PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

51503Cap,valve

Hydro-Aire Aerospace Corp · NSN 1650-00-923-1057 · FSC 1650 · No Item Name Available
Verified by PartsTable
NSN 1650-00-923-1057 — this item is cataloged by the U.S. Government under National Stock Number 1650-00-923-1057. Primary manufacturer part number: 51503.
Features
  • Cap,valve — FSC 1650
  • 2 verified cross-references
  • Primary manufacturer: Hydro-Aire Aerospace Corp
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
General Description

The Cap,valve, cataloged under National Stock Number 1650-00-923-1057, is classified within Federal Supply Class 1650 (No Item Name Available) of the Aircraft Components and Accessories group. The primary manufacturer of record is Hydro-Aire Aerospace Corp. This item has 2 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 6 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Catalog Facts
Item NameCap,valve
FSC / FSG1650 — No Item Name Available (FSG 16)
ManufacturersSikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp (CAGE 78286); Hydro-Aire Aerospace Corp (CAGE 81982)
Technical Specifications
ParameterValue
NSN1650-00-923-1057
Primary Part Number51503
Item NameCap,valve
FSC / FSG1650 / 16 — No Item Name Available
ManufacturerHydro-Aire Aerospace Corp
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 6
3110-00-144-8603 INTERCHANGEABLE
Bearing,ball,annular
2940-00-374-772451503 INTERCHANGEABLE
Filter Element,fluid
Wix Corp
4710-01-151-9021 INTERCHANGEABLE
Tube Assembly,metal
2530-01-297-012451503 INTERCHANGEABLE
Boot,vehicular Components
Husco International Inc
5340-01-502-688851503 INTERCHANGEABLE
Cap,protective,dust and Moisture
Leupold & Stevens Inc
5999-01-506-741151503 INTERCHANGEABLE
Contact,electrical
Champion Aerospace Llc
Cross-Reference Index
Part NumberManufacturer
51503 Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp (USA)
51503 PRIMARY Hydro-Aire Aerospace Corp (USA)
Related Parts
3110-00-144-8603INTERCHANGEABLE
BEARING,BALL,ANNULAR
2940-00-374-7724INTERCHANGEABLE
FILTER ELEMENT,FLUID
51503
4710-01-151-9021INTERCHANGEABLE
TUBE ASSEMBLY,METAL
2530-01-297-0124INTERCHANGEABLE
BOOT,VEHICULAR COMPONENTS
51503
5340-01-502-6888INTERCHANGEABLE
CAP,PROTECTIVE,DUST AND MOISTURE
51503
5999-01-506-7411INTERCHANGEABLE
CONTACT,ELECTRICAL
51503

Frequently Asked Questions

What is NSN 1650-00-923-1057?

NSN 1650-00-923-1057 is a Cap,valve, manufactured by Hydro-Aire Aerospace Corp, classified under FSC 1650 (No Item Name Available). Status: active.

What are the part numbers for NSN 1650-00-923-1057?

NSN 1650-00-923-1057 has 2 cross-referenced part numbers: 51503 (Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp), 51503 (Hydro-Aire Aerospace Corp).

What NSN replaces 1650-00-923-1057?

There are 6 known substitutes for 1650-00-923-1057: 3110-00-144-8603, 2940-00-374-7724, 4710-01-151-9021 and 3 more. Verify interchangeability with system specifications before substitution.

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