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2. ISO 898 - Wikipedia

   en.wikipedia.org/wiki/ISO_898

   ISO 898 is an international standard that defines mechanical and physical properties for metric fasteners.This standard is the origin for other standards that define properties for similar metric fasteners, such as SAE J1199 and ASTM F568M. [1]

3. ASTM F568M - Wikipedia

   en.wikipedia.org/wiki/ASTM_F568M

   This standard defines property classes, the metric equivalent of a screw grade, that are almost identical to those defined by ISO 898-1, [2] except for the addition of the 8.8.3 and 10.9.3 classes. These two additional standards are fasteners that have the same mechanical properties as their base property class (i.e. 8.8 and 10.9), but are made ...

4. 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 ...

5. Screw - Wikipedia

   en.wikipedia.org/wiki/Screw

   For example, a property class 5.8 bolt has a nominal (minimum) ultimate tensile strength of 500 MPa, and a tensile yield strength of 0.8 times ultimate tensile strength or 0.8 (500) = 400 MPa. Ultimate tensile strength is the tensile stress at which the bolt fails.

6. List of screw drives - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_drives

   Spline drives were specified for 5, 6.3, 8, 10, 12, 14, 16, and 20 mm size screws. [84] Its primary advantage is its ability to resist cam-out , so it is used in high-torque applications, such as tamper-proof lug nuts , cylinder head bolts, and other engine bolts.

7. Zinc flake coating - Wikipedia

   en.wikipedia.org/wiki/Zinc_flake_coating

   Because electrolytically zinc-plated surfaces provide comparatively little corrosion protection, and in the case of galvanic zinc coatings on high-strength steel (e.g. category 10.9 and 12.9 high-strength bolts) there is a risk of hydrogen embrittlement, the industry needed a better corrosion protection system.