Miscellaneous articles, products and parts of ship's appliances: ship's round portholes

Purpose: closing of openings on ships and watercrafts. Designed to provide the necessary view from the premises, and to allow light and air to enter the rooms in which they are installed.
Types: water-gas-tight heavy, normal, lightweight.
Types: inboard (blind and casement), universal.
Design: with storm cover, without storm cover; with and without fence.
Design features:
Dimensions (diameter in light): min Ø200 mah Ø450 mm; Glass thickness from 8 mm to 19 mm.
Method of fastening: by bolts, welding.
Climatic version OM, category I according to GOST 15150: ambient temperature from minus 40? to plus 45?.
Main material: aluminium alloy.