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  2. ASTM A325 - Wikipedia

    en.wikipedia.org/wiki/ASTM_A325

    ASTM A325 is an ASTM International standard for heavy hex structural bolts, titled Standard Specification for Structural Bolts, Steel, Heat Treated, 120/105 ksi Minimum Tensile Strength. It defines mechanical properties for bolts that range from 1 ⁄ 2 to 1 + 1 ⁄ 2 inches (13 to 38 mm) in diameter. [1]

  3. List of thread standards - Wikipedia

    en.wikipedia.org/wiki/List_of_thread_standards

    A screw thread, often shortened to thread, is a helical structure used to convert between rotational and linear movement or force. A screw thread is an inclined plane wrapped around a cylinder or cone in the form of a helix, with the former being called a straight thread and the latter called a tapered thread.

  4. Research Council on Structural Connections - Wikipedia

    en.wikipedia.org/wiki/Research_Council_on...

    At that time, high-strength structural steel rivets were common in buildings and bridges, but bolts were expected to be safer, quicker, and more economical if technical equivalence could be demonstrated. The council's first Specification [3] identified ASTM A325 bolts as one-to-one replacements for ASTM A141 rivets. [4]

  5. ASTM A490 - Wikipedia

    en.wikipedia.org/wiki/ASTM_A490

    ASTM A490 and ASTM A490M are ASTM International standards for heavy hex structural bolts made from alloy steel.The imperial standard is officially titled Standard Specification for Structural Bolts, Alloy Steel, Heat Treated, 150 ksi Minimum Tensile Strength, while the metric standard (M) is titled Standard Specification for High-Strength Steel Bolts, Classes 10.9 and 10.9.3, for Structural ...

  6. Unified Thread Standard - Wikipedia

    en.wikipedia.org/wiki/Unified_Thread_Standard

    The thread form is slightly modified to increase the minor diameter, and thus the strength of screws and taps. The major diameter still extends to within ⁠ 1 / 8 ⁠ H of the theoretical sharp V , but the total depth of the thread is reduced 4% from ⁠ 5 / 8 ⁠ H = ⁠ 5 / 8 ⁠ cos(30°) P ≈ 0.541 P to 0.52 P .

  7. A Cold War-era bomb shelter in Florida has new owners. What's ...

    www.aol.com/cold-war-era-bomb-shelter-100924902.html

    The one-story, nearly-8,000-square-foot fortification is bulwarked by concrete walls 30 inches thick. The two exterior entrances have armored steel blast doors — one paired with a radiation ...

  8. Reaching the College Football Playoff is a lucrative business ...

    www.aol.com/sports/reaching-college-football...

    The inaugural 12-team College Football Playoff (CFP) is officially here. Once seen as a complicated process that included math equations and plenty of disagreements, college football’s ...

  9. US Energy Department identifies three priority regions for ...

    www.aol.com/news/us-energy-department-identifies...

    The DOE has narrowed down an initial list of national interest corridors to three from 10. The designation would allow the federal government to expedite the development of grid expansion projects.