Right,you can't get A4/80-non in the country!!You can get A2/70-80.A4 is marine(nothing to do with the strength!!).So,a2 70-80 it is!!Here is some reading:
If Stainless isn’t as strong as high tensile steel is it going to be strong enough?
This is our MOST faq. Firstly it should be made clear that if for whatever reason you require high tensile (HT) bolts you should use original equipment. Secondly if we believed a bolt was not strong enough for a particular application we would not sell it to you. HT steel is used by factories because it is cheap, convenient and saves assembly time. We ran a motorcycle fitted with standard A2 bolts on discs and fork castings etc which were tested on a daily basis for many months and found no problems whatsoever. Not really a surprise when you consider both the hub and the yokes are low tensile cast alloy - the threads on the fastener are actually stronger than the threads in the material. If you need further reassurance - in the seven years we have been selling stainless we have not had a report of a single failure because the bolt wasn’t strong enough.
A2 Class 70-80 (BS970 bar & hexagon equivalents T303/T304)
The 'A2' denotes the alloy type. A2 is often referred to as 18/8 (18% Chrome/8% Nickel) or Type 304. This is the most common form of stainless steel fastener fabrication, it offers excellent general corrosion resistance and is the minimum specifcation we supply. Class 70-80 refers to the strength range. There are two strength ranges available, Class 60 and 70-80. Unlike some of our competition we sell only fasteners made from the higher strength range.
A4 Class 70-80 (BS970 bar & hexagon equivalents T316)
A4 is also referred to as 18/10/3 (2% extra Nickel added 3% molybdenum) or Type316. This is regarded by specifiers as 'marine grade' or 'enhanced corrosion resistant' stainless and is designed for constant immersion in salt water or 'stronger' acids.
I have had to bulk order these(3 sets) so if anyone wants 8.let me know(Yes Rob,your first!!)