Yes, they are one-time-use safety bolts. The head will snap off at the proper torque.
as already suggested a Dremel with a cut off wheel to create a slotted bolt head is the easiest solution. Or get a very sharply pointed center punch, and gently tap the bolt head in the proper CCW direction.
or get a small drill, and the proper size easy out to remove the bolt in that manner
replacement bolts are not necessary. A slotted bolt stub will work just fine. Hex head bolts will not fit but a socket head cap screw performs just fine.
Larry
