Steel & O'Brien® Bolt Style Sight Glass

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Part NumberSize (inches)Length
54BMP-1.51 1/25.875
54BMP-2.52 1/26.375

Manufactured in Arcade, NY. Composed of borosilicate glass and sealed with buna gaskets. Various end configurations are available: clamp, bevel seat, I-line, Q-line and John Perry. Steel & O’Brien offers many styles of sight glasses including bolt style and socket head cap screw style. Bolt style sight glasses can also be supplied with a protective acrylic shield to prevent breakages of the glass from inadvertent contact.


* Wide range of viewport materials are available including: acrylic and polycarbonate. * Other gasket materials also available (PTFE not recommended). * Ratings depend on related components in the system, absence of thermal shock, proper expansion of ferrules, assembly of joints, and installation. NOTE: Drawing, part numbers and dimensions shown are for bolt style clamp end sight glass. Call Steel & O’Brien for details on other configurations

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