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MessagePosté le: Mer 22 Aoû - 11:42 (2018)    Sujet du message: Répondre en citant

A good automotive technician must know many things about Detroit fasteners (nuts and bolts) Scott Hartnell Predators Jersey , the different methods of repairing them when they break, and how not to break them. This chapter deals with these parts and procedures. A bolt is an externally threaded fastener that is used with a nut. When it is used without a nut in a threaded or blind hole application to hold components together, it is known as a cap screw. During manufacturing, screw threads are either rolled or cut. Rolled screw threads are larger than the shank of the bolt (the area between the thread and the head of the bolt). To determine the size of a fastener, measure the screw thread. Standard threads come in both coarse and fine threads. The fine thread is called national fine; the coarse thread is national coarse. These are classified Craig Smith Predators Jersey , respectively, as UNF and UNC. The "U" stands for unified; it means that the thread interchanges with British threads. A UNF thread callout for a W diameter thread would be % x 24. It would have 24 threads per inch. A UNC would be % x 16. It would have 16 threads per inch.

Metric screw threads are also coarse or fine. The last number in the callout represents the thread pitch in millimeters. It is different from the threads per inch in the unified system. With metric screw threads, the thread pitch is the distance between threads in millimeters. This varies between 1.0 and 2.0 and depends on the diameter of the fastener. If the thread pitch is 1.0 this means there is 1 mm between each screw thread. An 8 mm fine thread could be either 8 x 1.0 or 8 x 1.25; a coarse thread would be 8 x 1.5. Notice that the lower pitch number denotes a finer thread.

Several different kinds of Detroit fasteners are used in automobiles. They are selected according to purpose and price. Fasteners are made of different types and grades of metals, and some are hardened. To toughen, or temper Mattias Ekholm Predators Jersey , a metal, it is heated to a specific temperature and then quenched. To soften, or anneal, a metal, it is heated and allowed to cool slowly. Bolts can be broken or damaged by over tightening Colton Sissons Predators Jersey , bottoming out, or being forced into a thread that does not match. When a bolt is properly tensioned it will be "spring loaded" against the part it is fastening. Bolts are purposely stretched like this to provide clamping force or “spring tension" on the parts being held together. Usually a bolt is stretched to 70% of its elastic limit when properly tightened. The elastic limit of a fastener is reached when it will no longer return to its original shape when loosened. A torque wrench is used to tighten fasteners to a specified tension.

DAMASCUS, Jan. 7 (Xinhua) -- The Syrian army managed on Sunday to make the first breach into the siege imposed by ultra-radical rebels on a strategic military base in the eastern countryside of the capital Damascus, pro-government al-Ekhbaria TV reported.

The Syrian army broke the siege imposed on the Vehicle Management base in the northeastern city of Harasta in the Eastern Ghouta region of Damascus, according to the report.

The achievement came following a days-long military campaign to break the siege imposed by the al-Qaida-linked Levant Liberation Committee (LLC) and like-minded groups on that key base.

Late last month Samuel Girard Womens Jersey , the LLC militants waged a major offensive in Harasta to capture the strategic base, managing to lay a siege on the facility and capturing surrounding buildings.

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On Jan. 5, the Syrian Observatory for Human Rights monitor group said that 77 rebels were killed during the week-long battles in Harasta.

The UK-based watchdog group added that 79 civilians have so far been killed in the battles there.

BEIJING, Jan. 9 (Xinhua) -- China's romantic comedy "The Ex-file: The Return of the Exes" is the first weekly champion of China's box office chart in 2018, according to China Film News.

The love story raked in over 1 billion yuan (150 million U.S. dollars) in the first week of 2018 Roman Josi Womens Jersey , with a total box office revenue of nearly 1.3 billion yuan since hitting Chinese screens on Dec. 29.

Hollywood blockbuster "Star Wars: The Last Jedi," released in China last Friday, came second, earning 186 million yuan in its debut week.

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Fourth place goes to another comedy "Gold Buster Viktor Arvidsson Womens Jersey ," which earned 100million yuan last week.

Rounding out the top five was fantasy film "Hanson and the Beast," which grossed 266 million yuan since its release on Dec. 29.

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MessagePosté le: Mer 22 Aoû - 11:42 (2018)    Sujet du message: Publicité

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