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NPT Sight Glasses

NPT sight glasses are typical NPT fittings having NPT male threads, where the window is encased into the metal housing forming a single-piece part. Designed up to 7000 psi pressure, these sight glasses have optical clarity suitable for imaging systems and also for looking at oil levels inside pressure vessels, or checking the color of a refrigerant. These NPT sight glasses transmit a broad spectrum of wavelengths, ranging from near-infrared, visible light, to ultraviolet. Sight glasses with quartz use material GE-124 quartz. It's a pure form of silica commonly used in semiconductor equipment. This quartz has high purity for use in a process in semiconductor reactors.

Encole LLC

NPT-Threaded High Pressure Sight Glasses with Quartz Windows, 17-4PH Steel Housing

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Sight windows with NPT threads conforming to ASME B1.20.1. For visual inspection, machine vision, laser sensors, in use with all common hydraulic oils, refrigerants, pharmaceutical processing equipment. This sight glass is an ideal choice for applications requiring no compromises in optical clarity. The window is flat on both sides, and precisely polished to surface quality of 40-20 S-D per MIL-O-13830.
Aperture Dia. Thread Max Operating Temp. Housing Material Max Operating Pressure Window Material Mfg P/N Encole P/N Price
0.35 inch NPT 3/8 65 C 17-4PH 6170 psi Quartz 100765 769E701 $ 408.00 each
0.40 inch NPT 1/2 60 C 17-4PH 6170 psi Quartz 100766 769E702 $ 426.04 each
0.55 inch NPT 3/4 55 C 17-4PH 6170 psi Quartz 100767 769E703 RFQ
0.75 inch NPT 1 45 C 17-4PH 6170 psi Quartz 100768 769E704 $ 435.90 each
1.01 inch NPT 1-1/4 40 C 17-4PH 6170 psi Quartz 100769 769E705 RFQ
1.22 inch NPT 1-1/2 40 C 17-4PH 6170 psi Quartz 100770 769E706 $ 697.58 each
1.61 inch NPT 2 35 C 17-4PH 6170 psi Quartz 100771 769E707 RFQ

Metaglas, Herberts Industrieglas GmbH & Co. KG

Fused NPT Sight Glasses, Duplex Steel 2205, Sodalime, Full Glass Height

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Glass is flush with both ends of the housing. Sides of the glass are flat and polished to approximately S-D: 80-40, which is an optical finish of a typical room window. This optical clarity is suitable for undistorted viewing through the sight glass. For visual inspection, machine vision, optical sensors, in use with all common hydraulic oils, refrigeration, water heaters, and compressed air applications. Connections are NPT or NPTF (Dryseal) threads conforming to ASME B1.20.1.
Aperture Dia. Thread Max Operating Temp. Max Operating Pressure Housing Material Window Material Mfg P/N Encole P/N Price
5 mm NPT 1/4 150 C 100 bar Duplex 2205 Soda lime Met-62-025S 774E1601 $ 214.08 each
5 mm NPTF 1/4 150 C 100 bar Duplex 2205 Soda lime Met-62F-025S 774E1602 $ 219.80 each
7 mm NPT 3/8 150 C 100 bar Duplex 2205 Soda lime Met-62-038S 774E1603 $ 231.05 each
7 mm NPTF 3/8 150 C 100 bar Duplex 2205 Soda lime Met-62F-038S 774E1604 $ 254.60 each
11 mm NPT 1/2 150 C 100 bar Duplex 2205 Soda lime Met-62-050S 774E1605 $ 248.12 each
11 mm NPTF 1/2 150 C 100 bar Duplex 2205 Soda lime Met-62F-050S 774E1606 $ 268.90 each
19 mm NPT 3/4 150 C 100 bar Duplex 2205 Soda lime Met-62-075S 774E1607 $ 262.12 each
19 mm NPTF 3/4 150 C 100 bar Duplex 2205 Soda lime Met-62F-075S 774E1608 $ 290.52 each
17 mm NPT 1 150 C 100 bar Duplex 2205 Soda lime Met-62-100S 774E1609 $ 283.15 each
17 mm NPTF 1 150 C 100 bar Duplex 2205 Soda lime Met-62F-100S 774E16010 $ 302.90 each
22 mm NPT 1-1/4 150 C 100 bar Duplex 2205 Soda lime Met-62-125S 774E16011 $ 288.05 each
22 mm NPTF 1-1/4 150 C 100 bar Duplex 2205 Soda lime Met-62F-125S 774E16012 $ 315.64 each
25 mm NPT 1-1/2 150 C 100 bar Duplex 2205 Soda lime Met-62-150S 774E16013 $ 299.25 each
25 mm NPTF 1-1/2 150 C 100 bar Duplex 2205 Soda lime Met-62F-150S 774E16014 $ 342.50 each
35 mm NPT 2 150 C 100 bar Duplex 2205 Soda lime Met-62-200S 774E16015 $ 381.23 each
35 mm NPTF 2 150 C 100 bar Duplex 2205 Soda lime Met-62F-200S 774E16016 $ 429.80 each

