The Transducer Mounting Hole Machining Tool Kit contains all the necessary drills and taps to prepare a standard 1/2-20 UNF transducer mounting hole. The kit contains the special pilot drill required to machine the 45 degree seat. All tools included in this kit are made of premium grade, high strength tool steel. the specific parts of the kit are: 29/64 pilot drill; 9/32 drill (.281); 5/16 reamer (.3125); 1/2-20 UNF GH5 tap; 1/2-20 UNF GH5 bottoming tap; 17/32 drill (.531).
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