Rack system and slide rail assemblies thereof

A slide rail assembly, comprising:

• a first rail having a first channel;
• a second rail displaceable with respect to the first rail;
• a third rail movably provided between the first channel of the first rail and the second rail;
• and
• an extension member connected to the first rail, the extension member having a surface lying substantially in a same plane as an outer surface of the third rail.

A slide rail assembly, comprising:

• a first rail including a first channel;
• a second rail displaceable with respect to the first rail;
• a third rail movably provided between the first channel of the first rail and the second rail, the third rail including a second channel;
• and
• an extension member connected to the first rail, the extension member having a thickness not greater than a width of the second channel of the third rail.

A slide rail assembly to be mounted with a chassis, the slide rail assembly comprising:

• a first rail;
• and
• a second rail displaceable with respect to the first rail, the second rail including a first feature and a second feature different from the first feature;
• wherein the chassis includes a first mounting feature and a second mounting feature to be mounted respectively to the first feature and the second feature of the second rail.

A slide rail assembly adapted to be mounted to a rack, the slide rail assembly comprising:

• a first rail including a first channel;
• a second rail displaceable with respect to the first rail;
• a third rail movably provided between the first channel of the first rail and the second rail, the third rail including a second channel;
• and
• an extension member connected to the rack.