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Most often, bolts used in machinery are made to SAE standard J429, and bolts used in structures are made to various ASTM standards. The tables below give the head markings and some of the most commonly-needed information concerning the bolts.
24 paź 2014 · Three radial lines will indicate an SAE grade 5 fastener, while six radial lines will indicate an SAE grade 8 fastener. These are the most common grades, but there are others. Our Fastener Identification Markings Chart has a complete list of bolt grades with accompanying head markings.
This chart helps to identify the grades of bolts using the identification marks on the bolt's head along with the strength and hardness of common grade bolts. Please note the bolt heads may also include the manufacturer's identification stamp, especially with high strength bolts. Grade 8 - SAE J429. Grade 8.2 - SAE J429.
10 kwi 2021 · Let’s walk through how to decipher metric bolt and screw grades, plus their head markings, using one ISO standard and its following property classes as examples: ISO 898-1 Property Class 8.8 Metric Bolt and Screw Head Marking
26 wrz 2023 · METRIC HEX BOLTS AND SETS . The 3 main popular strength levels that are used in the industry for metric hexagon fasteners – bolts being part threaded and setscrews fully threaded – are Grade 8.8 (often referred to as high tensile), Grade 10.9 and Grade 12.9. You will see from the images that there are also letters which denotes the ...
2 sie 2023 · Grade 8 bolts are made of medium-strength carbon or alloy steel and can be finished in a variety of coatings and platings for added corrosion resistance and lubricity. You can identify a Grade 8 bolt by looking at its head markings. An SAE J429 Grade 8 bolt’s head marking will show six radial lines like this:
The following are the standard head markings for both metric and imperial fasteners. Note : When a thick protective coating is applied to a bolt of grade 8.8 or 10.9, which requires the nut thread to be overtapped, the next higher grade of nut should be used.
