They can be seen in many —mainly military— jet engines. Do these bolts recibe an special name?
J79: the fasteners are everywhere
EJ200: they can be discerned in the rear flange
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12 point flange cap bolt/screw. For high torque applications, less likely to be accidentally rounded-off. http://www.fbabolt.com.au/12-point-advantages.html
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1$\begingroup$ They are also make from an extremely heat-resistant alloy, so their strength is retained at high temperatures. $\endgroup$ May 31, 2020 at 19:00
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$\begingroup$ I agree that the bolts in question are some variant of the 12 point flange cap bolt, but these bolts appear to be more specialised. I think there may be additional specifications, such as material, grade, and stretch rating. If you look at the shaft these appear to be a form of stretch bolt such as those used in connecting rod applications in piston engines. We may need to consult an engine IPC. $\endgroup$– J WJun 2, 2020 at 12:07