114. 115.116.117 低抗壓強(qiáng)度高可鉆性的及軟地層，如粘土.泥巖.疏松砂巖.
      The bits are used to drill low-compressive strength,soft formations. Long projection tooth lengths are used on high offset cones to provide the greatest penetration rates possible. Wear-resistant hard facing is used to control tooth wear.On the softest bi types this hard facing completely covers the bit teeth            0.35---0.8     

124.125.126.127 低抗壓強(qiáng)度高可鉆性的及軟地層，如泥巖.石膏.鹽巖.軟頁巖.軟石灰?guī)r
     Soft formation with low compressive strength and high drillability. Such as sandstone, anhydrite, salt, shale, limestone.      0.3---0.9 

134.135.136.137 低抗壓強(qiáng)度高可鉆性的及軟至中軟地層，如中軟頁巖.硬石膏.中軟石灰?guī)r.中軟砂巖和有硬夾層的軟地層
       Soft to medium formations with low compressive strength, such as shale, anhydrite, sand and so on for soft formation 0.33--1.0 

216.217 低抗壓強(qiáng)度的軟到中等地層，如中軟頁巖.中軟石灰?guī)r.中軟砂巖.和有硬夾層的軟地層
Soft to medium formations with low compressive strength, such as shale, anhydrite, sand and so on for soft formation 0.4---1.0