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Grade 5 Hex Head Cap Screws

The most typical industrial HHCS is a Grade 5, which is indicated by 3 radial lines on the head of the fastener. These are found in many things like; automobiles, engines, boats, oil refineries, housing, contracting, etc. Grade 5 is an excellent choice for so many applications because it has a strong tensile and shear strength where most of these applications fall into, it also resists corrosion well and most commonly comes in a plain zinc (aka: clear zinc) plating, but can also have other finishes as well. It is stronger than stainless steel bolts like SS304 or SS316 in regards to tensile strength, but weaker than grade 8 bolting. It is similar to the Metric class 8.8 in strength. This fastener is great when considering strength-per-cost and the extensive size range. Used with a wrench or socket in threaded holes, or with a lockwasher/flatwasher and hex nut. (~120,000psi minimum tensile strength)

Grade 5 Hex Head Cap Screws

A carriage bolt, coach bolt or round head square neck bolt is a form of bolt. It is distinguished from other bolts by its head: the shank of the bolt is circular for most of its length, as usual, but the portion immediately beneath the head is formed into a square section.