| 摘要 |
A method is disclosed for making a trailer ball. The method includes a step of providing a block, a step of spheroidizing graphite in the block, a step of cold forging the block into a trailer ball. The trailer ball includes a disc, a ball formed on a side of the disc, a non-circular neck formed on an opposite side of the disc and a bolt extended from the non-circular neck. The bolt is tapped with a thread.
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