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2. Countersink - Wikipedia

   en.wikipedia.org/wiki/Countersink

   A back countersink, also known as an inserted countersink, is a two piece countersink used on tough to reach areas. One component is a rod that is inserted into the existing hole in the workpieces; the other component is the cutter, which is attached to the rod, or extends out of it, after it is in position. [ 3 ]

3. John Pritzlaff Hardware Company - Wikipedia

   en.wikipedia.org/wiki/John_Pritzlaff_Hardware...

   Pritzlaff's enterprise became the largest hardware company in Milwaukee, Wisconsin [3] and eventually became one of the largest wholesale hardware companies and iron supply houses in the Midwest. [ 4 ] [ 5 ] It was known for selling hardware, sewing machines, and toys through mail order catalogs to wholesale accounts throughout the United States.

4. Piping and plumbing fitting - Wikipedia

   en.wikipedia.org/wiki/Piping_and_plumbing_fitting

   Steel pipe is often joined with threaded connections; tapered threads are cut into the end of the pipe, and sealant is applied in the form of thread-sealing compound or thread seal tape (also known as PTFE or Teflon tape) and the pipe is screwed into a threaded fitting with a pipe wrench. Threaded steel pipe is widely used in buildings to ...

5. Counterbore - Wikipedia

   en.wikipedia.org/wiki/Counterbore

   The uppermost counterbore tools shown in the image are the same device. The smaller top item is an insert, the middle shows another three-fluted counterbore insert, assembled in the holder. The shank of this holder is a Morse taper , although there are other machine tapers that are used in the industry.

6. Cutting tool (machining) - Wikipedia

   en.wikipedia.org/wiki/Cutting_tool_(machining)

   Rotary cutting tools include drill bits, countersinks and counterbores, taps and dies, reamers, and cold saw blades. Other cutting tools, such as bandsaw blades, hacksaw blades, and fly cutters, combine aspects of linear and rotary motion. The majority of these types of cutting tools are often made from HSS (High-Speed-Steel).

7. Cheater bar - Wikipedia

   en.wikipedia.org/wiki/Cheater_bar

   Cheater bars are usually used to free threaded pipe, screws, bolts, and other fasteners that are difficult to remove with a ratchet or pipe wrench alone. They are also commonly used to operate valves.