In a partially or fully annealed condition, the tensile strength of the 8.8 Hex Bolt is around 420 Mpa for low carbon steel and 500 Mpa for medium carbon steel, its core hardness in terms of where e2 is the distance between the center of the edge bolt and the end of the plate measured perpendicular to the load transfer direction, p2 is the distance between the centers of neighboring bolts measured perpendicular to the load transfer direction, and d0 is the diameter of the bolt hole. ps is the shear strength of the bolt In the table, As has been taken as equal to At . Engineering Standards Feedback Advertising For typical coarse pitch thread bolts the standard sizes are: M3, M3.5, M4, M5, M6, M7, M8, M10, M12, M14, M16, M18, M20, M22, M24, M27, M30, M33, M36, M39. The most common SAE bolt grades are Grade 2, Grade 5, and Grade 8. Friction Formulas Apps Under torqued bolts can quickly come loose, and over-torqued bolts are liable to break. According to ISO 898-1 the bolts are characterized depending on their pitch thread: The nominal diameter d is specified in mm as part of the bolt designation, e.g. Materials and Specifications The wet column indicates lubricated bolts, whereas the dry column indicated unlubricated bolts. All rights reservedDisclaimer | For those reasons, these are the bolts often used in military and aerospace applications. If oversize or short slotted holes are used, bearing values should be multiplied by 0.7. (Black): Bearing > Single Shear; Grade 8 bolts are manufactured in different materials, thread types, lengths, coatings, and classes of fit, so it is critical that all those factors are taken into account when choosing the type of Grade 8 bolt is best. Thus, for the bolt of property class 8,8 in the above example a nut of property class 8 is required. In comparison, a Grade 5 bolt is weaker as its tensile is 120 ksi, placing it at 120,000 lbs. | Contact, Home The grade 8.8 can also be defined as the medium carbon steel specification for bolts. There are three grades within this specification, 36, 55, or 105. Your email address will not be published. Finishing and Plating Civil Engineering Electronics Instrumentation Very few applications outside of industry require higher than a Grade 8 bolt. They have a proof load of 85000 psi, minimum yield strength of 92000 psi, and a minimum tensile strength of 120000 psi. Applied.com. We use cookies to deliver the best possible user experience and to collect anonymous statistical data about our web traffic. Note: Manufacturer's identification mark are also stamped when applicable. They are durable, strong, and can resist a heavy amount of stress. See the latest inventory on Grade 8 Bolts currently available by looking through the online catalog. GRADE 8. Privacy Policy | 1/4 thru 1-1/2. Excel App. Heat Transfer