沉头孔  Counterbore

沉头孔表面  counterbore surface

沉头孔深度  counterbore depth

大直径沉管  large-diameter sinking pipe

缸体沉头孔  cylinder block counterbore

管沉头孔  tube counterbore

履带链节沉头孔  track link counterbore

止推垫圈沉头孔面  thrust washer counterbore face

轴承外圈沉头孔  bearing cup counterbore

测头直径  measuring head diameter

大直径头  Large diameter head

工具头直径  tool diameter

股骨头直径  femoral head diameter; femoral head size

机头直径  drum diameter

结头直径  Knot diameter

截锥头直径铆钉  pan head with parallel neck rivet

进气门头直径  intake valve head diameter

扩孔器与钻头直径之差  shell clearance

埋头直孔  Counterbore