SAE Sight Glass Windows
  • 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.

Applications:

  • 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.

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Footnotes:
† 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.

(All SAE's by Material, listed by configuration)

SAE SODA LIME FUSED IN 316SS (High Pressure)

SAE SIZE
Nominal
J514 ORB
SAE Tube
Size (in)
Part
Number
Pressure
Rating*
(psi/bar)
Min. Operating
Temperature
˚C (˚F)
Max. Operating
Temperature
˚C (˚F)
Internal (IP), External (EP) or Vacuum (VAC) Window
Material
Housing
Material
Clear Aperture
In. (mm)
O.D.
Across
Flats
in. (mm)
Additional Info
-4 1/4 101097 4000 (276) -60 (-51) 200 (392) EP, IP, VAC SodaLime (Fused) 316 Stainless 0.39 (9.9) 0.78 (19.8) In Stock
-6 3/8 101098 4000 (276) -60 (-51) 200 (392) EP, IP, VAC SodaLime (Fused) 316 Stainless 0.48 (12.2) 0.92 (23.4) In Stock
-8 1/2 101099 4000 (276) -60 (-51) 200 (392) EP, IP, VAC SodaLime (Fused) 316 Stainless 0.59 (15.0) 1.14 (29.0) In Stock
-12 3/4 101100 4000 (276) -60 (-51) 200 (392) EP, IP, VAC SodaLime (Fused) 316 Stainless 0.81 (20.6) 1.58 (40.1) In Stock
-16 1 101101 4000 (276) -60 (-51) 200 (392) EP, IP, VAC SodaLime (Fused) 316 Stainless 0.96 (24.4) 1.79 (45.5) In Stock
-20 1-1/4 101102 4000 (276) -60 (-51) 200 (392) EP, IP, VAC SodaLime (Fused) 316 Stainless 1.32 (33.5) 2.30 (58.4) In Stock
-24 1-1/2 101103 4000 (276) -60 (-51) 200 (392) EP, IP, VAC SodaLime (Fused) 316 Stainless 1.47 (37.3) 2.59 (65.8) In Stock
-32 2 101104 4000 (276) -60 (-51) 200 (392) EP, IP, VAC SodaLime (Fused) 316 Stainless 1.76 (44.7) 3.16 (80.3) In Stock

SAPPHIRE BONDED IN 316SS (Low Pressure)

SAE SIZE
Nominal (in)
J514 ORB
SAE Tube
Size (in)
Part
Number
Pressure
Rating*
(psi/bar)
Min. Operating
Temperature
˚C (˚F)
Max. Operating
Temperature
˚C (˚F)
Internal (IP), External (EP) or Vacuum (VAC) Window
Material
Housing
Material
Clear Aperture
In. (mm)
O.D.
Across
Flats
in. (mm)
Additional Info
-4 1/4 101106 1000 (69) -60 (-51) 200 (392) IP Sapphire (Bonded) 316 Stainless 0.24 (6.1) 0.78 (19.8) In Stock
-6 3/8 101107 1000 (69) -60 (-51) 200 (392) IP Sapphire (Bonded) 316 Stainless 0.33 (8.4) 0.92 (23.4) In Stock
-8 1/2 101108 1000 (69) -60 (-51) 200 (392) IP Sapphire (Bonded) 316 Stainless 0.46 (11.7) 1.14 (29.0) In Stock
-12 3/4 101109 1000 (69) -60 (-51) 200 (392) IP Sapphire (Bonded) 316 Stainless 0.72 (18.3) 1.58 (40.1) In Stock
-16 1 101110 1000 (69) -60 (-51) 200 (392) IP Sapphire (Bonded) 316 Stainless 0.92 (23.4) 1.79 (45.5) In Stock
-20 1-1/4 101111 1000 (69) -60 (-51) 200 (392) IP Sapphire (Bonded) 316 Stainless 1.25 (31.8) 2.30 (58.4) In Stock
-24 1-1/2 101112 1000 (69) -60 (-51) 200 (392) IP Sapphire (Bonded) 316 Stainless 1.41 (35.8) 2.59 (65.8) In Stock
-32 2 101113 1000 (69) -60 (-51) 200 (392) IP Sapphire (Bonded) 316 Stainless 1.86 (47.2) 3.16 (80.3) In Stock

