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2. 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 ...

3. ASTM F568M - Wikipedia

   en.wikipedia.org/wiki/ASTM_F568M

   ASTM F568M is an ASTM International standard for metric bolts, screws and studs that are used in general engineering applications. It is titled: Standard Specification for Carbon and Alloy Steel Externally Threaded Metric Fasteners. It defines mechanical properties for fasteners that range from M1.6 to 100 in diameter.

4. Steel grades - Wikipedia

   en.wikipedia.org/wiki/Steel_grades

   High Tensile Strength Flat products: ... In addition to the descriptive steel grade naming system indicated above, within EN 10027-2 is defined a system for creating ...

5. Zinc flake coating - Wikipedia

   en.wikipedia.org/wiki/Zinc_flake_coating

   High-strength steel parts (such as bolts of strength category > 10.9 and nuts of > 9) and components with tensile strength of > 1000 N/mm 2 or > 320 HV are susceptible to hydrogen embrittlement. Galvanic coating processes and pickling with acids have a major influence on the development of hydrogen-induced brittle fractures.

6. Screw - Wikipedia

   en.wikipedia.org/wiki/Screw

   High-strength steel bolts have property class 8.8, which is 800 MPa ultimate strength and 0.8*800=640 MPa yield strength or above. The same type of screw or bolt can be made in many different grades of material. For critical high-tensile-strength applications, low-grade bolts may fail, resulting in damage or injury.

7. Bolt (fastener) - Wikipedia

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

   A bolt is an externally helical threaded fastener capable of being tightened ... (grade 2,5,8) - the level of ... standard for bolts 1 ⁄ 2 to 1 + 1 ⁄ 2 inches (12 ...