Oil-Rite Corporation

Stainless Steel Gasketed Glass Sights with NPT Threads

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303 Stainless Steel Gasketed Glass Sight for visual observation of liquid levels and condition. This sight glass is typically used in any application where oil or fluid inspection is essential. The housing is a 303 Stainless Steel fitting with U.S. standard NPT threads conforming to ASME B1.20.1.
Aperture Dia. Thread Max Operating Pressure Max Operating Temp. Housing Material Window Material Mfg P/N Encole P/N Price
0.312 inch NPT 1/4 125 psi 225 F AISI 303 Soda lime B4763-01B 776E801 $ 59.26 per package of 2
0.470 inch NPT 3/8 125 psi 225 F AISI 303 Soda lime B4763-02B 776E802 $ 65.32 per package of 2
0.594 inch NPT 1/2 125 psi 225 F AISI 303 Soda lime B4763-03B 776E803 $ 77.32 per package of 2
0.781 inch NPT 3/4 125 psi 225 F AISI 303 Soda lime B4763-04B 776E804 $ 85.32 per package of 2
1.000 inch NPT 1 100 psi 225 F AISI 303 Soda lime B4763-05B 776E805 $ 93.78 each
1.531 inch NPT 1-1/4 75 psi 225 F AISI 303 Soda lime B4763-06B 776E806 $ 61.90 each
1.593 inch NPT 1-1/2 50 psi 225 F AISI 303 Soda lime B4763-07B 776E807 $ 72.67 each
1.970 inch NPT 2 50 psi 225 F AISI 303 Soda lime B4763-08B 776E808 $ 86.75 each

