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Hex bolts have a chamfered point to aid insertion into a tapped hole or nut. Length is measured from under the head.
Grade 8 fasteners are made of medium-carbon alloy steel that is quenched and tempered for added strength, with 120,000-130,000 PSI proof load and 150,000 PSI tensile strength. They have superior hardness for usage in applications where strength is a primary concern, and are grade-marked on the head with six radial lines. Yellow Zinc Chromate fasteners have been coated with zinc and with yellow chromate. As a result they offer corrosion resistance that is slightly higher than clear zinc.
Hex head fasteners can be driven with simple wrenches, and require minimal clearance above the fastener because they can be driven or loosened from the side.
A threaded fastener's size name includes information about the major external diameter, followed by the threads per inch, which indicates if it is coarse or fine.
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