American Series Axle Beam/Tube

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American series axle beam/tube:
1). Load: 8T, 11T, 12T, 13T, 14T, 15T, 16T, 20T;
2). Track length: 1850mm;
3). Beam size: Round 127mm, square 120mm, square 127mm, square 150mm;

Remark: Other track length is available.