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2. Countersink - Wikipedia

   en.wikipedia.org/wiki/Countersink

   In manufacturing, a countersink (symbol: ⌵) is a conical hole cut into a manufactured object, or the cutter used to cut such a hole. A common use is to allow the head of a countersunk bolt , screw or rivet , when placed in the hole, to sit flush with or below the surface of the surrounding material (by comparison, a counterbore makes a flat ...

3. Drill bit - Wikipedia

   en.wikipedia.org/wiki/Drill_bit

   While the above is a common use of center drill bits, it is a technically incorrect practice and should not be considered for production use. The correct tool to start a traditionally drilled hole (a hole drilled by a high-speed steel (HSS) twist drill bit) is a spotting drill bit (or a spot drill bit, as they are referenced in the U.S.). The ...

4. Robertson screw - Wikipedia

   en.wikipedia.org/wiki/Robertson_screw

   Screwdriver bits in different sizes for Robertson screws. When Henry Ford tried the Robertson screws, he found that they saved considerable time in Model T production. When Robertson refused to license the design, Ford realized that the supply of screws would not be guaranteed, and chose to limit their use to his Canadian division. [4] [5] [6]

5. Counterbore - Wikipedia

   en.wikipedia.org/wiki/Counterbore

   Whereas a counterbore is a flat-bottomed enlargement of a smaller coaxial hole, a countersink is a conical enlargement of such. A spotface often takes the form of a very shallow counterbore. As mentioned above, the cutters that produce counterbores are often also called counterbores; sometimes, to avoid ambiguity, the term counterbore cutter is ...

6. Irwin Industrial Tools - Wikipedia

   en.wikipedia.org/wiki/Irwin_Industrial_Tools

   Previous logo. Irwin Industrial Tools is an American manufacturer and distributor of hand tools and power tool accessories. It is owned by Stanley Black & Decker.It is best known for producing Vise-Grip locking pliers.

7. Ace Hardware - Wikipedia

   en.wikipedia.org/wiki/Ace_Hardware

   Ace Hardware Malaysia currently has 22 branches nationwide as of January 1, 2022. [83] Ace Hardware Philippines Inc was founded in 1997, opening its first branch in the Philippines at SM Southmall in Metro Manila. [84] Currently, Ace Hardware has more than 100 branches all over the country. [85] [86] ACE Hardware is an affiliate of the SM Group ...