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2. Washer (hardware) - Wikipedia

   en.wikipedia.org/wiki/Washer_(hardware)

   A plain washer and a spring washer are placed on a bolt between the nut (on the threaded end) and the bolt head. The American National Standards Institute (ANSI) provides standards for general use flat washers. Type A is a series of steel washers at broad tolerances, where precision is not critical.

3. Bolt (fastener) - Wikipedia

   en.wikipedia.org/wiki/Bolt_(fastener)

   Bolts use a wide variety of head designs, as do screws. These are designed to engage with the tool used to tighten them. Some bolt heads instead lock the bolt in place, so that it does not move and a tool is only needed for the nut end. Common bolt heads include hex, slotted hex washer, and socket cap.

4. List of screw and bolt types - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_and_bolt_types

   A special type of bolt that is set into concrete, with screw threads protruding above the concrete surface to accept a nut. breakaway bolt: A breakaway bolt is a bolt with a hollow threaded shank, which is designed to break away upon impact. Typically used to fasten fire hydrants, so they will break away when hit by a car. Also used in aircraft ...

5. Fastener - Wikipedia

   en.wikipedia.org/wiki/Fastener

   Structural bolt DIN 6914 with DIN 6916 washer and UNI 5587 nut. A threaded fastener has internal or external screw threads. [7] The most common types are the screw, nut and bolt, possibly involving washers. Other more specialized types of threaded fasteners include captive threaded fasteners, stud, threaded inserts, and threaded rods.

6. Nut (hardware) - Wikipedia

   en.wikipedia.org/wiki/Nut_(hardware)

   Sex bolt: Barrel nut, barrel bolt, binding barrel, Chicago screw, post and screw or connector bolt Has a barrel-shaped flange and protruding boss that is internally threaded Split nut: Split lengthwise into two pieces (opposed halves) so that its female thread may be opened and closed over the male thread of a bolt or leadscrew Sleeve nut ...

7. Bolted joint - Wikipedia

   en.wikipedia.org/wiki/Bolted_joint

   Finally, dynamic friction prevails and the torque is distributed in a 50/40/10 % manner as the bolt is tensioned. The torque value is dependent on the friction produced in the threads and under the torqued bolt head or nut and the fastened material or washer if used.

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9. Direct tension indicator - Wikipedia

   en.wikipedia.org/wiki/Direct_tension_indicator

   Regarding the ASTM F959 manufacturing specification, the abstract from the ASTM website describe DTIs as "capable of indicating the achievement of a specified minimum bolt tension in a structural bolt and are intended for installation under either a bolt head or a hardened washer.