PartsTable TECHNICAL DATA SHEET
NSN 4730-01-170-9780Government record, cited

Union, Pipe to Tube4730-01-170-9780

NSN 4730-01-170-9780 · NIIN 011709780
FSC 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings · FSG 47 — Pipe, Tubing, Hose, and Fittings
Government record, cited
Also searched as  4730-01-170-9780 · 4730011709780 · NIIN 011709780 · 01-170-9780 · FSC 4730 Hose, Pipe, Tube, Lubrication, and Railing Fittings · 2621-021-01 · 14-97-0177 · 2621-021-01ASSY 95 · 845-4775990
Nearby stock numbers  ·
Features
  • Union,pipe to Tube — FSC 4730
  • Furnished Items and Quantity: 2 PREFORMED PACKING
  • Nominal Pipe Size Accommodated: 0.500 INCHES SECOND END IN
  • Connection Style: PLAIN (TUBE) FIRST END
  • Connection Style: PLAIN (PIPE) SECOND END
  • Nominal Overall Length: 1.550 INCHES IN
  • Connection Type: UNTHREADED EXTERNAL PIPE SECOND END
  • Connection Type: THREADED EXTERNAL TUBE FIRST END
Identification
  • NSN: 4730-01-170-9780
  • NIIN: 011709780
  • FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
  • FSG: 47 — Pipe, Tubing, Hose, and Fittings
General Description

The Union,pipe to Tube, cataloged under National Stock Number 4730-01-170-9780, 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 20 specifications, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 9 items share a part number with this NSN in the catalog (possible match — not a government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
NSN4730-01-170-9780
Item NameUnion,pipe to Tube
FSC / FSG4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
StatusACTIVE
Furnished Items and Quantity2 PREFORMED PACKING
Nominal Pipe Size Accommodated0.500 INCHES SECOND END IN
Connection StylePLAIN (TUBE) FIRST END
Connection StylePLAIN (PIPE) SECOND END
Nominal Overall Length1.550 INCHES IN
Connection TypeUNTHREADED EXTERNAL PIPE SECOND END
Connection TypeTHREADED EXTERNAL TUBE FIRST END
Style DesignatorSCREWED
Material Document and ClassificationQQ-N-281 FED SPEC SINGLE MATERIAL RESPONSE NUT
Material Document and ClassificationQQ-C-390/D5,TY3 FED SPEC SINGLE MATERIAL RESPONSE THREAD PIECE
Material Document and ClassificationQQ-S-741 FED SPEC SINGLE MATERIAL RESPONSE TAILPIECE
Nominal Outside Diameter Tube Accommodated0.500 INCHES FIRST END IN
Operating Pressure3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
Seat TypeRECESSED
Nominal Thread Size0.750 INCHES FIRST END IN
Thread Class2A FIRST END A
MaterialCOPPER ALLOY THREAD PIECE
MaterialCOPPER NUT
MaterialSTEEL TAILPIECE
Thread Series DesignatorUNF FIRST END
Lifecycle & Compliance
Acquisition StatusACTIVE
DEMIL CodeDEMIL A — No Demilitarization Required
HazardNo hazard code in the DLA record (HMIC N)
Criticality CodeX
⇄ Related Items 9
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
4730-01-193-73922621-791-05 PC20 POSSIBLE MATCH
TAILPIECE,UNION
Possible match (shared part number)Triumph Manufacturing Company, Inc.
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
4730-01-307-89252621-791-05 PIECE 71 POSSIBLE MATCH
TAILPIECE,UNION
Possible match (shared part number)Electric Boat Corporation Div General Dynamics Electric Boat
4730-01-314-8911845-4775990 PIECE 17A POSSIBLE MATCH
TAILPIECE,UNION
Possible match (shared part number)Electric Boat Corporation Div General Dynamics Electric Boat
4730-01-329-158914-97-5145 POSSIBLE MATCH
TAILPIECE,UNION
Possible match (shared part number)Electric Boat Corporation Div General Dynamics Electric Boat
4730-01-334-12032621-791-05 PIECE 70 POSSIBLE MATCH
TAILPIECE,UNION
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
2621-021-01 D/9 Drawing number reference only
U.S. Government activity
14-97-0177 3/2 Design control — primary reference
U.S. Government activity
2621-021-01ASSY 95 5/2 Secondary reference
U.S. Government activity
845-4775990 D/9 Drawing number reference only
U.S. Government activity
Related Parts
4730-01-193-7392POSSIBLE MATCH
TAILPIECE,UNION
2621-791-05 PC20
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
4730-01-307-8925POSSIBLE MATCH
TAILPIECE,UNION
2621-791-05 PIECE 71
4730-01-314-8911POSSIBLE MATCH
TAILPIECE,UNION
845-4775990 PIECE 17A
4730-01-329-1589POSSIBLE MATCH
TAILPIECE,UNION
14-97-5145
4730-01-334-1203POSSIBLE MATCH
TAILPIECE,UNION
2621-791-05 PIECE 70

Frequently Asked Questions

What is NSN 4730-01-170-9780?

NSN 4730-01-170-9780 is a Union,pipe to Tube, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.

What NSN replaces 4730-01-170-9780?

9 possible matches (shared part number, not a government interchangeability claim): 4730-01-193-7392, 4730-01-307-8429, 4730-01-307-8430. Verify interchangeability with system specifications before substitution.

What are the specifications of 4730-01-170-9780?

Key specifications for 4730-01-170-9780: Furnished Items and Quantity: 2 PREFORMED PACKING; Nominal Pipe Size Accommodated: 0.500 INCHES SECOND END IN; Connection Style: PLAIN (TUBE) FIRST END; Connection Style: PLAIN (PIPE) SECOND END. 20 specifications are documented in the U.S. Government catalog.

Is NSN 4730-01-170-9780 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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