Universal joint

A universal joint comprising:

• a socket member defining a first end and a second end opposite the first end and including a receiving hole axially extending inward from the second end along a first reference axis,
• wherein an inner periphery of the receiving hole is formed with a plurality of first evading portions and a plurality of first abutting portions respectively extending linearly along a direction parallel to the first reference axis and staggered with each other to cause the plurality of first abutting portions not connected to each other,
• wherein each of the plurality of first abutting portions is provided with a first abutting face, a second abutting face connected to the first abutting face, and an adjacent edge formed between the first abutting face and the second abutting face and extending along the direction parallel to the first reference axis, and
• wherein one side of the adjacent edge opposite to the first reference axis forms an adjacent edge angle being greater than 177 degrees and less than 180 degrees;
• and
• a driving member axially extending along a second reference axis and having a rounded base arranged in the receiving hole and a driving column opposite to the rounded base.