Metaglas, Herberts Industrieglas GmbH & Co. KG

NPT-Threaded Fused Sight Glasses, Borosilicate Windows

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Metaglas fused sight glasses for use with all common hydraulic oils, refrigeration, water heaters, and compressed air applications. Fusing glass to metal creates a strong, hermetically sealed single-piece part. These sight windows have NPT threads conforming to ASME B1.20.1.
Aperture Dia. Thread Housing Material Max Operating Temp. Max Operating Pressure Window Material Mfg P/N Encole P/N Price
9 mm NPT 1/4 Hastelloy C-22 300 C 100 bar Borosilicate Met-61-025H 770E3601 $ 287.54 each
9 mm NPTF 1/4 Hastelloy C-22 300 C 100 bar Borosilicate Met-61-F-025H 770E3602 $ 352.60 each
10 mm NPT 3/8 Hastelloy C-22 300 C 100 bar Borosilicate Met-61-038H 770E3603 $ 333.95 each
10 mm NPTF 3/8 Hastelloy C-22 300 C 100 bar Borosilicate Met-61-F-038H 770E3604 $ 375.60 each
14 mm NPT 1/2 Hastelloy C-22 300 C 100 bar Borosilicate Met-61-050H 770E3605 $ 378.50 each
14 mm NPTF 1/2 Hastelloy C-22 300 C 100 bar Borosilicate Met-61-F-050H 770E3606 $ 415.25 each
18 mm NPT 3/4 Hastelloy C-22 300 C 100 bar Borosilicate Met-61-075H 770E3607 $ 435.90 each
18 mm NPTF 3/4 Hastelloy C-22 300 C 100 bar Borosilicate Met-61-F-075H 770E3608 $ 465.30 each
22 mm NPT 1 Hastelloy C-22 300 C 100 bar Borosilicate Met-61-100H 770E3609 $ 540.00 each
22 mm NPTF 1 Hastelloy C-22 300 C 100 bar Borosilicate Met-61-F-100H 770E36010 $ 587.20 each
25 mm NPT 1-1/4 Hastelloy C-22 300 C 100 bar Borosilicate Met-61-125H 770E36011 $ 622.00 each
25 mm NPTF 1-1/4 Hastelloy C-22 300 C 100 bar Borosilicate Met-61-F-125H 770E36012 $ 675.20 each
30 mm NPT 1-1/2 Hastelloy C-22 300 C 100 bar Borosilicate Met-61-150H 770E36013 $ 712.00 each
30 mm NPTF 1-1/2 Hastelloy C-22 300 C 100 bar Borosilicate Met-61-F-150H 770E36014 $ 768.90 each
37 mm NPT 2 Hastelloy C-22 300 C 100 bar Borosilicate Met-61-200H 770E36015 $ 1370.00 each
37 mm NPTF 2 Hastelloy C-22 300 C 100 bar Borosilicate Met-61-F-200H 770E36016 $ 1410.80 each
55 mm NPT 3 Hastelloy C-22 300 C 100 bar Borosilicate Met-61-300H 770E36017 $ 2321.00 each
55 mm NPTF 3 Hastelloy C-22 300 C 100 bar Borosilicate Met-61-F-300H 770E36018 $ 2482.50 each
9 mm NPT 1/4 Duplex 2205 280 C 100 bar Borosilicate Met-61-025S 770E36019 $ 181.27 each
9 mm NPTF 1/4 Duplex 2205 280 C 100 bar Borosilicate Met-61-F-025S 770E36020 $ 187.90 each
10 mm NPT 3/8 Duplex 2205 280 C 100 bar Borosilicate Met-61-038S 770E36021 $ 189.55 each
10 mm NPTF 3/8 Duplex 2205 280 C 100 bar Borosilicate Met-61-F-038S 770E36022 $ 195.60 each
14 mm NPT 1/2 Duplex 2205 280 C 100 bar Borosilicate Met-61-050S 770E36023 $ 198.32 each
14 mm NPTF 1/2 Duplex 2205 280 C 100 bar Borosilicate Met-61-F-050S 770E36024 $ 216.27 each
18 mm NPT 3/4 Duplex 2205 280 C 100 bar Borosilicate Met-61-075S 770E36025 $ 209.24 each
18 mm NPTF 3/4 Duplex 2205 280 C 100 bar Borosilicate Met-61-F-075S 770E36026 $ 231.50 each
22 mm NPT 1 Duplex 2205 280 C 100 bar Borosilicate Met-61-100S 770E36027 $ 218.53 each
22 mm NPTF 1 Duplex 2205 280 C 100 bar Borosilicate Met-61-F-100S 770E36028 $ 242.80 each
25 mm NPT 1-1/4 Duplex 2205 280 C 100 bar Borosilicate Met-61-125S 770E36029 $ 288.89 each
25 mm NPTF 1-1/4 Duplex 2205 280 C 100 bar Borosilicate Met-61-F-125S 770E36030 $ 297.60 each
30 mm NPT 1-1/2 Duplex 2205 280 C 100 bar Borosilicate Met-61-150S 770E36031 $ 291.08 each
30 mm NPTF 1-1/2 Duplex 2205 280 C 100 bar Borosilicate Met-61-F-150S 770E36032 $ 309.70 each
37 mm NPT 2 Duplex 2205 280 C 100 bar Borosilicate Met-61-200S 770E36033 $ 386.59 each
37 mm NPTF 2 Duplex 2205 280 C 100 bar Borosilicate Met-61-F-200S 770E36034 $ 398.65 each
55 mm NPT 3 Duplex 2205 280 C 100 bar Borosilicate Met-61-300S 770E36035 $ 496.94 each
55 mm NPTF 3 Duplex 2205 280 C 100 bar Borosilicate Met-61-F-300S 770E36036 $ 532.80 each

