NPT Sight Window: Sapphire Bonded into 316 Stainless Housing
 
  • Housing Material: 316 Stainless
  • Window Material: Sapphire C-Axis optical grade
  • Temperature operating range: 0 Kelvin to 200C
  • Pressure safety factor: Minimum 2x
  • Abrasion resistance and strength: Excellent, second only to diamond
  • Optical transmission: Deep UV thru visible to far-IR
  • Leak Rate: Ultra-high vacuum rated
  • Chemical resistance: Excellent but must be tested for specific chemicals

Rayotek’s 316 stainless steel/sapphire bonded NPT Sight Windows are rugged, optical grade Sight Windows. Using proprietary adhesive bonding systems, Rayotek seals C-axis sapphire windows into stainless steel housings for a clean, high strength, scratch resistant Sight Window. Our sapphire Sight Glasses are designed for industrial to high tech applications such as laser measuring, spectroscopy, petroleum exploration and particle analysis.

In addition, sapphire has a wide transmission spectrum from approximately 170nm to 6 microns, allowing for UV and IR viewing, inspection and microscopy.


Click on Part Number for Drawings, Purchase & Volume Pricing.

NPT PIPE SIZE
(in)
CLEAR APERTURE
(in)
CLEAR APERTURE (mm)
MAX PRESSURE (psi/bar)
EXTERNAL INTERNAL VACUUM
HEX SIZE (in)
HEX SIZE (mm)
PART NUMBER
1/4 NPT
0.31
7.9
1000/69
EP, VAC
0.69
17.5
 3/8 NPT
0.40
10.2
1000/69
EP, VAC
0.81
20.6
 1/2 NPT
0.51
13.0
1000/69
EP, VAC
1.00
25.4
 3/4 NPT
0.73
18.5
1000/69
EP, VAC
1.38
35.1
1 NPT
0.88
22.4
1000/69
EP, VAC
1.63
41.4
1 1/4 NPT
1.24
31.5
1000/69
EP, VAC
2.00
50.8
1 1/2 NPT
1.38
35.1
1000/69
EP, VAC
2.25
57.2
2 NPT
1.66
42.2
1000/69
EP, VAC
2.75
69.9
2 1/2 NPT
2.10
53.3
1000/69
EP, VAC
3.50
88.9
3 NPT
2.38
60.5
1000/69
EP, VAC
4.00
101.6
4 NPT
2.94
74.7
1000/69
EP, VAC
4.75
120.7
 
 
 
 
 
 
 
 
1/4 NPT
0.31
7.9
1000/69
IP
0.69
17.5
 3/8 NPT
0.40
10.2
1000/69
IP
0.81
20.6
 1/2 NPT
0.51
13.0
1000/69
IP
1.00
25.4
 3/4 NPT
0.73
18.5
1000/69
IP
1.38
35.1
1 NPT
0.88
22.4
1000/69
IP
1.63
41.4
1 1/4 NPT
1.24
31.5
1000/69
IP
2.00
50.8
1 1/2 NPT
1.38
35.1
1000/69
IP
2.25
57.2
2 NPT
1.66
42.2
1000/69
IP
2.75
69.9
2 1/2 NPT
2.10
53.3
1000/69
IP
3.50
88.9
3 NPT
2.38
60.5
1000/69
IP
4.00
101.6
4 NPT
2.94
74.7
1000/69
IP
4.75
120.7
 
 
 
 
 
 
 
 
1/4 NPT
0.26
6.6
4000/276
EP, VAC
0.69
17.5
 3/8 NPT
0.33
8.4
4000/276
EP, VAC
0.81
20.6
 1/2 NPT
0.34
8.6
4000/276
EP, VAC
1.00
25.4
 3/4 NPT
0.42
10.7
4000/276
EP, VAC
1.38
35.1
1 NPT 
0.61
15.5
4000/276
EP, VAC
1.63
41.4
1 1/4 NPT
0.78
19.8
4000/276
EP, VAC
2.00
50.8
1 1/2 NPT
0.93
23.6
4000/276
EP, VAC
2.25
57.2
2 NPT
1.22
31.0
4000/276
EP, VAC
2.75
69.9
2 1/2 NPT
1.66
42.2
4000/276
EP, VAC
3.50
88.9
3 NPT
1.89
48.0
4000/276
EP, VAC
4.00
101.6
4 NPT
2.60
66.0
4000/276
EP, VAC
4.75
120.7
 
 
 
 
 
 
 
 
1/4 NPT
0.26
6.6
4000/276
IP
0.69
17.5
 3/8 NPT
0.33
8.4
4000/276
IP
0.81
20.6
 1/2 NPT
0.34
8.6
4000/276
IP
1.00
25.4
 3/4 NPT
0.42
10.7
4000/276
IP
1.38
35.1
1 NPT
0.61
15.5
4000/276
IP
1.63
41.4
1 1/4 NPT
0.78
19.8
4000/276
IP
2.00
50.8
1 1/2 NPT
0.93
23.6
4000/276
IP
2.25
57.2
2 NPT
1.22
31.0
4000/276
IP
2.75
69.9
2 1/2 NPT
1.66
42.2
4000/276
IP
3.50
88.9
3 NPT
1.89
48.0
4000/276
IP
4.00
101.6
4 NPT
2.60
66.0
4000/276
IP
4.75
120.7


Contact Rayotek Sales for higher volume price discounts and UHP (10,000PSI or higher) sapphire Sight Windows.

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