帮助理解下,多谢!? maximum permissible hardness is rockwell c35 immediately under thread roots and shall be taken on a flat area at least 3,5 mm across, prepared by removing threads; no more material than necessary shall be removed to prepare the flat area. 丝牙底部最高允许硬度直接达到洛氏c35,移去丝牙准备的至少3,5 mm 范围的平坦区域,应在此区域测得硬度,没有必要的材料不移除螺丝牙制备平坦区域。查看更多