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<blockquote data-quote="greybeard" data-source="post: 1360547" data-attributes="member: 18945"><p>Used to be according to my machinists class, but I can't remember what made it different from grade 2 or grade 5 tho I believe it was the material it was made from. It had 2 dashes on it-directly opposite each other. It is now considered an obsolete Grade. I want to say grade 3 was reserved for specialty solid bronze (not plated) bolts, but it's just been too long ago. There was also a Grade 1 and a Grade 6 bolt.</p><p><a href="https://sizes.com/tools/bolts_inch_grades.htm" target="_blank">https://sizes.com/tools/bolts_inch_grades.htm</a></p></blockquote><p></p>
[QUOTE="greybeard, post: 1360547, member: 18945"] Used to be according to my machinists class, but I can't remember what made it different from grade 2 or grade 5 tho I believe it was the material it was made from. It had 2 dashes on it-directly opposite each other. It is now considered an obsolete Grade. I want to say grade 3 was reserved for specialty solid bronze (not plated) bolts, but it's just been too long ago. There was also a Grade 1 and a Grade 6 bolt. [url=https://sizes.com/tools/bolts_inch_grades.htm]https://sizes.com/tools/bolts_inch_grades.htm[/url] [/QUOTE]
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