Grade 9 steel hex head screws are marked with nine radial lines. When looking at the head of a bolt, there are six details that can be told by them: the type of fastener (or drive type), the grade (or classification) of the fastener, the manufacturer, the material type, the plating or coating and whether it is an Imperial fastener or a Metric fastener. E.G. Original masks graciously replaced by Kent Bissett @ Dandeno .. Made in the USA. Metric Bolts: Head Marking Class and Material Nominal Size Range (mm) Mechanical …
BOLT, M12 X 1.25 X 60MM, GRADE 10.9, HEX HEAD, BLACK quantity. However, the head does usually have nine dots or lines upon them. According to Imperial (SAE) and Metric specifications, as the grade and class of the fasteners increase, so do that of the bolt’s tensile strength. For technical drawings and 3 … The Grade 9 Bolting system develops the highest clamp force available in a standard bolt/nut assembly and it is frequently referred to by one of the folowing trade names: L9, PFC9, or F911.
A Grade 9 (or L9) bolt generally doesn’t have an industry standard in specification of its head marking and therefore the design is solely up to the manfuacturer. The Grade 9 Bolting system develops the highest clamp force available in a standard bolt/nut assembly and it is This type of bolt is design for use within high-stress and high-strength applications. A Grade 8 bolt can be identified by the six lines. If you are looking for durability and reliability make sure you ask for Hobson. Based on search filters applied, no results found. One advantage cap screw fasteners have over welds or rivets is that they allow for easy disassembly for repairs and maintenance. A Grade 5 bolt can be identified by the three lines. Length is measured from under the head. However, it seems JavaScript is either disabled or not supported by your browser. The tensile strength can easily be converted between both types of thread pitch by recalling that a Grade 2 bolt possesses the same tensile strength as a Class 4.6 bolt, a Grade 5 bolt possessing the same tensile strength as a Class 8.8 bolt, a Grade 8 bolt possesses the same tensile strength as a Class 10.9 bolt and a Grade 9 bolt possesses the same tensile strength as a Class 12.9 bolt.
A Class 8.8 bolt can be identified simply by the numbers 8.8 on it. The important thing to keep in mind is correctly assessing the type of bolt for the job at hand.
A class 8.8 bolt, a class 10.9 bolt and a class 12.9 bolt are clearly marked as such. Grade 9 -- Yellow Zinc Chromate -- 180,000 PSI. Graded bolts are generally Imperially sized and possess an Imperial thread pitch (TPI – Threads Per Inch), whilst a Metric bolts are generally rated in Classes and possess a Metric thread pitch. A grade five bolt will have three lines upon it, add two to that number and you have a grade of five and so on. Grainger has the hex head cap screws, nuts, washers and other fasteners you need for machine maintenance and general construction. Grade 9 Plow Bolts & Grade 8 Hex Nuts: Hobson Plow bolts and Nuts are manufactured to strict Hobson specifications. The basic rule of thumb in determining the grade is to count the number of lines on head of the bolt and add two to that number. The hex head cap screw is a common fastener in construction and machine assembly.
Note: Product availability is real-time basis and adjusted continuously. The screw head is designed to fit a ratchet or spanner torque wrenches allowing you to tighten the screw to your exact specifications. Sign In to access your account information. As you increase the tensile strength of the bolt, increasing it’s stretching capabilities with each grade, the material of the bolt is increasingly more brittle and prone to side-ways pressures. Grade 8 screws provide high tensile strength.