![]() Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Application filed by OSG Corp filed Critical OSG Corp Assigned to OSG CORPORATION reassignment OSG CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Original Assignee OSG Corp Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) ( en Inventor Kazumitsu Harada Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Granted Application number US16/486,305 Other versions US11110531B2 Fine threads are recommended if two or more full thread engagements must be above the cutting slot, but the material is not thick enough to allow two full threads of coarse threads.- Google Patents US20200230727A1 - Thread forming tapĭownload PDF Info Publication number US20200230727A1 US20200230727A1 US16/486,305 US201716486305A US2020230727A1 US 20200230727 A1 US20200230727 A1 US 20200230727A1 US 201716486305 A US201716486305 A US 201716486305A US 2020230727 A1 US2020230727 A1 US 2020230727A1 Authority US United States Prior art keywords thread root forming tap lead ridge Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Coarse threads should be used with weak materials. ![]() Tapping screws are available with either coarse or fine threads. Tapping screws are used in steel, aluminum, die-castings, cast iron, forgings, plastics, reinforced plastics, and resin-impregnated plywood. Taping screws are usually case hardened and have tensile strengths of at least 100,000 psi with relatively high ultimate torsional strengths. The close fit usually keeps the screws tight even when subject to vibrations. Mating threads created by these tapping screws fit the screw threads closely, and no clearance is needed. In general, tapping screws permit rapid insertion because nuts are not used and access is required from only one side of the joint. The screws are used in materials where disruptive internal stresses are not wanted, or when it takes to too much driving torque to use thread-forming screws. The screws’ cutting action means torque needed for insertion is low. Thread-tapping screws have cutting edges and chip cavities that create a mating thread by removing material from the part they are driven into. ![]() They usually do not need lockwashers or other types of locking devices to prevent loosening. Because no material is removed, the mating part creates a fit with zero clearance. These screws generally are used when large stresses are needed to increase resistance to loosening. The thread-forming screw displaced material around the pilot hole so that it flows around the screw’s threads. There are two basic types: thread forming and thread cutting. Tapping screws form mating threads in materials they are driven into.
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