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Hello I’m in the Mechanical Engineering program at Forsyth Technical CC. I have a multi-screw head and square thread presentation and was trying to find any and all information on the following:
1) Clutch type A screw head
2) Multi-spline or Bristol screw head
3) Slab Head screw/bolt head
4) Phillips screw head
5) Square threads
Mainly I’m looking for pictures/history/ process of manufacturing/ purpose of each/ etc.
Any help would be greatly appreciated.
Sincerely,
Justin Burns
Hello Justin,
It would appear to me that what you are looking for is information on fastener drive systems. Whereas we here at Fastener Experts are good at solving particular challenges that fastener users have (i.e. what platings to use in specific environments; what fasteners to consider for a particular assembly requirement), your question is best answered by existing resources already on the Internet.
Let me help you get started:
A great overview of fasteners in general can be found at this Wikipedia page: http://en.wikipedia.org/wiki/Screw.
An excellent list of fastener drive types can be found at this Wikipedia page: http://en.wikipedia.org/wiki/List_of_screw_drives. On this page, I am seeing the drives you are looking into: Clutch, multi-Spline/Bristol, Phillips and Square. The only one missing seems to be the “Slab Head” and to be honest, I haven’t yet come across this one in 30 years in this field. However, this page seems to have an entry for a Slab Head and wouldn’t you know it, it looks just like it sounds: http://allied1.com/harper.htm.
Basically, between Google and Wikipedia, you’ll be able to find everything you need. If you need illustrations, you can find those on the Aspen Fasteners site.
Good luck with your studies over at Forsyth Technical (in North Carolina, right? Yeah, I googled your school!) and let us know if there is anything else that we can help you with.
What would be the force needed to shear a 5/16-18 diameter 18-8 stainless steel bolt?
We have published a paper titled “Stainless Steel and Stainless Steel Fasteners: Chemical, Physical and Mechanical Properties” that you can find by following this link:
http://www.aspenfasteners.com/v/vspfiles/files/docs/stainless_specification.pdf
I believe that the information you are looking for can be found on page 13, table 13.
If you need any further information, please do not hesitate to contact us.
On page 13, table 13 these is information about shear values.