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2. List of screw drives - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_drives

   1 ⁄ 8: 3.2: 2 5 ⁄ 32: 4.0: 3 3 ⁄ 16: 4.8: 4–5 ... is a high-security fastener whose head breaks off during installation, during or immediately after the ...

3. High-speed steel - Wikipedia

   en.wikipedia.org/wiki/High-speed_steel

   Heavier machine tools with higher rigidity were needed to use the new steel to its full advantage, prompting redesigns and replacement of installed plant machinery. The patent was contested and eventually nullified. [7] The first alloy that was formally classified as high-speed steel is known by the AISI designation T1, which was introduced in ...

4. Tool steel - Wikipedia

   en.wikipedia.org/wiki/Tool_steel

   Tool steel is any of various carbon steels and alloy steels that are particularly well-suited to be made into tools and tooling, including cutting tools, dies, hand tools, knives, and others. Their suitability comes from their distinctive hardness , resistance to abrasion and deformation, and their ability to hold a cutting edge at elevated ...

5. GM Ecotec engine - Wikipedia

   en.wikipedia.org/wiki/GM_Ecotec_engine

   The GM Ecotec engine, also known by its codename L850, is a family of all-aluminium inline-four engines, displacing between 1.2 and 2.5 litres.Confusingly, the Ecotec name was also applied to both the Buick V6 Engine when used in Holden Vehicles, as well as the final DOHC derivatives of the previous GM Family II engine; the architecture was substantially re-engineered for this new Ecotec ...

6. Hemispherical combustion chamber - Wikipedia

   en.wikipedia.org/wiki/Hemispherical_combustion...

   A hemispherical head ("hemi-head") gives an efficient combustion chamber with minimal heat loss to the head, and allows for two large valves.However, a hemi-head usually allows no more than two valves per cylinder due to the difficulty in arranging the valve gear for four valves at diverging angles, and these large valves are necessarily heavier than those in a multi-valve engine of similar ...

7. Chrysler 2.2 & 2.5 engine - Wikipedia

   en.wikipedia.org/wiki/Chrysler_2.2_&_2.5_engine

   The first version of this engine family was a normally aspirated 2.2 L (134 cu in) unit. Developed under the leadership of Chief Engineer – Engine Design and Development Willem Weertman and head of performance tuning Charles "Pete" Hagenbuch, who had worked on most of Chrysler's V-8 engines and the Chrysler Slant-6 engine, [1] it was introduced in the 1981 Dodge Aries, Dodge Omni, Plymouth ...