PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

900C277PC3Cap,valve

Westinghouse Electric Corp · NSN 4820-01-304-6590 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-01-304-6590 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-304-6590. Primary manufacturer part number: 900C277PC3.
Features
  • Cap,valve — FSC 4820
  • Reference Number Differentiating Characteristics: MATERIAL WILL BE IN ACCORDANCE WITH SHIPS PARTS CONTROL CENTER ACTIVITY HX QUALITY CONTROL,MANUFACTURING AND TESTING SPECIFICATIONS
  • Criticality Code Justification: ZZZY
  • 2 verified cross-references
  • Primary manufacturer: Westinghouse Electric Corp
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
General Description

The Cap,valve, cataloged under National Stock Number 4820-01-304-6590, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Westinghouse Electric Corp. Government technical data includes 2 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. 1 verified substitute exists in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN4820-01-304-6590
Primary Part Number900C277PC3
Item NameCap,valve
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerWestinghouse Electric Corp
StatusACTIVE
Reference Number Differentiating CharacteristicsMATERIAL WILL BE IN ACCORDANCE WITH SHIPS PARTS CONTROL CENTER ACTIVITY HX QUALITY CONTROL,MANUFACTURING AND TESTING SPECIFICATIONS
Criticality Code JustificationZZZY
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 1
4810-00-585-2531 INTERCHANGEABLE
Cap,valve
Cross-Reference Index
Part NumberManufacturer
900C277PC3 Westinghouse Electric Corp (USA)
900J768PC65 Westinghouse Electric Corp (USA)
Related Parts
4810-00-585-2531INTERCHANGEABLE
CAP,VALVE

Frequently Asked Questions

What is NSN 4820-01-304-6590?

NSN 4820-01-304-6590 is a Cap,valve, manufactured by Westinghouse Electric Corp, classified under FSC 4820 (No Item Name Available). Status: active.

What are the part numbers for NSN 4820-01-304-6590?

NSN 4820-01-304-6590 has 2 cross-referenced part numbers: 900C277PC3 (Westinghouse Electric Corp), 900J768PC65 (Westinghouse Electric Corp).

What NSN replaces 4820-01-304-6590?

There is 1 known substitute for 4820-01-304-6590: 4810-00-585-2531. Verify interchangeability with system specifications before substitution.

What are the specifications of 900C277PC3?

Key specifications for 900C277PC3: Reference Number Differentiating Characteristics: MATERIAL WILL BE IN ACCORDANCE WITH SHIPS PARTS CONTROL CENTER ACTIVITY HX QUALITY CONTROL,MANUFACTURING AND TESTING SPECIFICATIONS; Criticality Code Justification: ZZZY; Special Features: MATERIAL:CRES STEEL COMPOSITION 304,CONDITION A,CLEANING WILL BE PER MIL-STD-767. 3 total characteristics are documented in the Federal Logistics Information System.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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