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253164ITEM129 — REDUCER,PIPE

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

253164ITEM129: REDUCER,PIPE.

The REDUCER,PIPE is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY OVERALL, reducer_type: CONCENTRIC, connection_type: BUTT WELD PIPE ALL ENDS, connection_style: PLAIN BEVELED (PIPE) ALL ENDS, special_features: 70/30 COPPER NICHOL; .5 INCH END LENGTH; WALL THICKNESS .109 INCH IN, nominal_overall_length: 4.250 INCHES IN. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-532-9643, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
253164ITEM129
NSN: 4730-01-532-9643
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 43689 — HUNTINGTON INGALLS INC DIV NEWPORT NEWS SHIPBUILDING (USA)
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
reducer_typeCONCENTRIC
connection_typeBUTT WELD PIPE ALL ENDS
connection_stylePLAIN BEVELED (PIPE) ALL ENDS
special_features70/30 COPPER NICHOL; .5 INCH END LENGTH; WALL THICKNESS .109 INCH IN
nominal_overall_length4.250 INCHES IN
end_item_identificationSHIP,VALVE
nominal_pipe_size_accommodated4.000 INCHES FIRST END IN
material_document_and_classification2409539 MFR REF ALL MATERIAL RESPONSES OVERALL
reduced_passage_nominal_inside_diameter2.157 INCHES SECOND END IN
part_name_assigned_by_controlling_agencyBUTT WELD REDUCER
pipe_wall_thickness_designation_for_which_designedSTANDARD ALL ENDS
NSN4730-01-532-9643
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 253164ITEM129 · OEM ⚠ VERIFY BEFORE ORDERING NPT ≠ BSPT — tapered threads look identical but are NOT interchangeable. Wrong thread = leak. JIC (37°) ≠ AN (37°) ≠ SAE 45° — flare angles must match exactly. Measure thread pitch with gauge — visual identification is unreliable ✓ BROKER TIP Always use thread sealant (PTFE tape or pipe compound) on tapered threads (NPT/BSPT). JIC/AN flare fittings seal metal-to-metal — never use tape on flare connections PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
NOMINAL PIPE SIZE ACCOMMODATED: 2.000 INCHES SECOND END IN
•
CONNECTION STYLE: PLAIN BEVELED (PIPE) ALL ENDS
•
NOMINAL OVERALL LENGTH: 4.250 INCHES IN
•
CONNECTION TYPE: BUTT WELD PIPE ALL ENDS
•
MATERIAL DOCUMENT AND CLASSIFICATION: 2409539 MFR REF ALL MATERIAL RESPONSES OVERALL
•
REDUCED PASSAGE NOMINAL INSIDE DIAMETER: 2.157 INCHES SECOND END IN
•
PIPE WALL THICKNESS DESIGNATION FOR WHICH DESIGNED: STANDARD ALL ENDS
TECHNICAL CHARACTERISTICS
NOMINAL PIPE SIZE ACCOMMODATED2.000 INCHES SECOND END IN
NOMINAL PIPE SIZE ACCOMMODATED4.000 INCHES FIRST END IN
CONNECTION STYLEPLAIN BEVELED (PIPE) ALL ENDS
NOMINAL OVERALL LENGTH4.250 INCHES IN
CONNECTION TYPEBUTT WELD PIPE ALL ENDS
MATERIAL DOCUMENT AND CLASSIFICATION2409539 MFR REF ALL MATERIAL RESPONSES OVERALL
REDUCED PASSAGE NOMINAL INSIDE DIAMETER2.157 INCHES SECOND END IN
PIPE WALL THICKNESS DESIGNATION FOR WHICH DESIGNEDSTANDARD ALL ENDS
SPECIAL FEATURES70/30 COPPER NICHOL; .5 INCH END LENGTH; WALL THICKNESS .109 INCH IN
PART NAME ASSIGNED BY CONTROLLING AGENCYBUTT WELD REDUCER
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 4730-00-000-4289 4730-00-000-4445 4730-00-000-8373 4730-00-000-8897 4730-00-001-0007 4730-00-001-0008
SUBSTITUTES & CROSS-REFERENCES 1
208-7526274ITEMF-67Reference document
Same NSN cross-reference
Reference document — Drawing number reference only
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 253164ITEM129?
253164ITEM129 is a REDUCER,PIPE.
What parts can replace 253164ITEM129?
There is 1 known substitute for 253164ITEM129: 208-7526274ITEMF-67. Substitute compatibility should be verified for your specific system.
What is the NSN for 253164ITEM129?
253164ITEM129 is cataloged in the U.S. Government catalog under NSN 4730-01-532-9643. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.