沉头孔表面  counterbore surface

沉头孔深度  counterbore depth

沉头孔直径  counterbore diameter

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

沉头钻孔  Counterbore

开孔沉箱码头  Open-caisson Wharf

半沉头不脱出螺钉  oval slotted countersunk head unloosing screw

半沉头机器螺钉  oval countersunk fillister head machine screw

半沉头螺钉  raised countersunk head screw; oval head screw

半沉头铆钉  Oval countersunk head rivets; Oval countersunk head rivets--Black; oval countersunk head rivet

半沉头木螺钉  oval countersunk fillister head wood screw

半圆沉头螺栓  half round countersunk head bolt

沉孔  Counterbore

沉头  countersunk head

沉头带榫螺栓  Flat countersunk nib bolts