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OwnerMasato Nagawa, Hideki Noda +1inventors
InventorsMasato Nagawa, Hideki Noda, Hiromasa Tanaka
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A bolt according to the invention comprises: a coarse screw thread portion of pitch P, which is formed from the tip end portion of a bolt shank to a prescribed portion; and a fine screw thread portion of pitch p (p=P/n wherein n is an integer of 2 or more), which is formed so as to overlap the coarse screw thread portion for at least the entire length of the coarse screw thread portion of the bolt shank or from the tip end portion to the prescribed portion of the coarse screw thread portion. And, it is an object of the invention to provide a bolt that can be mass-produced at low cost, bring about excellent synchronicity, strength against compression and shear, and an excellent tightening force, and in which a nut screwed therein is scarcely loosened upon receiving a large vibration load.
A bolt comprising:
A method for manufacturing a bolt comprising the steps of:
A method for manufacturing a bolt comprising the step of:
Dependencies are inferred from the claim text.