螺纹底径 bottom diameter of thread ; core diameter of thread ; thread root diameter
纸桶底径 Paper bucket bottom diameter
底部直径 base diameter ; Bottom Diameter ; Bottom dia
扩底直径 bell out diameter
底径递增量 Bottom diameter progressive increment
断屑槽底半径 chip breaker groove radius ; chellop breaker groove radius
沟底半径 radius of flute
底盘直径 CHASSIS DIAMETER ; Base diameter ; cm ; Diameter of the pad holding
轴颈及花键底径的硬化层深度为（0。
When hardened layer depths of axle neck and spline bottom diameter is(0.
注1设计时，请注意使两个轴端不超过丝杠轴底径。
Note 1 the diameter of the Screw Shaft both ends must be less than the Screw Shaft Root diameter.
注：1。底径用于偶数齿，卡尺测量直径用于奇数齿。
NOTES: 1. Bottom diameter for even number of teeth, Caliper diameter for odd number of teeth.
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