PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

850074Valve,reducing Assembly

Westinghouse Air Brake Technologies Corp Dba Westinghouse Air Brake Technologies Corp · NSN 4820-00-771-4729 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-00-771-4729 — this item is cataloged by the U.S. Government under National Stock Number 4820-00-771-4729. Primary manufacturer part number: 850074.
Features
  • Valve,reducing Assembly — FSC 4820
  • General Characteristics Item Description: STEEL; 6.750 IN. LG; 3.432 IN. W; FLANGE 4.970 IN. LG; 2.248 IN. W; TWO MTG HOLES 0.415 IN. DIA; 0.507 IN. THICK IN
  • 6 verified cross-references
  • Primary manufacturer: Westinghouse Air Brake Technologies Corp Dba Westinghouse Air Brake Technologies Corp
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
General Description

The Valve,reducing Assembly, cataloged under National Stock Number 4820-00-771-4729, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Westinghouse Air Brake Technologies Corp Dba Westinghouse Air Brake Technologies Corp. Government technical data includes 1 verified specification, sourced from the Federal Logistics Information System (FLIS). This item has 6 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 3 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN4820-00-771-4729
Primary Part Number850074
Item NameValve,reducing Assembly
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerWestinghouse Air Brake Technologies Corp Dba Westinghouse Air Brake Technologies Corp
StatusCANCELLED
General Characteristics Item DescriptionSTEEL; 6.750 IN. LG; 3.432 IN. W; FLANGE 4.970 IN. LG; 2.248 IN. W; TWO MTG HOLES 0.415 IN. DIA; 0.507 IN. THICK IN
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 3
5330-00-359-1698 INTERCHANGEABLE
Gasket
4140-00-455-6335020293 INTERCHANGEABLE
Fan,tubeaxial
Rotron Incorporated
7025-01-496-2579850074 INTERCHANGEABLE
Interface Unit,data Transfer
Tyto Athene, Llc
Cross-Reference Index
Part NumberManufacturer
850074 Westinghouse Air Brake Technologies Corp Dba Westinghouse Air Brake Technologies Corp (USA)
527647 Westinghouse Air Brake Technologies Corp Dba Westinghouse Air Brake Technologies Corp (USA)
P55504-0100 Westinghouse Air Brake Technologies Corp Dba Westinghouse Air Brake Technologies Corp (USA)
850074 Bosch Rexroth Corporation Div Bosch Rexroth (USA)
P55504-0100 Bosch Rexroth Corporation Div Bosch Rexroth (USA)
527647 Bosch Rexroth Corporation Div Bosch Rexroth (USA)
Related Parts
5330-00-359-1698INTERCHANGEABLE
GASKET
4140-00-455-6335INTERCHANGEABLE
FAN,TUBEAXIAL
020293
7025-01-496-2579INTERCHANGEABLE
INTERFACE UNIT,DATA TRANSFER
850074

Frequently Asked Questions

What is NSN 4820-00-771-4729?

NSN 4820-00-771-4729 is a Valve,reducing Assembly, manufactured by Westinghouse Air Brake Technologies Corp Dba Westinghouse Air Brake Technologies Corp, classified under FSC 4820 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 4820-00-771-4729?

NSN 4820-00-771-4729 has 6 cross-referenced part numbers: 850074 (Westinghouse Air Brake Technologies Corp Dba Westinghouse Air Brake Technologies Corp), 527647 (Westinghouse Air Brake Technologies Corp Dba Westinghouse Air Brake Technologies Corp), P55504-0100 (Westinghouse Air Brake Technologies Corp Dba Westinghouse Air Brake Technologies Corp), 850074 (Bosch Rexroth Corporation Div Bosch Rexroth), P55504-0100 (Bosch Rexroth Corporation Div Bosch Rexroth) and 1 more.

What NSN replaces 4820-00-771-4729?

There are 3 known substitutes for 4820-00-771-4729: 5330-00-359-1698, 4140-00-455-6335, 7025-01-496-2579. Verify interchangeability with system specifications before substitution.

What are the specifications of 850074?

Key specifications for 850074: General Characteristics Item Description: STEEL; 6.750 IN. LG; 3.432 IN. W; FLANGE 4.970 IN. LG; 2.248 IN. W; TWO MTG HOLES 0.415 IN. DIA; 0.507 IN. THICK IN. 1 total characteristics are documented in the Federal Logistics Information System.

Is NSN 4820-00-771-4729 still in active supply?

NSN 4820-00-771-4729 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.
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