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thread367-175504 I have just read the old & closed thread (see reference) regarding casting a Wrought Aluminium Alloy (7075). Indeed it can be cast, but with the direct squeezecasting process. This is what we have been doing for many years. All of the Aluminium wheels on the British Army Warrior...

I have been helped enourmously from previous thread based around this problem. Basically, I have moved from a pan head taptite to a C'sk taptite to bolt a steel member to an Aluminium casting ( blind hole). I have a critical customer complaint now because the only "off the shelf" C'sk tatptite...

I am being challenged by our customer that where I have used C'sk taptite screws to bolt a steel ring on to an Aluminium casting will be more prone to vibration loosening problems than a previous similar joint bolted by pan head taptites. Could any one support or reject this claim Many thanks

Thanks Kyle, On a previous design we have used Torx taptites, However for this design I would rather not have to deal with the bolt head & its size. The pilot hole shown is not part of the casting & can be omitted. Could you expand or point me to info regarding the drive rivet pease?. Can...

Attached is a drawing showing a metal ring to be fastened to an aluminium casting. I have put a pilot hole in the aluminium casting, but this does neet to be there. I need an efficient way of fastening the steel ring. Can a drive rivet be used in this situation? Thanks Clive

I am back again, with a slightly different query. The Taptite C'sk screws I have chosen only seem to come zinc plated ( susceptable to hydrogen embritlement). These screws are to be used in an outside aggressive environment on land and in water ( including the sea). I am guessing that this...

Thanks everyone. I looked at the Camcar catalogue & the thread size is limited to M^. I need M8. Thanks again

Thanks Screwman. I have unable to locate a vendor of 10.9 C'sk taptites with M8 thread. We need a good screwing recess like allen key hex or Torx. If you know of anyone, I would be extremely grateful if you could let me know a contact. Thanks

Thanks for all the replies.They have been extremely useful. I have now found out that the particular "taptite" fastener only comes in 8.8 quality. The bolts are bolting a steel ring to an aluminium substrate. Previously bolts were 10.9. I assume I am going to reduce my clamping load due to the...

Thanks for the information. Does this mean that generally that my C'sk bolt, as long as the grade of material is the same, will perform as well as the std. headed bolt I am replacing? Thanks Clive

Just wanted to know what are the considerations in changing from a regular head bolt to a C'sk head bolt in terms of the stress it can withstand & hence induced load. I am having to consider a C'sk due to reduced head height, and are using the same thread ( M8). Thanks Clive