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2. Self-tapping screw - Wikipedia

   en.wikipedia.org/wiki/Self-tapping_screw

   A self-tapping screw is a screw that can tap its own hole as it is driven into the material. More narrowly, self-tapping is used only to describe a specific type of thread-cutting screw intended to produce a thread in relatively soft material or sheet materials, excluding wood screws .

3. What to Shop During Lowe’s Black Friday Every Day Sale - AOL

   www.aol.com/shop-during-lowe-black-friday...

   Whether you’re looking for new tools and yard equipment or new decor and appliances for your home, Lowe’s Black Friday Every Day sale can help you save.

4. Robertson screw - Wikipedia

   en.wikipedia.org/wiki/Robertson_screw

   Robertson screwdrivers are easy to use one-handed, because the tapered socket tends to retain the screw, even if it is shaken. [3]: 85–86 They also allow the use of angled screwdrivers and trim-head screws. The socket-headed Robertson screws are self-centering and reduce cam out. They also stop a power tool when set, and can be more easily ...

5. List of screw and bolt types - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_and_bolt_types

   The screw itself should be drilled a minimum of 1" into the concrete to hold effectively and a maximum of 1-3/4" or the threads will wear and will lose holding power. Ideally 1-1/4" to 1-1/2" of screw thread in the concrete. [1] So for example, if a 1/2" board is being screwed onto the concrete, a 1-3/4" to 2" concrete screw should be used ...

6. Self unloading trailer - Wikipedia

   en.wikipedia.org/wiki/Self_unloading_trailer

   Originally designed by Trinity Trailer Mfg., Inc.® in 1974, the EagleBridge is a self-unloading belt trailer. A belt trailer or self unloading belt trailer is a semi-trailer that uses either a chain and flap assembly or a continuous belt that runs lengthwise on the bottom of the trailer. The belt is bolted to bars that in turn bolt to a chain ...

7. Screw mechanism - Wikipedia

   en.wikipedia.org/wiki/Screw_mechanism

   However, some screw mechanisms with a large enough pitch and good lubrication are not self-locking and will overhaul, and a very few, such as a push drill, use the screw in this "backwards" sense, applying axial force to the shaft to turn the screw. Other reasons for the screws to come loose are incorrect design of assembly and external forces ...