"轴头主轴端" can be translated as "the spindle end at the shaft head" in English. Here, "轴头" (shaft head) refers to the end part of a shaft, and "主轴端" (spindle end) specifically denotes the end of the main spindle, which is a critical component in machinery for transmitting rotation and power. Combining these terms, we get a description that accurately reflects the original Chinese phrase.