Oil-Rite Corporation

Low Cost Fused NPT-Threaded Sight Glasses, Zinc-Plated Carbon Steel

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Sodalime glass is fused to a plain carbon steel body which is Zinc-plated for added corrosion resistance. These sight glasses are an ideal budget choice for visual observation of liquid levels and their colors, present or absence of refrigerant, oil levels in a compressor. Applications include hydraulic systems with mineral oils, diesel, and other common liquids where low cost is required. Not suitable for cycling high temperature, high pressure or aggressively corrosive applications.
Aperture Dia. Thread Max Operating Temp. Max Operating Pressure Housing Material Window Material Mfg P/N Encole P/N Price
0.340 inch NPT 1/4 130 F 125 psi Carbon Steel Zinc-Plated Soda lime A2890-1 775E801 $ 53.25 per package of 3
0.560 inch NPT 1/2 130 F 125 psi Carbon Steel Zinc-Plated Soda lime A2890-3 775E802 $ 68.90 per package of 3
0.940 inch NPT 1 130 F 125 psi Carbon Steel Zinc-Plated Soda lime A2890-5 775E803 $ 58.79 per package of 2
1.190 inch NPT 1-1/4 130 F 125 psi Carbon Steel Zinc-Plated Soda lime A2890-6 775E804 $ 75.45 per package of 2
1.440 inch NPT 1-1/2 130 F 125 psi Carbon Steel Zinc-Plated Soda lime A2890-7 775E805 $ 31.90 each
1.880 inch NPT 2 130 F 125 psi Carbon Steel Zinc-Plated Soda lime A2890-8 775E806 $ 38.75 each
0.440 inch NPTF 3/8 130 F 125 psi Carbon Steel Zinc-Plated Soda lime A2890-2 775E807 $ 68.80 per package of 2
0.750 inch NPTF 3/4 130 F 125 psi Carbon Steel Zinc-Plated Soda lime A2890-4 775E808 $ 74.24 per package of 2

Oil-Rite Corporation

Reflector Sight Glass in Stainless Steel, Gasketed, NPT Threads

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Reflector behind the glass helps see oil levels, presence of liquids, color, quality of a fluid. 303 Stainless Steel Gasketed Glass Sight for visual observation of liquid levels and their condition. These sight glasses are typically used in any application where oil or fluid inspection is essential. The housing is a 303 Stainless Steel fitting with U.S. standard NPT threads conforming to ASME B1.20.1. Use traditional installation tools and Teflon tape or pipe sealant. These sight glasses have a Buna-N internal seal for good chemical compatibility with Petroleum oils and fluids; Cold Water; Silicone greases and oils; Dibasic Acid Ester (Diester) based lubricants (MIL-L-7808); Ethylene glycol base fluids (Hydrolubes). Not Recommended for: Halogenated hydrocarbons (carbon tetrachloride, trichloroethylene); Nitro hydrocarbons (nitrobenzene, aniline); Phosphate ester hydraulic fluids (Skydrol, Fyrquel, Pydraul); Ketones (MEK, acetone); Strong Acids Ozone; Automotive brake fluid.
Aperture Dia. Thread Max Operating Pressure Max Operating Temp. Housing Material Window Material Mfg P/N Encole P/N Price
0.470 inch NPT 3/8 125 psi 225 F AISI 303 Soda lime B4763-12B 777E701 $ 71.32 per package of 2
0.594 inch NPT 1/2 125 psi 225 F AISI 303 Soda lime B4763-13B 777E702 $ 81.32 per package of 2
0.781 inch NPT 3/4 125 psi 225 F AISI 303 Soda lime B4763-14B 777E703 $ 93.32 per package of 2
1.000 inch NPT 1 100 psi 225 F AISI 303 Soda lime B4763-15B 777E704 $ 95.32 per package of 2
1.531 inch NPT 1-1/4 75 psi 225 F AISI 303 Soda lime B4763-16B 777E705 $ 64.67 each
1.593 inch NPT 1-1/2 50 psi 225 F AISI 303 Soda lime B4763-17B 777E706 $ 74.85 each
1.970 inch NPT 2 50 psi 225 F AISI 303 Soda lime B4763-18B 777E707 $ 89.65 each

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