SAE Sight Glass Windows
Select Stock Configurations Below
  • SAE J514 Straight Thread O-Ring Boss (ORB)- threaded sight glasses
  • Exhibits no outgassing or contamination of most systems*
  • Long working life
  • No maintenance required
  • Tested to high safety factor to insure safety & reliability
  • Exceeds all industry and MIL standards
  • Engineered, Manufactured and tested at the Rayotek U.S. facility

SAE J514 sight windows are designed for use with a soft copper O-Ring (no flare). Rayotek SAE J514 fittings are used for hydraulics, machine vision systems and live observation in a variety of industries including: aviation, marine, power generation and deep-sea applications. The window material is fused or bonded to a corrosion resistant metal housing, forming a hermetically sealed single-piece sight glass. The advantage of this construction is a simple, clean, easy to install system that works excellent in high-pressure applications.

Rayotek SAE Sight Windows are exceptionally robust in extreme thermal, chemical, mechanical and pressure environments. They also perform exceptionally in ultra-high vacuum, high purity, cleanroom rated systems.

Click Configuration for Pricing & Drawings.

Temperature Range
General purpose indicator & observation, vacuum to ultra high pressure. NACE MR0175/ISO15156 compliant
0 Kelvin - 400C
Optical quality, extreme scratch resistance for UV, visible and IR viewing
0 Kelvin - 200C


  • High pressure tanks liquid level view ports
  • Hydraulic sight windows for aviation, nautical, submarine and vehicles
  • Shallow to full ocean depth seawater applications
  • Geothermal wells
  • Biofuel plants
  • Oil & gas exploration & production
  • Viewports for inspection and observation

Rayotek sight windows can transmit a broad range of wavelengths and are capable of operating under extreme temperature, pressure, chemical and mechanical conditions. The selection of window and housing materials will determine capabilities.

† Alternative materials are available upon request including, but not limited to:
        Housing: duplex, aluminum, Monel, Inconel, plastics and alumina
        Window: borosilicate (Pyrex®), diamond, Zinc Selenide, fused silica, germanium, MgF2, silicon and YAG

*  For systems where purity & cleanliness are critical, Rayotek recommends testing the Sight Window for specific chemical compatibility.
    Call for information.

** Typical leak rate is 10-8 bar-CC/sec. for air at 22C. Actual leak rate TBD based on window size and maximum operating temperature.
    Call for information.

Contact Us with questions or to discuss your requirements and we'll be happy to help