Drilling Bits -Mother Hubbard, California, and Regular  Pattern    Catalog Home

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     The mother hubbard bit is characterized by the sharp shoulder just below the wrench square, which makes it easy to remove the drill from the hole when the mud from drilling of shale has built up on the sides of the hole above the drill. These shoulders act as reaming edges and the bit comes out with comparative ease.

Mother Hubbard Bit

      The california pattern bit has a ling shank tapering to round shoulders and has a deep wide water course. It is the standard bit for drilling 8” and larger diameter holes in hard formations such as sandstones or limestones. For drilling ahead of casing, the California pattern bit is also preferred because the sloping shoulders do not catch on the shoe or bottom of casing.

California Pattern Bit

 

     The regular pattern bit is made in sizes 6 5/8” and smaller. The collar diameter is only slightly smaller than the body section ad does not have the square shoulders of the Mother Hubbard or the tapered shoulders of the California Pattern Bit.

Regular Pattern Bit

Approximate Weight & Length Table
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