Rick6a
Well Known Member
Labeling a NAS1097 rivet as an "oops" rivet may be a convenient soundbite directed at the amateur builder trying to fill a wallowed out hole but like all soundbites the folksy little term "oops" also serves to undermine the true value of this type rivet. The NAS1097 is available in diameters at least up to AD6 (that I am aware of) and has been used in aerospace production work for a long, long time. By far, it is most commonly used for routine nutplate attachment. Why Van's has never encouraged this useful application has always been something of a mystery to me. You can easily 100° countersink thin .025 material without risk of generating the dreaded "knife edge." Seems to me that altering a nutplate with dimples is crude compared to simply using a NAS1097AD3 in the first place. The images below are only partial examples of situations where I found the NAS1097AD3 to be a useful, even desirable alternative to machining a standard size countersink.