
2621-791-05 PIECE 71X4.37
4730-01-307-8437POSSIBLE MATCH
REDUCER,PIPE
2621-791-05 ASSY 120
4730-01-307-8925POSSIBLE MATCH
TAILPIECE,UNION
2621-791-05 PIECE 71
4730-01-309-5119POSSIBLE MATCH
TAILPIECE,UNION
2621-791-05 PIECE 142

Frequently Asked Questions

What is NSN 4730-01-137-2753?

NSN 4730-01-137-2753 is a Tailpiece,union, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.

What NSN replaces 4730-01-137-2753?

12 possible matches (shared part number, not a government interchangeability claim): 4730-01-151-4032, 4730-01-152-0260, 4730-01-170-9780. Verify interchangeability with system specifications before substitution.

What are the specifications of 4730-01-137-2753?

Key specifications for 4730-01-137-2753: Nominal Pipe Size Designation: 1.000 INCHES IN; Flange Thickness: 0.312 INCHES MINIMUM AND 0.328 INCHES MAXIMUM IN; End Connection Type: WELDED; Overall Length: 2.750 INCHES NOMINAL IN. 7 specifications are documented in the U.S. Government catalog.

Is NSN 4730-01-137-2753 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.

What is the DEMIL code for NSN 4730-01-137-2753?

NSN 4730-01-137-2753 has DEMIL Code Q. Demilitarization may be required before disposal or transfer to non-military entities.

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.

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