British Whitworth Threaded Sight Glasses | Encole
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British Whitworth Threaded Sight Glasses

Sight glasses with parallel or tapered threads conforming to the British Whitworth form. Parallel threads are abbreviated as BSPP and designated as G-threads. Taper threads are denoted as BSPT, or R-threads. British Whitworth threadform differs from the US Standard NPT threads in two ways: the tooth angle and the shape of its roots and tips. Specifically, NPT thread has a 60-degree tooth profile, while BSW has 55 degrees. Roots and crests are rounded instead of flat as in NPT. These two differences have little practical advantages or disadvantages over NPT. Taper angle 1.79 is common between the two types. BSW and NPT fittings are not interchangeable. One cannot fit into a mating part having the other type of threads.

Metaglas, Herberts Industrieglas GmbH & Co. KG

BSPP-Threaded Sight Glasses, Borosilicate Fused to Metal Housing

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Sight windows with British Whitworth threads sealing with an O-ring. Female connection port conforming to DIN 3852 Type F. The threadform follows the British Standard Whitworth standard. The thread is parallel (as opposed to taper BSPT), has a 55° tooth angle, with rounded roots and crests. For visual inspection, machine vision, optical sensors, in use with all common hydraulic oils, refrigeration, water heaters, and compressed air applications.
Thread Aperture Dia. Housing Material Max Operating Temp. Max Operating Pressure Window Material Mfg P/N Encole P/N Price
G 3/8” 12 mm Hastelloy C-276 300 C 50 bar Borosilicate Met-61-G-038H 785E1601 $ 406.78 each
G 1/2” 13 mm Hastelloy C-276 300 C 50 bar Borosilicate Met-61-G-050H 785E1602 $ 468.95 each
G 3/4” 16 mm Hastelloy C-276 300 C 50 bar Borosilicate Met-61-G-075H 785E1603 $ 526.12 each
G 1” 22 mm Hastelloy C-276 300 C 50 bar Borosilicate Met-61-G-100H 785E1604 $ 549.73 each
G 1-1/4” 25 mm Hastelloy C-276 300 C 50 bar Borosilicate Met-61-G-125H 785E1605 $ 587.42 each
G 1-1/2” 28 mm Hastelloy C-276 300 C 50 bar Borosilicate Met-61-G-150H 785E1606 $ 662.49 each
G 2” 35 mm Hastelloy C-276 300 C 50 bar Borosilicate Met-61-G-200H 785E1607 $ 712.88 each
G 2-1/2” 50 mm Hastelloy C-276 300 C 50 bar Borosilicate Met-61-G-250H 785E1608 $ 772.55 each
G 3/8” 12 mm Duplex 2205 280 C 50 bar Borosilicate Met-61-G-038S 785E1609 $ 185.52 each
G 1/2” 13 mm Duplex 2205 280 C 50 bar Borosilicate Met-61-G-050S 785E16010 $ 203.98 each
G 3/4” 16 mm Duplex 2205 280 C 50 bar Borosilicate Met-61-G-075S 785E16011 $ 218.75 each
G 1” 22 mm Duplex 2205 280 C 50 bar Borosilicate Met-61-G-100S 785E16012 $ 231.55 each
G 1-1/4” 25 mm Duplex 2205 280 C 50 bar Borosilicate Met-61-G-125S 785E16013 $ 273.60 each
G 1-1/2” 28 mm Duplex 2205 280 C 50 bar Borosilicate Met-61-G-150S 785E16014 $ 284.00 each
G 2” 35 mm Duplex 2205 280 C 50 bar Borosilicate Met-61-G-200S 785E16015 $ 363.20 each
G 2-1/2” 50 mm Duplex 2205 280 C 50 bar Borosilicate Met-61-G-250S 785E16016 $ 392.95 each

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