Types of Rack Rail
In the USA, the commonly used form of rack rail is called Imperial rack rail. Imperial rack rail has round holes tapped for 10/32 UNF screws. In Europe, the common form of rack rail is full-hole rack strip which has square holes for M6 captive nuts.
In both cases, rack screws and washers are required to mount rack mount equipment to the rack rail. The size and strength of rack rail is determined by its application. Increased thickness of steel results in stronger rack rail and varieties of rack rail can be found such as double angle and single angle rack rail.
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