Issues with the marking and standards of cylindrical head hex bolts?
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It is a cylindrical head hex bolt with high strength; the outer diameter of its threads is 15.80 mm, and the thread angle is 55 degrees. The bolt length is 2 inches. There are 11 teeth per inch. How should it be indicated on the purchase order? Is it imperial thread? What are the bolt standards? What reference books do people usually use? What are the standards for British and American bolts? I’ve been confused by these lately; thank you all.
The most commonly used one is the mechanical design handbook, as it contains quite comprehensive information.
In the imperial system, the code is 5/8\"; there’s no standard designation for it. When purchasing, simply specify the length. It’s likely that such a product won’t be available. If the quantity needed is small, it’s better to have a design created first
The outer diameter of the thread is 15.80 mm, and the thread angle is 55 degrees. The bolt length is 2 inches. There are 11 teeth per inch. Standard GB70 (DIN791) specification 5/8"-11*2"
Just follow the standards; see if this is helpful to you. GB-T5783-2000: Hex head bolts, fully threaded. I’m not able to upload the documents yet, but I can send them to you if you need them. This post was last edited by wisdom1010 on 2009-3-23 at 09:45
How is the high strength indicated on the original bolts? It’s 9.8, 10.9, 12.9, etc
I found it: http://bbs.hcbbs.com/viewthread.php?action=printable&tid=176568. I hope it’s useful to you! :handshake