SAPPHIRE BONDED IN 316SS (High Pressure)

SAE SIZE
Nominal (in)
J514 ORB
SAE Tube
Size (in)
Part
Number
Pressure
Rating*
(psi/bar)
Min. Operating
Temperature
˚C (˚F)
Max. Operating
Temperature
˚C (˚F)
Internal (IP), External (EP) or Vacuum (VAC) Window
Material
Housing
Material
Clear Aperture
In. (mm)
O.D.
Across
Flats
in. (mm)
Additional Info
-4 1/4 101114 4000 (276) -60 (-51) 200 (392) IP Sapphire (Bonded) 316 Stainless 0.19 (4.8) 0.78 (19.8) Build To Order
-6 3/8 101115 4000 (276) -60 (-51) 200 (392) IP Sapphire (Bonded) 316 Stainless 0.26 (6.6) 0.92 (23.4) Build To Order
-8 1/2 101116 4000 (276) -60 (-51) 200 (392) IP Sapphire (Bonded) 316 Stainless 0.32 (8.1) 1.14 (29.0) Build To Order
-12 3/4 101117 4000 (276) -60 (-51) 200 (392) IP Sapphire (Bonded) 316 Stainless 0.44 (11.2) 1.58 (40.1) Build To Order
-16 1 101118 4000 (276) -60 (-51) 200 (392) IP Sapphire (Bonded) 316 Stainless 0.70 (17.8) 1.79 (45.5) Build To Order
-20 1-1/4 101119 4000 (276) -60 (-51) 200 (392) IP Sapphire (Bonded) 316 Stainless 0.80 (20.3) 2.30 (58.4) Build To Order
-24 1-1/2 101120 4000 (276) -60 (-51) 200 (392) IP Sapphire (Bonded) 316 Stainless 0.99 (25.1) 2.59 (65.8) Build To Order
-32 2 101121 4000 (276) -60 (-51) 200 (392) IP Sapphire (Bonded) 316 Stainless 1.42 (36.1) 3.16 (80.3) Build To Order

SAE BORO FUSED IN INCONEL (High Pressure)

SAE SIZE
Nominal (in)
J514 ORB
SAE Tube
Size (in)
Part
Number
Pressure
Rating*
(psi/bar)
Min. Operating
Temperature
˚C (˚F)
Max. Operating
Temperature
˚C (˚F)
Internal (IP), External (EP) or Vacuum (VAC) Window
Material
Housing
Material
Clear Aperture
In. (mm)
O.D.
Across
Flats
in. (mm)
Additional Info
-4 1/4 - 4000 (276) -60 (-51) 200 (392) EP, IP, VAC Borosilicate Inconel   0.78 (19.8) Contact Us
-6 3/8 - 4000 (276) -60 (-51) 200 (392) EP, IP, VAC Borosilicate Inconel   0.92 (23.4) Contact Us
-8 1/2 - 4000 (276) -60 (-51) 200 (392) EP, IP, VAC Borosilicate Inconel   1.14 (29.0) Contact Us
-12 3/4 - 4000 (276) -60 (-51) 200 (392) EP, IP, VAC Borosilicate Inconel   1.58 (40.1) Contact Us
-16 1 - 4000 (276) -60 (-51) 200 (392) EP, IP, VAC Borosilicate Inconel   1.79 (45.5) Contact Us
-20 1-1/4 - 4000 (276) -60 (-51) 200 (392) EP, IP, VAC Borosilicate Inconel   2.30 (58.4) Contact Us
-24 1-1/2 - 4000 (276) -60 (-51) 200 (392) EP, IP, VAC Borosilicate Inconel   2.59 (65.8) Contact Us
-32 2 - 4000 (276) -60 (-51) 200 (392) EP, IP, VAC Borosilicate Inconel   3.16 (80.3) Contact Us