How hard is a Grade 5 bolt?

Commercial grade 5 sold by such as McMaster-Carr simply say Rockwell C hardness of 25 to 34 and a minimum tensile strength of 120,000 psi. 4140HT (also known as pre hard) would be in this general class and not require additional heat treat. It is also readily available.Click to see full answer. Subsequently, one may also ask, how strong is a Grade 5 bolt? Bolt Grade Markings and Strength Chart Head Marking Grade and Material Mechanical Properties Min. Tensile Strength (psi) 3 Radial Lines Grade 5 Medium carbon steel, quenched and tempered 120,000 105,000 6 Radial Lines Grade 8 Medium carbon alloy steel, quenched and tempered 150,000 Also Know, how strong is a Grade A bolt? Grade A – headed bolts, threaded rods and bent bolts with a minimum tensile strength of 60 ksi for a wide range of general-purpose applications. Grade B – heavy hex bolts and studs with a tensile strength of 60 to 100 ksi for flanged joints in piping systems with cast iron flanges. In respect to this, what is a Grade 5 bolt? Grade 5 Bolts and fasteners are made of medium strength carbon steel and are specified under the Society of Automotive Engineers (SAE). These bolts are heat treated in a controlled atmosphere from 1⁄4 in. through 1-1/2 in. with a minimum tensile strength of 120,000 psi in diameters through 1 in.Is a Grade 8 bolt stronger than a Grade 5 bolt? Grade 8 / Grade G Grade 8 bolts have been hardened more than grade 5 bolts. Thus they are stronger and are used in demanding applications such as automotive suspensions. Grade 8 bolts have 6 evenly spaced radial lines on the head.