缸体沉头孔
cylinder block counterbore
止推垫圈沉头孔面
thrust washer counterbore face
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
沉头带榫螺栓
Flat countersunk nib bolts