CARL H. Robertson Mfg. This invention relates to screws of the type which are adapted to be threaded into untapped holes, and the object of the invention is to provide a screw which can be driven into untapped holes with greater facility and less driving torque than previous screws of this type. Another important object is to provide a screw as aforesaid which can be driven with a minimum requirement of driving torque into a blind hole provided for example, in structural and lower carbon content steel members, zinc or aluminum die castings, or brass or bronze forgings or the like, and which will swage form a thread formation on the wall of the untapped holewithout chipping of the wall surface so that the screw can be run clear to the bottom of the hole. Still another and important object is to provide a screw as aforesaid which will be self-locking against removal unless deliberately removed with a driver. In this connection, one important application of the invention is to provide a screw for holding two members together without requiring the use of a nut, the screw passing through a clearance hole in the upper member and entering an untapped hole in the lower member to swage form threads therein in a manner to provide a self-locking action.
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US3357295A - Self-tapping screws - Google PatentsVIDEO ON THE TOPIC: How to Install a Self-Tapping Sheet Metal Screw
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The invention relates to a self-tapping screw having a large ratio between the outside diameter and the core diameter, a small thread angle and a small ratio between the outside diameter and pitch of the threads. Screws of this type provide a good securement in soft material, in particular also in particle boards, because of the large bearing depth, which results from the large ratio between the outside diameter and core diameter, namely, the threads are very high in relationship to the diameter of the screw. Because of the relatively large pitch small relationship between outside diameter and axial spacing of the threads much space remains between the threads, so that the material into which the screw is rotated can engage with relatively large cross sections between the threads. A good cutting action of the threads and a large free space between two adjacent threads is achieved through the small thread angle. However, screws of this type can also be screwed into sheet metal which is not very thick and self-tap grooves therein, into which are received the threads. One can hardly speak of a complete thread in this case.
US4544313A - Self-tapping screw - Google Patents
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These are mostly manufactured from H. These are used for fastening of two or more sheet metal parts. Self Tapping Screw is headed and externally threaded, possessing capabilities which permit it to insert into hole and forming its own thread, when being tightened. Per annum. This product is having potential both in domestic and international markets. As the demand of this item is increasing many new units are coming up. The sequence of operation are : 1. Making of head, on header machine. Slotting of head, on slotting machine. Rolling of thread, on thread rolling machine.
And for perfect timing, the air conditioner unit has decided not to function properly. A quick inspection of the air conditioning unit shows many different parts, including sheets of thin metal and specific screws inserted in them. What are these screws and why are they a good fit here?
Affix Pozi Pan Head Self-Tapping Screws No.4 9.5mm - Pack Of 100
Suppliers of Tapping screws, hexalobular socket pan head
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Hexagon head self tapping screw in stainless steel In compliance with the standard DIN K. Available in different dimensions. Download Technical Sheet.
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