PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

WWP521TYPE1Reducer,pipe

Federal Specifications Promulgated by General Services Administration Washington DC · NSN 4730-01-023-5541 · FSC 4730 · No Item Name Available
Verified by PartsTable
NSN 4730-01-023-5541 — this item is cataloged by the U.S. Government under National Stock Number 4730-01-023-5541. Primary manufacturer part number: WWP521TYPE1.
Features
  • Reducer,pipe — FSC 4730
  • Connection Type: THREADED INTERNAL PIPE ALL ENDS
  • Nominal Thread Size: 1.250 INCHES SECOND END IN
  • Maximum Operating Temp: 260.0 CELSIUS FIRST RESPONSE DEGC
  • Nominal Overall Length: 2.062 INCHES IN
  • Thread Series Designator: NPT ALL ENDS
  • Nominal Thread Size: 1.500 INCHES FIRST END IN
  • Material Document and Classification: ASTM A197 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
Applications
  • Fluid conveyance
  • Hydraulic system plumbing
  • Pneumatic line routing
  • Applications requiring Iron Overall construction
General Description

The Reducer,pipe, cataloged under National Stock Number 4730-01-023-5541, is classified within Federal Supply Class 4730 (No Item Name Available) of the Pipe, Tubing, Hose, and Fittings group. The primary manufacturer of record is Federal Specifications Promulgated by General Services Administration Washington DC. Government technical data includes 13 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 2 commercial cross-references from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN4730-01-023-5541
Primary Part NumberWWP521TYPE1
Item NameReducer,pipe
FSC / FSG4730 / 47 — No Item Name Available
ManufacturerFederal Specifications Promulgated by General Services Administration Washington DC
StatusCANCELLED
Connection TypeTHREADED INTERNAL PIPE ALL ENDS
Nominal Thread Size1.250 INCHES SECOND END IN
Maximum Operating Temp260.0 CELSIUS FIRST RESPONSE DEGC
Nominal Overall Length2.062 INCHES IN
Thread Series DesignatorNPT ALL ENDS
Nominal Thread Size1.500 INCHES FIRST END IN
Material Document and ClassificationASTM A197 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
Specification/standard Data81348-WW-P-521 GOVERNMENT SPECIFICATION
Reducer TypeCONCENTRIC
Connection StylePLAIN (PIPE) ALL ENDS
Maximum Operating Temp65.6 CELSIUS SECOND RESPONSE DEGC
Nondefinitive Spec/std Data1 TYPE
MaterialIRON OVERALL
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 12
4730-00-088-8576 INTERCHANGEABLE
Elbow,pipe
4730-00-203-8358 INTERCHANGEABLE
Coupling,pipe
4730-00-231-2410 INTERCHANGEABLE
Cap,pipe
4730-00-246-9188119095 INTERCHANGEABLE
Elbow,pipe
Rolls-Royce Solutions America Inc
4730-00-246-9190 INTERCHANGEABLE
Elbow,pipe
4730-00-246-9218 INTERCHANGEABLE
Elbow,pipe
4730-00-265-9706 INTERCHANGEABLE
Tee,pipe
4730-00-277-1986 INTERCHANGEABLE
Elbow,pipe
4730-00-277-2782 INTERCHANGEABLE
Reducer,pipe
4730-00-277-2863MPD9484-3A1-1 INTERCHANGEABLE
Elbow,pipe
Met-Pro Corporation
Cross-Reference Index
Part NumberManufacturer
WWP521TYPE1 Federal Specifications Promulgated by General Services Administration Washington DC (USA)
WWP521 TYPE1 Federal Specifications Promulgated by General Services Administration Washington DC (USA)
Related Parts
4730-00-088-8576INTERCHANGEABLE
ELBOW,PIPE
4730-00-203-8358INTERCHANGEABLE
COUPLING,PIPE
4730-00-231-2410INTERCHANGEABLE
CAP,PIPE
4730-00-246-9188INTERCHANGEABLE
ELBOW,PIPE
119095
4730-00-246-9190INTERCHANGEABLE
ELBOW,PIPE
4730-00-246-9218INTERCHANGEABLE
ELBOW,PIPE
4730-00-265-9706INTERCHANGEABLE
TEE,PIPE
4730-00-277-1986INTERCHANGEABLE
ELBOW,PIPE
4730-00-277-2782INTERCHANGEABLE
REDUCER,PIPE
4730-00-277-2863INTERCHANGEABLE
ELBOW,PIPE
MPD9484-3A1-1
4730-00-278-2954INTERCHANGEABLE
ELBOW,PIPE
218219
4730-00-278-4422INTERCHANGEABLE
TEE,PIPE

Frequently Asked Questions

What is NSN 4730-01-023-5541?

NSN 4730-01-023-5541 is a Reducer,pipe, manufactured by Federal Specifications Promulgated by General Services Administration Washington DC, classified under FSC 4730 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 4730-01-023-5541?

NSN 4730-01-023-5541 has 2 cross-referenced part numbers: WWP521TYPE1 (Federal Specifications Promulgated by General Services Administration Washington DC), WWP521 TYPE1 (Federal Specifications Promulgated by General Services Administration Washington DC).

What NSN replaces 4730-01-023-5541?

There are 12 known substitutes for 4730-01-023-5541: 4730-00-088-8576, 4730-00-203-8358, 4730-00-231-2410 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of WWP521TYPE1?

Key specifications for WWP521TYPE1: Connection Type: THREADED INTERNAL PIPE ALL ENDS; Nominal Thread Size: 1.250 INCHES SECOND END IN; Maximum Operating Temp: 260.0 CELSIUS FIRST RESPONSE DEGC; Nominal Overall Length: 2.062 INCHES IN. 13 total characteristics are documented in the Federal Logistics Information System.

Is NSN 4730-01-023-5541 still in active supply?

NSN 4730-01-023-5541 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com